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MATERIALS.

Rubber release agent

KantStik 91WX, a release agent for rubber molding, is said to use the latest dry film technology for lubrication of molds. This product has been formulated with a polymeric-base material which can withstand high temperature molding conditions well over 450 [degrees] F, according to the manufacturer. KantStik 91WX is water-based, non-flammable and safe to use, providing a better working environment, according to the company. KantStik 91WX was specifically designed for the molding of rubber items, including natural rubber, EPDM, polyacetate and others, without the use of silicone-based products. (Specialty Products, 75 Montgomery St., P.O. Box 306, Jersey City, NJ 07303-0306)

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Silicone rubber

A silicone robber compound is said to be the key to improved lightning protection and longer service life in distribution arresters. The flexible, non-fragmenting elastomer retains its hydrophobicity better than porcelain or competing polymers, resisting leakage current, tracking and erosion, according to the company. Unlike other polymer materials for the application, the silicone is said to maintain its hydrophobicity over time, resulting in higher withstand voltage levels and lower leakage currents, according to the manufacturer. The silicone rubber formulation is said to have been proven in field service and more than 6,000 hours of multi-stress testing. (Dow Corning, Midland, MI 48686-0994)

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Thermoplastic rubber

A 40-inch wide corrugated expansion joint made of Santoprene 8000 thermoplastic robber can withstand seismic movement by being able to expand and contract 30 inches horizontally in each direction and 30 inches laterally in each direction. Santoprene 8000 thermoplastic robber was noted to be easy to process and it met needed tolerances. The expansion joint's durometer requirements to hold its rigidity yet provide significant elongation capability were met with Santoprene 8000 rubber, according to the company. The portal system must also provide a weather-tight seal for the building by preventing water penetration and must withstand substantial positive and negative wind loads. Santoprene 8000 robber is also said to provide ultraviolet protection and is colorable. (Advanced Elastomer Systems, L.P, 388 S. Main St., Akron, OH 44311-1059)

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Semi-permanent release

Diamondkote water-based, semi-permanent release agents are based upon a non-transferring chemistry that is said to deliver improved mechanical slip while not sacrificing longevity. Many products have been tested successfully in the automotive markets, according to the company, including rubber-to-metal bonding applications. These new product innovations are said to be working on virtually all types of rubber, including polychloroprene, nitrile robber, ethylene acrylics, SBR, fluoroelastomers, natural robber and EPDM. (Franklynn Industries, 167 Commerce Blvd., Cincinnati, OH 45140)

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Silica dispersion

FlowSil is a patent-pending, synergistic combination of silane coupler and silica dispersion aid. FlowSil is said to significantly improve factory processing as judged by laboratory tests, including mold flow, Mooney viscosity, aged viscosity, mixing power, Mooney scorch, dispersion and extrudate surface quality, according to the company. Cured physical properties are said to be minimally affected. FlowSil is a non-staining, easy-to-use, powdered liquid concentrate, according to the manufacturer. It is now available with a tetrasulfide silane coupler (FlowSil-D). (Flow Polymers, 12819 Coit Rd., Cleveland, OH 44108-1614)

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Thermoplastic elastomer

Rimflex thermoplastic elastomer grade A/AS-05 Natural is the softest compound in the company's S Series of TPEs, featuring a low Shore A durometer of 5-A. Rimflex A/AS-05 can be injection molded or extruded using conventional thermoplastic processing equipment. The company is said to provide a diverse selection of thermoplastic elastomers representing a wide range of different technologies and chemistries. Grade A/AS-05 is intended for processing on conventional injection molding or extrusion processing equipment. Rimflex grade A/AS-05 Natural is compounded with special ingredients that conform to a variety of FDA regulations. In addition to the S Series, the company offers the TPU Series, OM Series, SC Series, TPV Series and Grip Series. Each Rimflex series is said to offer optimized performance characteristics for specialized applications. (Synthetic Rubber Technologies, PO. Box 639, 11021 Wright Rd., N.W., Uniontown, OH 44685)

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Fluoroelastomer black

Combining expertise in carbon black and fluoroelastomer technology, the company is said to produce a line of fluoroelastomer black master-batch for customers desiring to control their own formulary but without the nuisance of having to work with black fillers. In addition to standard loadings to achieve various hardness levels, the company offers a proprietary line of masterbatch products specially formulated to enhance physical properties. The company provides fluoroelastomer compounding and custom mixing services. (Pinnacle Elastomeric Technology, 5336 BBS Way, Braselton, GA 30517)

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Water-based aerosols

The company offers three of its water-based release coatings in aerosol form. McLube 1782, 1829 and 1849 are said to be user- and environmentally-friendly and non-flammable. These formulas are said to provide multiple releases from a single application for a wide variety of robber compounds. Ease of application, improved flow properties, elimination of knit and flow lines and reduced scrap rate are among the reported benefits, according to the manufacturer. McLube 1849 and 1782 are said to be highly recommended for the release of silicone rubber, while McLube 1829 is recommended for all organic compounds. In-house testing with customers' compounds or samples for plant trials is available. (McLube Division, McGee Industries, 9 Crozerville Rd., Aston, PA 19014)

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Melt-processible rubber

This manufacturer of melt-processible robber has developed grades of Alcryn that are said to provide virtually universal bondability to rigid engineering substrates in overmolding and coextrusion applications. The commercial grades of Alcryn MPR are said to be heavily used in hard/soft composite components and inherently form melt or chemical bonds to rigid substrates, such as PVC and polycarbonate/ABS alloys. To expand upon the preferred techniques of melt and chemical bonding to join flexible and rigid polymeric components, the company is said to be nearing completion of work that will expand the range of bondable substrates to include polycarbonate, ABS, unfilled and glass-filled Nylon 6, PET and a variety of alloys to those polymers. Using Alcryn MPR in these techniques is said to enable better adhesion between the hard and soft materials, while eliminating costly and labor intensive steps. (Advanced Polymer Alloys, 3521 Silverside Rd., Quillen Bldg. 2E, Wilmington, DE 19810)

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Rubber molding release

The company's R-500 water-based release interface is said to give molders of most robber goods an exceptionally high number of releases between release agent applications. When this water-based microemulsion is spray applied to a heated metal surface, the reactive resin crosslinks and physically bonds to the metal surface. Superior multiple release performance is said to result from a high crosslink density and strong affinity for mold surfaces. R-500 water-based releasing interface is said to provide a durable release surface which does not transfer to released parts. R-500 releasing interface is recommended for applications where maximum multiple release performance is paramount. The product is available in one gallon, five gallon, 55 gallon and 275 gallon tote quantities. (Dexter, Polymer Systems, One Dexter Dr., Seabrook, NH 03874-4018)

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Silane coupling agent

Struktol SCA 984 is a bifunctional silane coupling agent for rubber compounds using non-black fillers, i.e., silica, silicates, clay and whiting. It can be used as a replacement for the mercapto-silanes and is said to offer improved scorch resistance and low odor. SCA 984 can be used for NR, IR, SBR, BR, NBR and EPDM compounds. (Struktol Company of America, 201 E. Steels Corners Rd., PO. Box 1649, Stow, OH 44224-0649)

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Water-based releases

The company continues to replace solvent-based mold releases with water-based formulations, this time with a silicone rubber and a fluorosilicone rubber. Not only did this product provide a safe alternative to the solvent-based incumbent, but it also exhibited increased performance as measured by the number of parts released before touchup, according to the manufacturer. This company is said to utilize the unique formulation in these products to maintain clean tools requiring less down time for cleaning. (Franklynn Industries, 167 Commerce Blvd., Cincinnati, OH 45140)

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Silicone rubber compound

A silicone high-consistency rubber (HCR) is designed specifically for electrical insulators, surge arresters, weather sheds and railway insulators. The cured 80 durometer material is said to combine excellent dielectric properties and good processing characteristics for easy molding with injection, transfer or compression methods. HV 1760-80 silicone rubber (Type ASTM D 1418 VMQ) is said to offer faster hydrophobic recovery time than previous materials and excellent underwater dielectrics, according to the manufacturer. In addition, the material is said to have demonstrated improved molding characteristics and easier processing. The material is part of the company's RapidCure series of materials based on. platinum catalyst technology. Important physical properties are said to include electrical insulation, tracking resistance and flame resistance. (Dow Corning, Midland, MI 48686-0994)

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Extruded fluoroelastomer

A fluoroelastomer compound that is said to be easily extruded and has a finish similar to that of a smooth EPDM window channel product has been produced by the company. The compound is available in a 75 durometer version which does an exceptional job of holding dimensions, according to the manufacturer. Lower or higher hardness levels can be developed in the company's laboratory facilities on a case by case basis. (Pinnacle Elastomeric Technology, 5336 BBS Way, Braselton, GA 30517)

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Semi-permanent releases

A semi-permanent, water-based release coating is recommended for use on all rubber compounds. MAC-610 is a water-based fluorochemical solution that is said to provide excellent durability and is completely extendable in water. Laboratory tests have been run on EPDM, ECO, NR, SBR, HNBR, FMK, CR, polyurethane, polyacrylate and silicone elastomers with superior release performance, according to the manufacturer. MAC-610 can be applied to either hot or ambient temperature mold surfaces with no bake-on period required. (McLube Division, McGee Industries, 9 Crozerville Rd., Aston, PA 19014)

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Colorable rubber

The Alcryn line of melt-processible robber is said to offer excellent colorability for appliances, hand tools, garden tools, automobiles, marine applications, boat and pool accessories, and other applications in service temperatures up to 125 [degrees] C. Many vulcanized robber parts are said to change color or fade when exposed to heat, weather or UV light. However, Alcryn MPR is said to deliver exceptional durability in harsh environments, stands up well to heat, cleaning agents and the body's natural oils, and withstands corrosion and UV deterioration, according to the company. And, unlike vulcanized rubber, Alcryn MPR can be processed on standard thermoplastic equipment in various colors, including soft pastels and bright neons. Tests are said to reveal that Alcryn MPR beats thermoplastic elastomers in aging and colorability, and colors more brilliantly using less pigment than most TPEs, according to the manufacturer. Accelerated aging tests of Alcryn MPR are said to predict a long product life without deterioration or color change, despite environmental and chemical exposure, according to the company. (Advanced Polymer Alloys, 3521 Silverside Rd., Quillen Bldg. 2E, Wilmington, DE 19810)

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Mold insulating material

GlasTherm is a thermal insulation material, said to be an excellent medium for holding in the heat in press molds. It is a fiberglass reinforced, mineral filled sheet bonded together with heat resistant thermosetting resins. The material does not contain any asbestos fibers. Two grades of GlasTherm include grade S, a general purpose sheet where continuous operating temperature does not exceed 425 [degrees] F, and grade HT, said to have superior heat resistance for applications with continuous use temperatures up to 550 [degrees] F. GlasTherm is designed with high compression strength properties of 45,000 psi (grade S) and 49,000 psi (grade HT), versus 14,000 psi for asbestos concrete and 2,350 psi for calcium silicate, according to the company. When inserted between the mold and press platen, the insulation offers a thermal conductivity of 1.8 (grade S) and 1.9 (grade HT). GlasTherm is said to provide cost savings to molders which are realized through reduction in steam and natural gas consumption, shorter startup times, reduction in down times, increased cycle times and/or improved product uniformity. Sheets are available in sizes of 36" x 72" and 48" x 96", in thicknesses of .250, .375, .500, .750 and 1". (Dielectric, W141 N9250 Fountain Blvd., Menomonee Falls, WI 53051-1648)

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Urethane foams

Several grades of Poron urethane foam materials have been awarded the UL-JMST2 component-gasket material rating. This rating is specifically directed to gasket materials that are used to seal or protect electrical enclosures (UL-50), and industrial control equipment (UL-508). The materials with the new rating include Poron 4701-30 urethane foams, which are very soft materials used to make compressible seals, and Poron 4790-92 urethane foams, which are slow rebound materials with greater energy absorption characteristics. The thin Poron materials were developed in response to market demand for gasketing and sealing materials that can be used in smaller or miniaturized equipment designs, to ruggedize and protect sensitive components, according to the manufacturer. (Rogers, One Technology Dr., PO. Box 188, Rogers, CT 06263-0188)

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Internal mold release

An internal mold release (IMR) for silicone is designed to be added to the silicone compound to facilitate the demolding of finished parts. Unlike spray-on external mold releases, which can be difficult, if not impossible, to apply to undercuts, an IMR is carried to every surface of the mold that comes into contact with the rubber compound, according to the company. In many cases, the use of an IMR is said to reduce or eliminate the use of conventional spray-on lubes, along with the subjective production variables associated with them. Traditional IMRs for silicone rubber are based upon various stearates which adversely affect the compression set of silicone compounds, even when used in minimal amounts, according to the manufacturer. Compression set is said to be less affected by Silcosperse IMR-280. (Gayson Specialty Dispersions, 30 Second St., S.W., Barberton, OH 44203)

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NR mold releases

The company announced an addition to its line of mold releases for natural rubber. Designed to replace some of its most popular semi-permanent releases for natural robber, these improved products have been providing more heats (as high as 20% increase) before touch-up, while not sacrificing lubricity or tool cleanliness, according to the manufacturer. (Franklynn Industries, 167 Commerce Blvd., Cincinnati, OH 45140)

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Anti-stick coatings

Non-foaming, anti-stick coatings are available for cured and uncured robber compounds. As with many water baths, surface foam can be a house cleaning problem for production personnel, according to the company. MAC-414 and MAC-621 are said to eliminate or reduce costly downtime for cleaning. Both formulas are water-extendable and produce dry, bonded anti-tack films without the use of powders such as talc or stearates. MAC-414 and MAC-621 will not cause mold fouling or interfere with rubber-to-metal bonding, according to the company. (McLube Division, McGee Industries, 9 Crozerville Rd., Aston, PA 19014)

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Silicone molding

Silicone rubber compounds have been developed for molding high-voltage insulators, surge arresters, weather sheds and other components. All three of the high-consistency rubber (HCR) products in the 1600 Series are said to deliver excellent tracking resistance, good mold release and superior wet electrical performance. HV 1650-50 silicone robber (Type ASTM D 1418 VMQ) is a 50 durometer hydrophobic material designed with low modulus primarily for molding surge arresters. Two related products, HV 1660-65 and HV 1660-75 silicone rubbers, are 65-and 75-durometer formulations which are also said to be well suited to molding high-voltage insulators and weather sheds. All three are said to feature good processing characteristics for easy molding with injection, transfer or compression methods. HV 1600 Series HCRs are said to deliver excellent electrical properties, including a dielectric strength greater than 400 volts/mil (IEC 243), and a dielectric constant up to 3.86 at 100 Hz (IEC 250). (Dow Corning, Midland, MI 48686-0994)

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Polychloroprene compound

A polychloroprene gasket compound is said to be suitable for use in both UL50 and UL508 applications, and is known for its superior flame resistance, according to the manufacturer. The UL50 standard is for enclosures for electrical equipment, and the UL508 standard is for industrial control equipment. By meeting the gasket requirements for both UL standards, the compound can be used in the following NEMA type enclosures: 2, 3, 3R, 3S, 4, 4X, 5, 6, 6P, 12, 12K and 13. The listing of the compound can be found under UL157 (the standard for gaskets and seals) Product Category JMLU1: Compound - Gaskets and Seals. The compound can be used in both indoor and outdoor applications requiting dust-tight and water-tight sealing, primarily for electrical enclosure applications and industrial uses by protecting the equipment from fibers, dust, water and condensation, according to the manufacturer. (Lauren Manufacturing, 2228 Reiser Ave., S.E., New Philadelphia, OH 44663)

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Non-phenolic tackifier

This manufacturer of dispersions and additives for the rubber industry recently received the 1999 EDI Innovation Award for the development of Protac NPT, a nonphenolic tackifier. Protac NPT was placed on the market after a number of years of development and product testing. Protac NPT is said to provide good tack longevity, increased adhesion to polyester, reduced affinity to steel and improved static ozone protection, according to the company. Protac NPT is manufactured as free flowing pellets that resist massing even under warm and humid conditions, and can be used with automatic handling systems, according to the manufacturer. Protac NPT also is said to result in far less mold fouling and can reduce tackifier costs by as much as 30%, compared to conventional phenolic resin tackifiers, according to the company. (Flow Polymers, 12819 Coit Rd., Cleveland, OH 44108-1614)

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Sheet damping materials

Isodamp TED and Isodamp TAD extensional damping sheets are said to effectively reduce noise and vibration in a wide range of OEM equipment. The materials, which are said to provide effective damping performance at minimal weight and cost, are said to be ideal for use on thin, lightweight panels, to attenuate structure-borne vibration, reduce structural fatigue and minimize failure, according to the company. Isodamp TED material comprises a damped adhesive layer, a damped spacing layer and a high-modulus viscoelastic surface coating. Especially durable, the material is said to exhibit good tensile and tear strength, resist abrasion and withstand exposure to oils and fluids, according to the manufacturer. TED damping sheet material also is available with a half-inch or one-inch layer of acoustical absorption foam and a protective aluminized polyester film facing. For extensional damping applications requiring good flame properties, Isodamp TAD materials are said to feature a flame-resistant 5-mil aluminum facing over a damped viscoelastic adhesive layer. Easily die-cut, TAD materials can be installed to both concave and convex shapes, according to the company. (E-A-R Specialty Composites, 7911 Zionsville Rd., Indianapolis, IN 46268)

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Cyanoacrylate solvent

A safer cleaning solvent has been developed for those using cyanoacrylates, according to the company. Dynasolve M-35 was designed to replace more hazardous products currently being used in several industries, including products containing methylene chloride. Dynasolve M-35 is a non-regulated, non-flammable, nonchlorinated, non-carcinogenic solvent. It is said to be effective in the removal of cured cyanoacrylates from equipment and parts. It is also said to be an effective flushing solvent for removing uncured material from dispensing equipment. (Dynaloy, P.O. Box 33609, 1910 S. State Ave., Indianapolis, IN 46203)

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Adhesion promoters

Low molecular weight analogs of the company's proprietary metal organic adhesion promoters have been developed. The products are said to offer improved solubility in many resins and solvents, and improved performance. B-505.1LMWH (mercapto functional for all sulfur cured rubbers), B-515.1LMWH (amino functional for 2K epoxy, 2K urethane), B-515.4LMW (amino functional for WB acrylic, WB alkyd and polyurethane dispersions) and C-523.2LMW (hybrid hydroxy and carboxy functional for SB acrylic, SB alkyd) have been introduced. A hybrid of amino and mercapto functionality (B-511.1) has been introduced for use in 2K epoxy, 2K urethane and rubber solutions. (Chartwell International, 100 John Dietsch Blvd., Attleboro Falls, MA 02763)

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Rubber process insulation

Pyropel MD-60 is a rigid, polyimide fiberboard insulation developed specifically to meet the stringent demands of rubber and plastics processing. It is designed to withstand temperatures up to 600 [degrees] F (315 [degrees] C) and is two to four times more effective than other commonly used thermal insulation materials, according to the manufacturer. Reinforced through a patented manufacturing process, it is said to be dimensionally stable and exceptionally tough and durable. Unlike other organic insulation boards which crack when subjected to compression forces, thermal expansion or thermal shock, Pyropel has high compressive strength, is non-brittle and will not crack under extreme conditions, according to the company. It is said to be readily installed on process equipment or tooling. Pyropel MD-60 is said to be ideal for insulating the base of compression molding platens, and injection molding, thermoset, elastomer and RIM tool bases. (Albany International, High Performance Materials, 777 West St., R O. Box 9114, Mansfield, MA 02048-9114)

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Flushing solvent

A flushing solvent has been developed for the polyurethane industry. UR-Away FL was developed to compete with various low-cost flushing solvents, including those containing DBE. UR-Away FL is said to outperform DBE in both speed of flushing and amount of material flush, and is priced competitively, according to the manufacturer. In addition, UR-Away FL is said to be a safer solvent than many flushing materials. The flash point is greater than 300 [degrees] F and it contains no hazardous or reportable materials. UR-Away FL flushes urethane prepolymers, isocyanates and partially reacted intermediates from pouting equipment quickly and completely, according to the company. It is said to be effective for urethane resins, urethane-based adhesives and polyurethane foam products, either TDI or MDI. All flushed residues settle out of the solvent quickly, making it an excellent candidate for filter recycling steps, according to the company. (Dynaloy, R O. Box 33609, 1910 S. State Ave., Indianapolis, IN 46203)

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Anti-blocking agents

The company has developed a line of silicone-free, water-based anti-blocking agents. Marketed under the tradename Aqualift, these products are said to have proven valuable to molders for the transportation industries, predominantly with SBRs. These anti-blocking agents can be purchased ready-to-use or in concentrate form, making them very cost-effective compared to the stearate baths commonly used, according to the manufacturer. (Franklynn Industries, 167 Commerce Blvd., Cincinnati, OH 45140)

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Conductive adhesives

The company's conductive adhesives meet temperature range requirements from -55 [degrees] C through 150 [degrees] C. They are said to produce a bond that cures quickly at room temperature. After cure, the bond or seal is flexible and water proof. Their consistency and high conductivity permit optimum silk screening for engineering design applications, according to the company. They are said to maintain a shelf life of up to six months. The conductive one and two part adhesive sealants are said to adapt to meet almost any bonding requirements. (Tecknit, 129 Dermody St., Cranford, NJ 07016)

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Super-soft EPDM sponge

Super-soft EPDM black closed-cell sponge compounds feature a density of 12 [+ or -] 3 pcf, a compression deflection rating of 2-5 psi, compression set of 10% and are rated as ASTM 2A1. The super-soft EPDM sponge was designed for applications that require low closure force in the automotive, marine, transportation, heavy equipment and weather stripping industries. The compound can be laminated with pressure sensitive adhesive systems for easy seal attachment, according to the company. It is said to have good ozone, UV and weatherability characteristics. (Lauren Manufacturing, 2228 Reiser Ave., S.E., New Philadelphia, OH 44663)

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Copolymer hotmelts

Copolyamide, copolyester, polyethylene and ethylene vinyl acetate copolymer hotmelts are available from the company. Platamid copolyamide hotmelts are used for fusible interlinings for the garment industry. Platherm copolyester hotmelts are used mainly for non-wovens used as interlinings for specialty garments. Plathen and Platabond, with are polyethylene and ethylene vinyl acetate copolymers, respectively, are used in the textile sector for the manufacture of small items. Hot melts are also used for technical laminations, e.g., in the automotive industry. (Elf Atochem, 4, Cours Michelet, La Defense 10, Cedex 42, 92091, Paris, France)

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Encapsulation system

Conapoxy FR- 1271 is a two-component epoxy potting and encapsulation system. It is said to have excellent thermal shock characteristics and is recommended for strain-sensitive device applications. FR- 1271 has a one-to-one mix ratio by weight or volume, a viscosity of 18,000 cps and a work life of 120 minutes at room temperature. Non-abrasive fillers are said to allow for easy machine mixing and dispensing. (Conap, 1405 Buffalo St., Olean, NY 14760-1139)

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Epoxy casting system

A high performance epoxy casting system is formulated as a companion product for the company's Ren Shape-Express 2000 machinable moldmaking material. Both products are said to exhibit the strength and heat resistance required to produce high-quality injection molds. Together, they are said to offer prototypers and injection molders the ability to quickly build tools via casting, machining or a combination of both, according to the requirements of individual projects. The Ren MEZ epoxy is said to offer good fluidity, despite its high loading with injection molding-compatible fillers, and is said to exhibit very low shrinkage. It is said to produce molds with excellent dimensional stability and good strength, even when exposed to the pressures and temperatures used in injection molding a broad range of thermoplastics, according to the company. Tools produced from the castable epoxy are said to exhibit a high-quality surface that can be polished to achieve a metal-like finish, according to the manufacturer. (Ciba Specialty Chemicals, 4917 Dawn Ave., East Lansing, MI 48823-5691)

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Acrylic-based adhesive

Scotch-Weld DP-8005 structural plastic adhesive is a two-part acrylic-based adhesive (10:1 ratio by volume) that can bond many low surface energy plastics, including many grades of polypropylene, polyethylene and thermoplastic elastomers, without special surface preparation, according to the company. Scotch-Weld DP-8005 can replace screws, rivets, plastic welding and two-step processes which include chemical etchants, priming or surface treatments, according to the company. (Rudolph Bros. & Co., R O. Box 425, Canal Winchester, OH 43110)

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COPYRIGHT 1999 Lippincott & Peto, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1999, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Title Annotation:used in rubber manufacture
Publication:Rubber World
Geographic Code:1USA
Date:Jun 22, 1999
Words:4379
Previous Article:EQUIPMENT.
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