BCC Products BX-31 Urethane Elastomer

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BCC Products BX-31 Urethane Elastomer
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	Applications: BX-31 is used to make molds of masters that contain moderate undercuts. BX- 31’s physical properties make it ideal for making detailed concrete molds, patterns and formliners. Characteristics: 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? 2, 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. Information provided by BCC Products, Inc.
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Physical Properties	Original Value	Comments

Density	8.23 lb/gal	Curative (Part B)
	8.46 lb/gal	Iso (Part A)
Viscosity	325 - 375 cP	Curative (Part B)
	900 - 1100 cP	Iso (Part A)
Storage Temperature	16.0 - 32.0 °C

Mechanical Properties	Original Value	Comments
Hardness, Shore A	29 - 33
Tensile Strength	>= 300 psi	ASTM D412
Elongation at Break	>= 1000 %	ASTM D412
Tear Strength	16.0 - 24.0 pli	split; ASTM D470
	>= 70.0 pli	Die C; ASTM D624-C

Processing Properties	Original Value	Comments
Cure Time	1.00 - 2.00 min	Mix Time
	24.0 hour	Demold Time
	72.0 hour	Complete Cure Time
Pot Life	20.0 - 25.0 min
Gel Time	25.0 - 35.0 min
Shelf Life	6.00 Month	Iso (Part A)
	6.00 Month	Curative (Part B)
	6.00 Month

Descriptive Properties
Color	Clear light yellow to amber	Iso (Part A)
	Opaque light yellow	Curative (Part B)

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PBCC113 / 250978

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