LITERATURE Materials.

Mold insulating material

This six-page, two-color technical bulletin describes GlasTherm thermal insulation material, developed to be an excellent medium for holding in the heat in press molds, according to the company. GlasTherm is a fiberglass reinforced, mineral filled sheet bonded together with heat resistant thermosetting resins. This literature highlights reasons why molds need to be insulated, and what a company can save as a result of using GlasTherm. The literature also includes seven tables, as well as several diagrams, to provide technical and engineering assistance in the selection process. (Dielectric, W141 N9250 Fountain Blvd., Menomonee Falls, WI 53051)

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Flame retardants

An overview of the role of flame retardants in rubber compounds is presented in company literature. A full line of flame retardants and their applications are highlighted. The brochure covers the major concerns to be considered when compounding, conditions required for combustion, main fuel sources, basic flame retardant functions and the two basic types of systems. The brochure provides facts and addresses alumina trihydrate, magnesium hydroxide, antimony oxide, chlorinated paraffin, phosphate esters and zinc borate. (Harwick Standard Distribution, 60 S. Seiberling St., P.O. Box 9360, Akron, OH 44305-0360)

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Elastomer properties

The company's reference chart rates each of 16 traditional and advanced elastomers on hardness, elongation, tensile strength, heat resistance, chemical resistance and other properties. The chart, "Properties of selected elastomers," rates each elastomer on a four-step scale from excellent to poor. Among the elastomers listed are natural rubber, synthetics in common usage, such as EPDM, silicone, urethane and polysulfide, and some of today's more exotic synthetic rubbers, such as fluoroelastomer and fluorosilicone. The chart is intended to be a single, convenient guide for chemists, designers and engineers, and a starting point for designing or specifying elastomers for industrial use, according to the manufacturer. (Pelmor Laboratories, 401 Lafayette St., Newtown, PA 18940-0309)

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Release agents

KantStik 91WX, a high performance, water-based, semi-permanent release agent designed for high temperature molding conditions well over 450 [degrees] F (232 [degrees] C), is featured in a two-page technical bulletin. KantStik 91WX is composed of a polymeric material which provides a coating said to have excellent thermal stability and film strength, while minimizing mold buildup, according to the literature. (Specialty Products, 75 Montgomery St., P.O. Box 306, Jersey City, NJ 07303-0306)

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Silicone mixing

An information packet describes capabilities for custom compounding and mixing of silicone bases and compounds. The information kit lists services available to fabricators in five major markets, including automotive, aerospace, electrical, electronics and healthcare. The kit also outlines 20 categories of compounds which can be developed and produced. The kit characterizes the company's technical staff as experienced not only in the technology of polymers, bases and compounds, but in parts fabrication as well, leading to an understanding of each customer's special requirements. (Immix Technologies, LLC, Cri-Sil Division, 359 Hill St., Biddeford, ME 04005)

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SEBS polymers

Two brochures released by Repsol Quimica on Calprene H SEBS polymers are available from this North American distributor. The first is a general specification brochure which describes the properties of the three new SEBS grades. The second is an applications bulletin on the use of Calprene H SEBS polymers in polyolefin and styrenic plastic compounds to enhance performance and aging. (Momentum Technologies, 1507 Boettler Rd., Uniontown, OH 44685)

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Semi-permanent releases

This brochure gives a brief overview of the company's release agents for elastomers, thermosetting plastics and advanced composites. Formulations are available in water or in non-ODC solvents. Most of these release agents are semi-permanent in nature, providing any number of benefits for the molder, according to the company. Custom formulating services are available for demanding applications. (Releasomers, P.O. Box 82, Bradfordwoods, PA 15015)

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Thermoplastic rubber

An eight-page color brochure summarizes medical applications and performance data for Santoprene thermoplastic rubber. All 15 medical grades of Santoprene rubber are USP Class VI compliant, including Santoprene 8000 grades, which are said to be the easiest to color and best processing grades available. For grips, seals and tubing, Santoprene rubber is said to expand medical design possibilities. (Advanced Elastomer Systems, L.P., 388 S. Main St., Akron, OH 44311-1059)

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Processing polymer

Vestenamer rubber is featured in a 12-page brochure offering information on this polymer used in rubber compounding and processing. Vestenamer polyoctenamer is said to be compatible with almost all rubbers and can compatibilize polymers that are otherwise incompatible. The brochure describes the synthesis and structure of Vestenamer polyoctenamer and discusses its four characteristic structural features, including crystallinity, low viscosity above the melting point, high proportion of macrocycles and double-bond content. The brochure also explains the influence of Vestenamer polyoctenamer on vulcanization properties, as well as its calendering capabilities. It also includes charts displaying the properties of various grades of Vestenamer and a thermogravimetric analysis. Applications for Vestenamer include tire production, rubber recycling, production of polymer-bound masterbatches of chemicals and modification of thermoplastics. (Creanova, 220 Davidson Ave., Somerset, NJ 08873-6821)

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Deflashing, deburring

Polyblast deflashing, deburring and mold cleaning media are highlighted in the company's six-page, fold-out pamphlet. Color photographs are used to illustrate molded rubber and plastic components prior to and after deflashing with Polyblast cryogenic deflashing media. Also discussed in the literature are shot sizes that are available for sensitive parts or for heavy deflashing. Polyblast is manufactured from 100% polycarbonate resin in the medium viscosity range, and has excellent thermal resistance and toughness, which is said to allow it to withstand extremely low temperatures. (Abrasive Supply, 25240 State Route 172, Minerva, OH 44657)

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