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Materials . . . RUBBERS &
ELASTOMERS
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Free Info - Circle 532 Hydrophobic polyol. Multranol 8224 is designed to make solid polyurethane elastomers virtually impervious to wet or humid environments. It improves the water resistance of polyurethane elastomers, making them suitable for a variety of applications including electrical encapsulants. It can be used with a variety of polyisocyanates to produce elastomers in the 35 to 75 Shore D hardness range. It exhibits 5 to 10 times lower water absorption than conventional polyether-based polyurethanes, superior resistance to chlorinated water, and excellent resistance to hydrolysis at high temperatures and humidity. It is characterized by its low viscosity and ability to readily blend with a variety of polyisocyanates. Bayer Corp, Pittsburgh, PA. http://www.bayer.com/polymers-usa Free Info - Circle 529
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Silicone rubber extrusions. These continuous lengths of
silicone rubber extrusions are made from highly stable, hybrid elastomers that offer
greater reliability under many conditions where organic rubber fails or deteriorates
prematurely. Performance characteristics include higher levels of resistance to the
effects of temperature, fire, ozone and corona, weathering and fungus, among others. The
extrusions also feature inertness properties and low compression set. Groendyk
Manufacturing Company, Inc, Buchanan, VA.
Ultra-high molecular weight elastomer. Keltan 7441A is an
ultra-high molecular weight, high ENB, oil extended EPDM with the optimum molecular
structure for dynamic applications. Developed in collaboration with companies in the
automotive industry, it enables compounds based on this polymer to be almost equivalent in
dynamic resilience to NR compounds of similar hardness. They provide strength and fatigue
resistance plus durability at high operating temperatures. DSM Elastomers, Addis,
LA.
Vynaprene material. Free samples are available of this new
material, which offers the durability and feel of leather at the cost of vinyl. Designers
can double-dip these grips for increased durability while adding the value of 2-color
designs. The 1-piece construction will not crack or come apart. Grips can be stamped or
imprinted, even in multi-colors. Applications include hand tools, holsters, lawn and
garden, and fitness equipment. GripWorks, St. Louis, MO.
Thermoplastic vulcanizates. FORPRENE the rmoplastic vulcanizate
(TPV) elastomers consist of a polyolefin phase with a cross-linked
ethylene-propylene-diene monomer (EPDM) rubber phase dispersed throughout. This provides
rubber-like properties (softness, elastic memory and flexibility), but with the advantage
of melt-processability inherent to a thermoplastic. The product's broad Shore hardnesses
range from 35A to 60D. M.A. Hanna Company, Cleveland, OH. 
Isocyanate-free compounds. The Evergreen Series of mold rubber
compounds contains no free isocyanates, TDI, MDI, MOCA or mercury. They were developed in
response to customer requests for urethane mold rubbers that are both user and
environmentally friendly. Available in Shore A hardnesses of 10, 20, 30, 40, 50 and 60,
they do not shrink, and feature convenient mix ratios of either 1A:1B or 2A:1B by volume. Smooth-On
Inc, Easton, PA.