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Rulon Bearings

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BCC Products BC 8690E Polyurethane Elastomer
Categories: Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane, Elastomer, Unreinforced; Rubber or Thermoset Elastomer (TSE)

Material Notes: BC 8690E is a two-component urethane elastomer compound specifically designed for casting applications. This product is a safe, easy-to-handle, room temperature mixing and curing system that contains no TDI, MDA or MOCA. BC 8690E is insensitive to moisture during storage and normal handling; hence, this system will make dependably good void-free parts without the foaming problems that some conventional urethane systems exhibit. The low shrinkage, low viscosity, superior toughness, and excellent detail reproduction of BC 8690E makes this system ideal for general purpose castings and quality tooling operations. Uses: mold Fabrication, shock absorbent pads & liners, adhesive for high strength and resilient bonds, and many types of urethane rubber parts.

Information provided by BCC Products, Inc.

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Physical PropertiesOriginal ValueComments
Specific Gravity 1.07 g/cc
Brookfield Viscosity 2500 cP
@Temperature 23.9 °C
mixed
Linear Mold Shrinkage 0.0025 cm/cm
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 85 - 90
Tensile Strength, Ultimate 2700 psi
Elongation at Break 550 %
Tear Strength 390 pli
 
Processing PropertiesOriginal ValueComments
Cure Time 240 - 360 mindemold time
 4320 - 7200 minfull cure
Working Life 20 min
@Temperature 25.0 °C
100 g
Gel Time 30 min
@Temperature 25.0 °C
218 g
 
Descriptive Properties
Mix Ratio100:55 by weight, 185:100 by volume (resin/hardener)

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