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Fillers: product lines reviewed.

SUZORITE MICA SUB. OF CORONA CORP.

Suzorite-brand mica reportedly gives good flexural strength, heat-distortion resistance, high modulus of elasticity, and resistance to weathering, corrosion, high temperatures, warping, and electricity. It is available in grades ranging from fine powders to highly delaminated and coated flake, and can be injection molded, sprayed, and rolled. Surface-treated grades are available under the trademark Suzorex.

Suzorite E-Mica is an electroconductive mica produced by ABRASIVE MACHINE & SUPPLY CO.

Glass bead fillers are available for increasing mechanical and dielectric strength. Fillers can be supplied coated with resin.

ADELL PLASTICS, INC.

Offers custom compounds of filler concentrates up to 75% filler in all thermoplastics. Multifunctional concentrates containing more than one type of additive are also available.

AGRASHELL, INC.

Supplies walnut-shell flours for use as low-density filler in phenolics and cast polyesters. Standard grades (WF-5, -200 mesh; and WF-7, -325 mesh) are light in color, free-flowing, nontoxic, low in resin demand and easily dispersed.

AKROCHEM CORP.

Akrochem products include calcium carbonates, kaolin clays, alumina trihydrates, wood and fiber flocks, wood flours, micas, magnesium carbonates, and precipitated amorphous silica.

ALLIED CUSTOM GYPSUM

Supplies gypsum as a flame-retardant filler. (See also Flame Retardants.)

ALLIED PRODUCTS CORP.

See Coz Div.

ALUCHEM INC.

Offers a wide variety of ground hydrated alumina, calcium carbonate, and magnesium oxide fillers.

Four independent milling systems enable the company to produce 21 particle-size distributions ranging from 65% to 100% minus 325 mesh with median particle sizes of 4 to 30 microns. Specialty "super-fine" ground fillers, with a median particle size of 1.5 microns and a top-size of less than 10 microns, are also available. Twelve grades of hydrated alumina/calcium carbonate blends are also offered.

Company's ACM-MH 93 magnesium hydroxide serves as a flame-retardant filler, releasing water of hydration like alumina trihydrate, but is able to withstand processing temperatures up to 625 F vs. 425-445 F for ATH. It's available in 7-micron and 3-micron grinds with or without surface treatment.

AMERICAN METAL FIBERS, INC.

Stainless-steel, low-carbon-steel and brass fibers, chopped from metallic wools, serve as conductive fillers for EMI shielding and as reinforcements. Fiber diameters range from 30 to 150 microns with lengths from 1 to 3 mm.

AMERICAN WOOD FIBERS

Manufactures hardwood and softwood flour, which is low in density and has a particle size of 20-200 mesh. The wood flour is scientifically processed in bulk or bagged form. Company operates several plants throughout the U.S.

BAKER RUBBER INC.

Company says it's the largest producer of ground rubber in the U.S., recycling car and truck tires into materials that can be used to modify plastics. Granulite products come in a variety of particle sizes down to minus 40 mesh and priced in a range of 12-20/lb. They can be used as flexibilizers, anti-skid additives, extenders, and potentially as impact modifiers. Baker also plans to introduce pelletized masterbatches of ground rubber in a thermoplastic vehicle.

BASIC CHEMICALS

Company offers magnesium oxide and magnesium carbonate.

BEKAERT STEEL WIRE CORP.

Beki-Shield fibers are produced from extremely fine stainless-steel wire and are useful where electrical conductivity, EMI/RFI shielding, and static dissipation are required. Product is said to be more conductive than competitive additives, so that it may be used in smaller amounts. It reportedly provides good EMI shielding without significantly affecting the mechanical properties of the compound. It is available as slivers (chopped fiber bundles with no twist), continuous roving, yarn, blended yarn (textile fiber blended with metal fibers), and chopped fibers (packages of parallel cut fibers held together by an adhesive that will dissolve during compounding). Any of these products can be treated with an appropriate sizing.

Beki-Shield GR products are chopped fibers sized with resin-specific sizings. Beki-Shield VK products are continuous-filament tow of various diameter sizes and filaments per two for weaving and long-fiber processing.

BURGESS PIGMENT CO.

Offers hydrous, anhydrous, and thermo-optic aluminum silicates (clays) designed as brightening agents and fillers. They are recommended as replacements and extenders for costly white pigments in compounds for insulating, extrusion, and floor covering.

Icecap K, Iceberg, and No. 30 are said to provide high electrical resistance, excellent processing, low moisture absorption, uniform color, and improved resistance to alkalis and acids. Company reports that its Tisyn provides the maximum opacity available from thermo-optic pigments.

Most of the company's pigments can be surface-treated with silanes to improve properties in specific systems. KE, for example, is said to give excellent wet and dry electrical characteristics in crosslinked PE and polyester.

BURNS & RUSSELL CO. SPECIALTY CHEMICALS DIV.

Offers low-cost, medium-to-large particle-size surface-modified silicas. Company's F-40 (40-50 mesh), F-200 (70-75 mesh), F-400 (42-45 mesh) silicas permit exceptionally high loadings in a wide array of systems without severe loss of physical or chemical properties. Properties such as stain and abrasion resistance and weatherability are improved.

F-Series silica fillers are compatible with a broad range of polymeric applications, including backup layers, gel coats, epoxy flooring, and other thermoplastic and thermoset systems. In epoxy and polyester systems, F-40 and F-200 can replace up to 75% of the resin and have been used instead of glass beads and microspheres.

CABOT CORP. CAB-O-SIL DIV.

Company's Cab-O-Sil fumed silica is offered as a processing aid, thixotrope, and viscosity-control agent in unsaturated polyesters, epoxies, silicone rubber, and PVC. It is used to control polyester resin viscosity and prevent sagging or running in gel coats and laminating resins during cure. In liquid resin systems it can also help to keep solids, such as fillers, in suspension and evenly dispersed.

In PVC plastisols and calendering, it soaks up excess plasticizer, provides thixotropy, prevents plate-out, and keeps dry compounds free-flowing. Cab-O-Sil's dielectric properties and heat stability also make it a suitable reinforcement for PVC electrical insulation and for silicones.

CANCARB LTD.

Company's Thermax, a medium thermal carbon black provides low-level structure and reportedly the largest particle size of any carbon black. Thermax is produced in several grades in order to meet a customer's individual needs. Characteristics of Thermax include:

* Its ability to be compounded at high-loading levels without degrading polymer properties, thereby producing highly extended compounds and reducing overall costs.

* It has very low abrasion characteristics, resulting in less wear on extrusion equipment.

* It provides good dielectric properties, chemical and heat resistance.

* It has low sieve residue values. Typical values on 325 mesh tests are 0.0005%.

Plastics applications include XLPE wire and cable insulation, heat-shrinkable connectors and pigmentation.

CARBORUNDUM CO.

Fiberfrax alumina-silica fiber is a reinforcing filler said to offer excellent physical properties, low thermal expansion, superior thermal stability, excellent corrosion resistance, superior wear resistance, and resistance to moisture absorption. The fibers are available in a variety of lengths, diameters, surface areas and chemistries, which can be further modified by surface treatments and the removal of unfiberized particulate.

Fiberfrax reinforced composites reportedly have superior retention of physical properties at elevated temperatures. After 240 hr at 425 F, a Fiberfrax composite retained over 95% of its flexural strength, compared with 70% for fiberglass. After 500 hr at 450 F, the composite retained 58% of its flexural strength, vs. 19% for fiberglass.

Fiberfrax epoxy composites are said to offer excellent wear resistance, as well as superior retention of physical properties after exposure to water.

CARBORUNDUM CO. BORON NITRIDE DIV.

Boron nitride, which has a structure similar to graphite, is a specialty multifunctional additive available in various mesh sizes. It adds lubricity and thermal conductivity, but unlike graphite, is electrically insulating rather than conductive.

CATAPHOTE INC.

Solid glass microspheres, in a wide range of sizes, reinforce and extend all thermosets and most thermoplastics used in injection molding, extrusion, compression molding and open-mold casting. For a strong interfacial bond, spheres are treated with silane or other coatings. They are said to increase flow and ease of extrusion, to raise compressive strength, stiffness and abrasion resistance, to reduce creep, water absorption and shrinkage, and to give better mold fill and more uniform cooling, which can cut injection cycle times by 20%.

CLAREMONT FLOCK CORP.

Manufactures cotton, nylon and other synthetic-fiber filler flocks used in plastic formulations.

COLORCO, INC.

Colored or noncolored concentrates containing talc, calcium carbonate or other fillers are available for most thermoplastics.

COMPOSITION MATERIALS CO., INC.

Offers a variety of organic fillers:

* Nut shells--walnut (including English walnut and Eastern black walnut), pecan and apricot pit (flour and grits, all mesh sizes).

* Flock--cellulose (bleached and unbleached), cotton, leather, synthetics.

* Cellulose K (treated), an asbestos replacement.

* Wood flour (hardwood and softwood, 40-325 mesh), also sawdust and shavings.

* Reclaimed rubber dust.

* Rice hulls (flour and grits).

* Corn cobs (flour and grits).

A cross-linked polymer filler is also offered. Trademarked Plasti-Grit flour, product is available in urea, polyester and melamine for compression molding and extrusion.

COZ DIV. ALLIED PRODUCTS CORP.

Offers concentrates, containing different levels of clay and talc, for styrenics, polyolefins and most thermoplastics.

CUSTOM GRINDERS SALES, INC.

Produces a complete line of ground alumina trihydrate, alumina trihydrate/calcium carbonate blends, and calcium sulfate. Custom grinds and blends are offered. (See also Flame Retardants.)

CYPRUS WINDSOR MINERALS

Offers a high-purity, asbestos-free platy talc, which is organophilic and hydrophobic. Material has a small particle size and can be used at levels up to 30% of total mix.

D.J. ENTERPRISES, INC.

Offers Econ-Glass PER solid glass beads in nominal 50-mesh size, and a flame-retardant filler blend of alumina and silica, called Sillum PL-200.

Sillum-200 Q/P is a noncombustible, chemically stable inert alumina silicate, which is processed to eliminate any organic tramp elements that could modify performance. Processing the material to a free-flowing bead, standard 44-75 micron screen analysis provides for ease of blending with liquid or powder materials. It is insoluble, non-thixotropic with excellent suspension and dispersion, nonhygroscopic, reduces shrinkage, and improves hardness.

Metallic beads in a 44-75 micron range are used in applications where additional weight is required, such as nylon counterweight parts, or compounds for lawn furniture. They also offer application as an antistatic control additive.

Company also offers its Micro P resin extender, which is a noncombustible, chemically stable inert amorphous mineral silicate. Micro P is stable-insoluble in water/organic acids; has a high filler loading capability; is nonthixotropic and water-resistant; has low-moisture content; and is nonhygroscopic. It reduces shrinkage and exotherm temperature and is nonconductive and compatible with flame retardants.

DAVISON CHEMICAL DIV.

See W.R. Grace & Co.

DEGUSSA CORP.

Aerosil 130, 200, 300 and 380 are pyrogenic silicas used as thixotropes and reinforcing fillers for silicone rubber and as additives to prevent plateout in calendered PVC. Aerosil R 972 is a hydrophobic pyrogenic silica used as a reinforcing filler for silicone rubber and as a free-flow additive where moisture pickup could cause caking problems.

Aluminum oxide C is a pyrogenic alumina used as an antistatic agent for granular plastics and as a thixotrope in aqueous systems.

Company also manufactures a wide range of precipitated silicas. Sipernat 22LS, FR500LS, and Sipernat 44 are used as antiblocking agents in blown PP film. Sipernat 22LS and FK500LS are also used to prevent plateout in PVC calendered films. Sipernat 22,22S, 50, and 50S act as anticaking aids or can be used to convert liquids into easy-to-disperse powders. Sipernat D17 and D11 are hydrophobic precipitated silicas that are used as anticaking agents for extremely hygroscopic powders. FK140 and FK160 precipitated silicas are used as reinforcing fillers in silicone rubber.

Company also produces OK412, OK500, HK188 and TS100 flatting agents for PVC and coil coatings.

DODGE-REGUPOL, INC.

Cork is supplied in spherical, cubical, elongated, and shredded forms, in particle sizes of 1 in. to 150 mesh and densities of 3-12 lb/cu ft. Cork is an inert filler used to lower cost and density, to build viscosity, and to boost dimensional stability and coefficient of friction. It reportedly can increase thermal, acoustical, and impact-absorption properties when used in sufficient quantities. In most elastomer compounds it is said to reduce sideflow measurably.

DRY BRANCH KAOLIN CO.

Offers a wide range of kaolin clays. Company's Hydrite line of water-washed grades is available in different particle sizes and resin demand. Hydrites are suitable for thermosets and thermoplastics; pH control assures proper cure and stability. The Glomax line of calcined kaolin extenders are designed for optimum electrical properties in wire coatings. Partial Ti|O.sub.2~ replacement is said to be possible in many sheet and molded products with company's Altowhite TE, a 93% brightness, high-opacity extender. Kaopaque, a delaminated aluminum silicate, is said to offer improved physical properties in most thermoplastics.

ECC INTERNATIONAL

Produces a complete line of fine-ground calcium carbonates. Kotamite, Atomite, MicroWhite 15, MicroWhite 15SAM, Supermite and Supercoat are specifically designed for compounding with PVC, PP and PE. Supercoat provides impact and gloss properties in compounds. Snowflake PE is designed for low-viscosity in production of SMC and BMC compounds. Polarite 400 and 800 series are new mineral-based, shrink-control additives for unsaturated polyester compounds. Polarite 420, a thermoplastic-coated calcium carbonate, acts as both filler and low-profile agent. Polarite 880 polymer-coated alumina trihydrate adds flame and smoke suppression, too. Company also produces a line of high-brightness hydrous kaolins, silane-treated kaolins and calcined kaolin.

EAGLE QUALITY PRODUCTS CO., INC.

Manufactures a series of mica products Micaflex R and M. These are used in all thermoplastic and thermoset resin systems as reinforcing fillers. The R Series exhibits low viscosity buildup in liquid resin systems (polyester and epoxy), reduces shrinkage and sinks, and is an excellent partial short-glass-fiber replacement. Micraflex R in polyolefins produces higher elongation and unnotched Izod impact than other micas at comparable concentrations.

Micaflex M series is white and also compatible with all plastic systems. The series allows clean, consistent colors to be produced, particularly in PP and thermoplastic polyesters.

EMERSON & CUMING, INC. W.R. GRACE & CO.

Eccospheres are free-flowing, thin-walled hollow glass spheres ranging from 0.13 to 0.60 g/cc. They can be produced in various strengths and compositions, and special grades are available with tightly controlled size distributions. Eccospheres can be combined with various resin systems to enhance electrical and thermal properties and will reduce the weight of a system while improving the strength-to-weight ratio. Applications for Eccospheres include thermal shielding, high-speed circuitry, syntactic foams, and as a chemically clean carrier for other substances.

ENGELHARD CORP., SPECIALTY MINERALS & COLORS GROUP

Offers four different families of mineral reinforcements:

* Translink surface-modified calcined kaolin-based products are designed to enhance processing and performance characteristics.

* Satintone calcined kaolin-based extenders and reinforcements are inert, fine-particle-sized products having low residue and moisture.

* The ASP-Buca-Catalpo family are hydrous kaolin-based products of various particle sizes and modifications, including surface treatments and delamination. They perform as extenders in various plastic and rubber systems.

* Emcor 66 ultra-short whiskers are used in phenolic molding compounds for brake linings and nonasbestos gasketing.

EXPANCEL-NOBEL INDUSTRIES

Company's Expancel line of expandable thermoplastic microspheres with ultra-low density (0.02-0.06 g/cc) and resilient properties, are white spherically formed particles with an average diameter of 30 microns. They are suitable for reducing weight, improving strength-to-weight ratio and reportedly compensate mechanical and thermal stress. The resilient nature of the product makes a resin mix particularly suitable for spray-up applications. Expancel is used in thermosets, elastomers and coatings.

Company's new grade, Expancel 091, is acrylic-based with strong chemical and thermal stability. The spheres expand at temperatures starting at 266 F and have densities as low as 0.21 lb/gal when fully expanded. Company says that the acrylic-based microspheres open new applications in extrusion, plastisols and possibly PU and RIM systems.

FIBER SALES & DEVELOPMENT CORP.

Company's Solka-Floc is a cellulose filler said to improve impact strength and wear characteristics in moving parts. It boasts low specific gravity, controlled bulk, and good thermal properties. Filled urea compounds are reported to withstand temperature up to 170 F, melamine compounds to withstand 210 F, and darker colored phenolics to take even higher temperatures.

FRANKLIN INDUSTRIAL MINERALS

Formerly TAC Industries, Inc., company supplies calcium carbonate in a wide range of particle sizes. Called Amical, this oolitic material can be used in vinyl, polyester, and urethanes, and reportedly minimizes wear on molds.

Company recently added muscovite mica to its product line with the acquisition of M.I.C.A. Corp. A full range of mica products, including surface-treated, will be available for use in PP, HDPE, phenolic, and epoxy, as well as PU and polyurea (RRIM) applications.

In addition, alumina trihydrates and calcium sulfate dihydrates are offered. (See also Flame Retardants.)

FRANKLIN MINERAL PRODUCTS DIV. THE MEARL CORP.

Wet-ground muscovite mica consists of tiny, extremely thin flakes of a potassium/aluminum silicate crystal with traces of other elements. The flakes have a silvery, off-white color, an average thickness of 0.5-2 microns and a diameter of 2-150 microns. Product is available in nominal 100, 160 and 325 mesh grades and in 1000-mesh and finer special grades. Wet-ground mica can increase stiffness, modulus, yield stress, breaking stress, and heat-deflection temperature. Its high dielectric strength and low power factor make it useful in electrical applications.

FUJIMI AMERICA INC.

Offers high-purity alumina and silica powders for use as fillers. Specializing in precision particle classification for abrasive powders and polishes, company will customize ultra-tight particle-size distributions down to submicron levels.

GLS FIBERGLASS DIV., GREAT LAKES TERMINAL & TRANSPORT

Company offers a broad range of fillers for a variety of applications. Fumed silica may be used for viscosity control or as a drying agent, reinforcement, or thixotrope. Soda-lime-borosilicate glass bubbles reduce the density of polyester castings and reduce the cost of cultured marble.

GENSTAR STONE PRODUCTS CO.

Offers fine-ground limestone (calcium carbonate) products said to be exceptionally white. Camel-Wite has a particle size range of 0.2-12 microns (average 3 microns) and is used in polyester SMC, BMC and prepreg where it aids in viscosity control and glass dispersion, as well as in PVC, PE and PP. Camel-Fil is a low-cost filler for SMC/BMC with a unique particle-size distribution designed for high loading and/or low viscosity. Camel-Tex and Camel-Carb are coarser grades used in BMC and epoxy coatings. Camel-Cal is an ultrafine grade with 90% of the particles smaller than 2 microns; average size is 0.7 microns. Both Camel-Wite and Camel-Cal are available with stearate coatings.

GEORGIA KAOLIN CO.

See Dry Branch Kaolin Co.

GEORGIA MARBLE CO.

Produces finely ground crystalline white marble fillers with a high percent of calcium carbonate. Products are designed specifically for polyesters, PP, PVC, epoxies, elastomerics and adhesives. A stearate-coated filler grade approved for high-pressure potable PVC pipe is also available.

W.R. GRACE & CO. DAVISON CHEMICAL DIV.

Offers its line of functional silicas called Syloid and Sylobloc. Products are synthetic amorphous silicas, which are pure, chemically inert, nontoxic additives used in PVC, PE, PP, PVDC, EVA, CAB, and acrylics. Used in amounts from under 1% to 3%, they are processing aids that absorb excess plasticizer, prevent caking of molding powders and plate-out, and promote printing ink acceptance. These silicas have controlled particle-size distributions and good particle integrity. They are highly efficient flatting and antiblocking agents, which yield high-clarity films. Combinations of Sylobloc silicas and oleamide or erucamide slip aids are also available. Combinations of antiblock and slip aids show improved efficiency over separate addition of the two additives.

GREAT LAKES MINERALS CO.

Offers a line of functional blended fillers said to reduce cost, improve properties such as flame retardancy, impact, flexural and tensile strengths, and help control density of finished parts. Custom blends and packaging are available.

GREFCO INC.

Produces a line of inert mineral fillers from diatomaceous silica and perlite, suitable for use in many plastic applications. Dicalite diatomite multifunctional fillers are used for antiblocking in PE films. In filled plastics they give dimensional stability. Dicalite perlite functional fillers help to reduce weight and provide increased impact resistance through nondirectional reinforcement.

Dicaperl hollow glass microspheres improve impact resistance and machining properties and reduce weight in some formulations.

Solka-Floc cellulose fiber fillers, distributed by the company, improve impact strength and dimensional stability in molded thermoset resins.

C.P. HALL CO.

Offers a full line of fillers for all types of plastics, including micas and clays. Shell flour can be used as a low-density filler in phenolics and cast polyesters.

HARWICK CHEMICAL CORP.

Offers a line of carbon blacks, silicas, clays, calcium carbonates, micas and bituminous coal. Some grades are surface treated for ease of dispersion and improved reinforcing properties. A complete line of silane coupling agents is also offered.

O. HOMMEL CO.

Distributes several types of inorganic fillers, including calcium carbonate, silica, clays and alumina trihydrate.

J.M. HUBER CORP. CALCIUM CARBONATE DIV.

Produces mineral filler/extenders, which include calcium carbonate and barytes in particle size ranges from 1.0 micron average partial size to 40-mesh granular. Surface-treated materials are available for improved dispersion and increased filler loadings. Multiple mine and production locations in Illinois, Washington, Indiana, Texas and Iowa ensure prompt delivery at lowest possible freight rates.

NSF-approved PVC pipe grades are offered, along with products for PVC (flexible, rigid, plastisols, floor tile) polyester, PP, epoxies, elastomers, urethanes and PE.

J.M. HUBER CORP. CHEMICALS DIV.

The Zeothix line of precipitated hydrated silicas offers thixotropy and viscosity control. Zeothix 265 is specifically designed to prevent sagging or running during cure of polyester laminating resins, gel coats, epoxies and PVC plastisols and coatings, and aids in suspension and dispersion of solid fillers in liquid resins. As a processing aid in PVC plastisol and calendering operations, it is said to prevent plate-out, dry up excess plasticizer, and act as a free-flow conditioner where dry compounds are prone to caking or sticking. Beneficial antistat and anti-blocking properties are also reportedly exhibited.

J.M. HUBER CORP. CLAY DIV.

Several types of water-washed, air-floated and calcined kaolin clays are supplied. The fillers reportedly reduce cycle times, extend resins without sacrificing physical properties, reduce pound-volume costs, improve processing and reinforcing properties, reduce mold shrinkage and creep, and improve heat-distortion temperature, electrical properties, surface smoothness, and printability.

Company also offers muscovite micas that are said to have outstanding aspect ratio, purity, and whiteness properties. Reported advantages of composites using the fillers include increased modulus and flexural strength, increased heat-distortion temperatures, decreased warpage, and reduced cost when used as a glass extender.

ICI RESINS US

Winnofil S is an ultrafine (75-millimicrons), surface-coated, precipitated calcium carbonate. It is said to improve impact strength of rigid PVC and can be used alone with polymeric impact modifiers. Winnofil S is designed for low-shear compounding. Applications include rigid PVC conduit, pipe, gutters, and profiles.

IMI LTD.

Surface-treated hollow ceramic microspheres are supplied for use in epoxy, phenolics, polyester, polyimide, PVC, PPS, nylon, PEEK, PP, and HDPE. Seven grades with an average particle size of 100 microns are available in the Holospheres line. For liquid thermoset applications, Metaspheres hollow aluminosilicate spheres come in two grades with average particle sizes of 100 microns and 150 microns.

Hi-K, a proprietary filler blend, is a conductive additive for thermal conductivity. Graf-Lite, a form of low-density graphite, is used in EMI/RFI shielding compounds. High-aspect-ratio flake reinforcements with or without special surface treatments are also offered.

INDUSMIN LTD.

Produces several grades of micronized fillers for use in coatings, polymer, sealant and adhesive applications. Minspar feldspar products are used in translucent or clear plastics because of their low tint strength and reportedly excellent abrasion resistance.

JAMES RIVER CORP.

See Fiber Sales & Development Corp.

KMG MINERALS INC.

Muscovite mica is an inert, complex hydrous aluminum-potassium silicate reportedly offering unusual filler characteristics. Grades are suitable for plastic fillers and come in mesh sizes ranging from 10 to a theoretical 4000 mesh in wet-ground, micronized, or dry-ground grades. In all mesh sizes, muscovite mica maintains a plate-like structure with high thickness-to-diameter ratios of 1:25. HAR wet-ground micas offer aspect ratios of 1:100. This structure is said to provide excellent mechanical reinforcement along a complete plane rather than a single axis as do fiber fillers. The mineral is

also said to offer high heat and chemical resistance, dielectric strength, excellent insulating properties and extremely low order of toxicity.

Company is now offering surface treatment for all mica products, which reportedly offers further improvements in strength because of better filler/matrix bonding.

KAOPOLITE INC.

Kaopolite anhydrous aluminum silicates are available in a wide range of particle sizes. Surface-treated grades are also offered. Products are used as anti-blocking agents.

Siltex fused silica reportedly has outstanding electrical properties. Magotex fused magnesium oxide improves thermal conductivity. Ferrosil-14 ferro-aluminum silicate improves abrasion resistance. Aciculite acicular aluminum silicate has a high aspect ratio. Fiberkal fibrous calcined kaolin is available in a wide range of chopped sizes.

LUNDY TECHNICAL CENTER DIV. TRANS TECHNOLOGY CORP.

Offers Romhoglas, a thermal and electrically conductive aluminum-coated glass fiber. It's available as rovings of various sizes, woven fabric, milled fiber and nonwoven conductive mat.

MALVERN MINERALS CO.

Novacite silica products are a type of quartz having an average particle size of 3-7 microns. This natural microform differs from other silicas in its low sorptive properties and low abrasiveness. It is used as an extender/filler in silicone rubber, various thermosets, engineering thermoplastics and powder coatings.

Novakup is a family of surface-modified particulate silica reinforcements, which can be treated with silanes, titanates, sulfonyl azides, or glass resins.

Other surface-modified inorganic extenders, pigments and fillers offered are Trikup alumina trihydrate, Monykup antimony oxide, Titankup titanium dioxide, Wollastokup wollastonite, Carbokup calcium carbonate, Silikup silica, and Klakup aluminum silicate.

MANVILLE SALES CORP. SUB. OF MANVILLE CORP.

Supplies Celite diatomaceous silica and Micro-Cel synthetic hydrous calcium silicate. Both can be used as functional fillers, processing aids, flatting agents, and antiblocking agents.

THE R.J. MARSHALL CO.

Offers ATH, calcium sulfate, gypsum, calcium carbonate, and light-weight fillers. Products are available separately or in combination, with guaranteed properties such as viscosity, gel time, and color. Special-effect fillers are also available for cast polymer products and polymer concrete.

MICROCEL TECHNOLOGY, INC.

Company manufactures its Ceramcel low-cost, lightweight hollow ceramic spheres for use as fillers and engineered composites. Spheres are available in alpha alumina, mullite and porcelain compositions. They range in size from 1.5-7.0 mm and come with 10-20% continuous intergranular porosity. A second family of spheres is available with engineered porosity on the order of 100 |micro~m extending through the shell wall. Because Ceramcel spheres do not have the extensive inner porosity of solid catalyst pellets, surface-active substances remain at the surface, maintaining maximum effectiveness at high space velocities.

MILWHITE INC.

Company's mineral fillers/extenders include celestite, barytes, calcium carbonate, attapulgite clay, bentonite clay, kaolin clay, talc and slate.

Celestite is a high-specific-gravity filler said to have excellent loading characteristics. Product can be used for sound abatement, acid resistance, and in foams and plastics where weighting properties are needed. Barytes, available from several locations, are both white and off-white. Custom-designed products are available.

THE MONTANA TALC CO.

Produces four distinct lines of ground talc. The grinds in each product line range from a relatively coarse 200 mesh used as an economical functional filler to superfine products with a 1.5-micron median particle size used as reinforcing additives. They are:

* Nicron products for applications requiring high dry brightness and exceptional quality.

* Silverline products for applications requiring 75-86 dry brightness and rock-bottom RMC.

* Steriline products for all USP, cosmetic, food and medical applications. Certified to meet USP VI, CTFA, and food codex specifications, as well as English, French, and German pharmacopoeia specifications.

* "JS" products--controlled top and bottom particle-size distributions for applications that must have maximum loadings for economy, but still meet high performance standards.

NYCO MINERALS INC.

Wollastonite is a naturally occurring calcium metasilicate, CaSi|O.sub.3~. It's said to be the only pure white, wholly acicular mineral that is commercially available. Length-to-diameter aspect ratios typically range from 3:1 to 20:1. Wollastonite products are either ball/pebble milled to mesh size, typically retaining a 5:1 or lower aspect ratio, and attrition milled to retain a high aspect ratio closer to 20:1.

Wollastokup chemically surface-modified wollastonites, help lower viscosities and raise loadings, aid dispersion, and improve physical and electrical properties even after exposure to moisture. Specific particle sizes and aspect ratios of the series are available, tailored to improve properties such as impact and modulus. Surface modifiers currently offered include titanates, sulfonyl azide, ester-based wetting agents, and proprietary coatings. Special dual surface modifications in varying balances can provide functional reactivity with the matrix resin and processing of the composite.

Company's products are used in nylon, polyesters, urethanes, thermoplastic polyester, polysulfone, PP, PE, phenolics, epoxies, fluoropolymer elastomers, and silicone rubber, as well as partial replacements of glass and minerals such as asbestos.

Other products available are a chemically modified glass flake; Micacoat, a chemically surface-modified muscovite mica; and Promaxon, a synthetic hydrated calcium silicate. Company can treat minerals on a toll basis. (See also Flame Retardants.)

OMYA, INC.

Supplies dry- and wet-ground calcium carbonate. Wet-ground Omyacarb comes in fine and ultrafine grades, with or without surface treatment. It's a high-purity, high-brightness grade used in rigid and flexible PVC siding, pipe, profile, calendering and wire/cable compounds, polyolefin film and injection molding. Dry-ground material, ranging from 5 to 20 microns in mean diameter, is offered for plasticized PVC, elastomers, epoxies, polyurethanes, and polyester applications. Omyacarb dry-ground calcium carbonates are produced in California for markets west of the Rockies.

OYSTER SHELL PRODUCTS DIV. DRAVE NATURAL RESOURCES CO.

SF-4 ground and fractionated mollusk shells are 97.5% calcium carbonate by weight. Product is a general-purpose filler said to disperse well in plastics and impart smoothness to calendered and extruded products with less property loss than with fillers of comparable size.

PMS CONSOLIDATED

Specialty additive concentrates in either solid or liquid form, with or without colorants, are available containing fillers, antioxidants, uv stabilizers, silicones, blowing agents, fire retardants, slip agents or antistats.

Company has production and laboratory facilities at 12 locations in the U.S. and Puerto Rico.

PPG INDUSTRIES INC. CHEMICALS GROUP

Offers Hi-Sil ultrafine precipitated silicas used as reinforcing fillers.

THE PQ CORP.

Q-Cel hollow microspheres are fine, inorganic spherical particles developed as a low-density filler/extender for thermosetting plastics. These microspheres can be used in polyurethanes, plastisols, polyester casting, spray-up, SMC and BMC compositions, and syntactic foams. They are said to reduce part cost and/or weight, and to improve structural and performance properties. Applications include simulated-wood furniture parts, boat construction, synthetic marble, body putties, adhesives, sealants, bowling ball cores, SMC and FRP panels, and composites. Both glass and ceramic microspheres are offered in a range of particle sizes and densities and with a variety of metallic or organic coatings.

Facility in Chattanooga, Tenn., offers surface-modified hollow ceramic microspheres. Patented surface-modification technology is trademarked Bubblekup. Extendospheres Bubblekup come in three grades from 57- to 100-micron average particle size and 0.7 specific gravity. XOL-200 Bubblekup, with 100-micron average size and 0.24 density, is used for liquid resin systems.

P.S.H. INDUSTRIES, INC.

Epoxical Core Fill is an expanded shale aggregate designed as a lightweight filler for glass-reinforced epoxy laminates and low-density cores for foundry patterns and plastic tooling, including thermoforming models and molds. Core Fill is available in two sizes and densities; the smaller particles have a bulk density of 8 lb/cu ft; the larger (random oval size of 1/4- to 1/2-in.), 40 lb/cu ft.

PATENTECH CORP.

R&D company specializing in custom-engineered, multicomponent reinforcement and filler systems for compounds, fire-retardant and acoustical materials, and for processing-technology and end-product development. Proprietary materials and technology may be licensed or marketed through joint-venture companies.

Micro-Mix is described as a scientifically engineered filler system consisting of specific proportions of rods, flakes, spheres and irregular particles. It is a dry blend formulated for high loadings without sacrificing physical properties in polyesters, vinyl esters, epoxies and thermoplastics. Loading reportedly may be 60-80% by volume. Sprayed compounds are said to need no rollout. Different systems provide varying degrees of strength, density reduction and flame retardancy. Micro-Mix reportedly offers improved physical advantages and savings in applications such as gelcoat backup, sandwich cores, coatings, tooling and casting compounds. It can be poured, sprayed, extruded or injection molded.

PFIZER, INC.

Offers a full line of mineral fillers, including fine-ground limestones, precipitated calcium carbonates, talcs and a line of surface-treated calcium carbonates of varying particle sizes. Hi-Pflex 100, Super-Pflex 200 and Ultraflex are surface-treated calcium carbonates for filling and reinforcing PVC, PP, PS, PE and other resin systems.

A line of surface-treated talcs is also offered: Microtuff 1000 is designed for polyolefin reinforcement, MicroPflex 1200 for nylons, and Microtuff-F for FDA-approved applications.

ABT2500 and Microbloc antiblock talcs for polyolefin films are also available.

PIERCE & STEVENS CORP.

Dualite ultra-low-density calcium carbonate-coated microspheres can reportedly enhance the properties of reinforced and unreinforced thermosetting polyesters. The expanded polymeric microspheres are based on PVDC and acrylonitrile. Company uses a patented manufacturing process to embed calcium carbonate particles on the surface of the spheres. Unlike glass microspheres or other fillers, Dualite spheres reportedly increase tensile and flexural strength and thermal-shock resistance because of their inherent resilience.

PLAS-COM, INC.

Offers a line of specialized mineral and mineral/glass combination fillers in concentrate form for a variety of resins.

PLASTIC FILLER SALES, INC.

Produces various grinds of calcium sulfate, alumina trihydrate, and calcium carbonate used as fillers, available in 50-lb bags, bulk bags, and bulk truckloads. Custom blends are available.

PLUESS-STAUFER INTERNATIONAL

Produces Plusphere hollow glass microspheres, a low-density filler that primarily functions as a weight reducer. The microspheres are available in a variety of particle sizes with very low moisture levels and controlled densities. They are stable at hydrostatic pressures up to 2000 psi. Company reports that Pluspheres often provide considerable improvements in flow properties because of the "ball-bearing effect" of the spheres. Company also offers the following:

* Martinal--precipitated alumina trihydrate flame-retardant filler.

* Magnifin--precipitated magnesium hydroxide flame-retardant filler.

* Snowfort--surface-modified, high-aspect-ratio wollastonite.

* Docal--ultrafine, surface-coated precipitated calcium carbonate suitable for controlling viscosity and thixotrophy of plasticized PVC. Products are reported to have high chemical purity, whiteness, consistent particle size and an absence of abrasive impurities. (See also Flame Retardants.)

POLAR MINERALS

New supplier provides premium grades of highly pure, low-iron, platy talcs and high-purity calcium carbonates based on domestic processing of imported ores. Automotive markets are a key focus of the company. Rigorous SPC/SQC programs reportedly ensure consistency of product.

POLYPRODUCTS CORP.

Supplies a broad range of fillers for epoxy and polyester systems, including fumed silica, talc, hollow glass spheres, nutshell flour, ceramic pellets and finely divided metal powders (copper, lead, aluminum, brass, tin and bronze).

POTTERS INDUSTRIES INC.

Offers solid and hollow glass spheres as engineering functional additives said to improve processing and flow, reduce cost, and produce isotropic, dimensionally stable molded parts. Maximum bonding with resin is obtained and properties improved with coupling agents. Spheres aid dispersion and reduce orientation of fibers in glass-fiber compounds. Silver-coated spheres are also available for electrical and EMI shielding applications.

PROTEIN TECHNOLOGIES INTERNATIONAL

Poly-Soy is an organic reactive extender for polyesters, PU, PVC and epoxy resins. True density is the same as most resins (1.2), thereby yielding homogeneous blends without the need for thickeners. Gel time and exotherm are said to be reduced substantially by the addition of Poly-Soy. Flame retardancy is also said to be improved, especially in PU. Product is derived from soybeans and is readily available. Current mesh sizes are -20/+60, -60, and -100. Extension up to 40% reportedly is possible.

RM MINERALS, INC.

Offers magnesium hydroxide fillers, which reportedly improve smoke suppression in PVC and PE applications. Two new products have been commercially introduced: Magnum-White and MGH-93, milled to mean particle sizes of 2 microns and 10 microns, respectively.

Magnum-White contains a minimum of 35% magnesium hydroxide and MGH-93 a minimum of 90% (average 93%). Company says end users are reporting significant reduction, or elimination of antimony in their applications.

RALSTON-PURINA CO. See Protein Technologies International.

READE ADVANCED MATERIALS

Offers advanced metal, ceramic, and intermetallic particulate fillers and reinforcements for high-performance applications. Products can be made almost 100% pure, and in sizes down to 10 angstroms (nominal). Surface and chemically modified fillers, platelets, fibers, whiskers, microspheres (monoclinic and stabilized), conductive additives, borides, carbides, and nitrides are offered. EDI and secure communications are available.

REYNOLDS METALS CO.

A complete line of atomized and flake aluminum powders, both regular and dedusted, are available for use as fillers in a wide range of products. The powders are said to improve physical properties and machining characteristics.

H.M. ROYAL, INC.

Company distributes a wide line of fillers, including calcium carbonate, alumina, clays, amorphous silica, talc and mica. Products used in plastics include the following:

* Hydrophilic and hydrophobic grades of fumed silica.

* Airfloated, waterground, and ultrafine precipitated, surface-treated calcium carbonates.

* Fine-particle talcs in a range of light-to-dark shades including extremely white, fine-particle platy talc for modulus improvement and reinforcement.

* Patented, narrow-particle-range precipitated calcium carbonate (0.1-micron average size).

* Flame-retardant fillers, including magnesium hydroxide for flame and smoke suppressant in both halogenated and nonhalogenated systems.

New products include filler-coated microspheres at 0.12 specific gravity for light weight; and micronized fillers, both talc and calcium carbonate under one micron with very close top particle cuts, specifically designed for engineered plastics and use in fibers.

SCM CHEMICALS INC.

Offers an amorphous, fine-particle silica gel called Silcron that is supplied in a variety of grades. Silcron performs as a thixotropic and flatting agent, in addition to preserving clarity and smoothness of finish. It is useful in improving dispersion of pigments; in moisture control; eliminating blocking and plate-out; providing better mar resistance or better pencil and ink receptivity; and ensuring smoother, uninterrupted flow of dry powders. The product is a nontoxic, chemically inert powder averaging 4 to 8 microns in size. It can be dry-blended with resin or pigment powders, compounded into resin melts, or incorporated into a masterbatch or concentrate. Silcron is compatible with a wide range of thermoplastic resins.

ST. LAWRENCE STARCH CO., LTD.

Ecostar is a hydrophobic starch used to provide a matte finish in PVC plastisol applications. It is also used as a biodegradation enhancer in extruded polyolefins and reportedly provides low-gloss finish and excellent antiblock properties in extruded film.

SEEGOTT INC.

Offers a range of fillers, including diatomaceous silica, synthetic hydrous calcium silicate, calcium carbonates, talcs, surface-treated calcium carbonates and talcs, plus a complete line of aluminum flake and atomized powders for use as fillers.

SHAMOKIN FILLER CO. INC.

Carb-O-Fil is a low-cost, black, inert carbon filler ground from coal, with a specific gravity of 1.47. It reportedly disperses readily and is used in PS, phenolics, urethane coatings, polyesters, etc.

SHERWOOD DIVERSIFIED INC.

Supplies alumina trihydrate, calcium carbonate, and talc fillers for a wide variety of plastics applications. Company will tailor products to customers' needs. Services include custom blending, custom coating of fillers with stearates, and matching particle-size ranges.

SILBRICO CORP.

Sil-Cell is a low-density, hollow inert filler, which displaces up to six times its weight in resin and can be used to replace up to 40% of the resin in a compound. This cellular mineral filler has an average particle size of 45-75 microns, is typically used in epoxies, polyester cultured marble, FRP tub/shower enclosures, decorative plaques, joint compounds, and furniture parts, and can be pumped and sprayed in liquid resin systems. Sil-Cell is available with various surface treatments to control viscosities.

SLOSS INDUSTRIES CORP.

Company reports that its PMF fiber, used as a filler/reinforcer, generally improves properties and/or lowers cost (compared with milled glass) in general-purpose nylon 66, general-purpose and high-temperature-grade PP, general-purpose, low-fluxing phenolics and PBT. PMF fiber can be used in greater amounts than short asbestos fibers without causing overly high viscosities and can be added along with other dry ingredients. PMF provides short fibers for filling inside corners, and in molded in-hole areas and molded-in pin areas, which are usually fiber-poor. The shortness of the fiber allows it to flow well with the resin and reduces flow-line segregation.

SOLEM DIV. J.M. HUBER CORP.

Manufactures a broad line of standard and surface-treated hydrated alumina fillers. The Micral series of mechanically produced ultrafine hydrated alumina replaces precipitated ATH in most applications. The extremely fine particle distributions of the Micral products are said to provide a high degree of active surface area for enhanced flame retardance, excellent surface profile, and high physical properties.

Company's custom-engineered ATH products are recommended for thermoset polyester, polyolefins, PVC, urethane, epoxy, phenolic, and rubber. Blends of hydrated alumina and calcium carbonate are also offered for certain thermoset polyester applications.

SOUTHERN CLAY PRODUCTS

Supplies a wide range of bentonites, talc, antisagging/setting agents, gelling agents, thickeners, and suspension agents.

STEEP ROCK RESOURCES, INC.

Offers its Snowhite high-purity, dry-ground calcium carbonates. Packing ratios and tightly controlled particle-size distribution reportedly allow optimized filler levels.
COPYRIGHT 1992 Gardner Publications, Inc.
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Copyright 1992, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Title Annotation:plastics industry
Publication:Plastics Technology
Article Type:Buyers Guide
Date:Jul 15, 1992
Words:6751
Previous Article:Colorants: product lines reviewed.
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