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BX-31 30 Shore A Elastomer For Concrete Casting

BX-31 is a two-part polyurethane molding system. BX-31 is mixed 100iso:97curative by weight (or 1 Pt-A Iso to 1 Pt-B Curative by volume) and cures at room temperature. BX-31 cures to a low hardness, Shore A 31 light yellow rubber. Ultimate properties are obtained after 3-4 days of room temperature cure. Cure can be accelerated with heat (130-150°F for 12-16 hours) but a slightly harder polymer (34 +/- 2 Shore A) and slight shrinkage will be obtained.

Product Features:

Preliminary Physical Properties

Split tear, pli (ASTM D470) 20 +/- 4

Die C Tear, pli (ASTM D624-C) 70 minimum

Tensile, psi (ASTM D412) 300 minimum

Elongation, % (ASTM D412) >1000

Final Hardness, Shore A 31 +/- 2

Viscosity, Iso Side A, cPs 1000

Viscosity, Curative Side B, cPs 350

Gel Time, minutes 30 +/- 5


Mix time, pot life, gel time, cure time, and demold time vary depending on mass and component temperature. The table above explains the properties of BX-31 after it has thoroughly cured. Physical test data presented here are representative of typical values but are not material specifications.


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