BCC Products BC8321 Urethane Elastomer System

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BCC Products BC8321 Urethane Elastomer System
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	Applications: BC8321 is used to make soft molds of detailed masters that contain deep undercuts. Some of the most common uses are concrete formliners and to make molds for point-of-purchase displays, rapid prototypes, special effects, taxidermy, and sculpture reproductions.BC8321 Softener Part C can be used to reduce the hardness below 10A. Characteristics: BC8321 is a two-part polyurethane molding system. BC8321 is mixed one-to-one by volume (or 100 Iso Part A to 98 Curative Part B by weight) and cures at room temperature. BC8321 contains no fillers and cures to a soft (Shore A19 ±2), dark purple rubber. Information provided by BCC Products, Inc.
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Physical Properties	Original Value	Comments

Density	0.980 g/cc	Softener Part C
	0.990 g/cc	Curative Part B
	1.02 g/cc	Iso Part A
	8.20 lb/gal	Softener Part C
	8.25 lb/gal	Curative Part B
	8.50 lb/gal	Iso Part A
Viscosity	140 cP	Softener Part C
	400 cP	Curative Part B
	700 cP	Iso Part A
Storage Temperature	70.0 - 80.0 °F

Mechanical Properties	Original Value	Comments
Hardness, Shore A	12 - 16	Cured Product Standard mix + 50 pbw Part C *
	17 - 21	Cured Product Part A + Part B
Tensile Strength, Ultimate	150 psi	Cured Product Standard mix + 50 pbw Part C *
	260 psi	Cured Product Part A + Part B
Elongation at Break	>= 1000 %	Cured Product Part A + Part B
	>= 1000 %	Cured Product Standard mix + 50 pbw Part C *
Tear Strength	14.0 pli	Die C, Cured Product Part A + Part B
	14.0 pli	Die C, Cured Product Standard mix + 50 pbw Part C *
	150 pli	Split, Cured Product Standard mix + 50 pbw Part C *
	260 pli	Split, Cured Product Part A + Part B

Processing Properties	Original Value	Comments
Cure Time	1.00 - 2.00 min	Mix
	24.0 hour
	24.0 hour	Demold
Pot Life	30.0 - 35.0 min
Gel Time	40.0 - 50.0 min
Shelf Life	6.00 Month	Iso Part A
	6.00 Month	Curative Part B
	12.0 Month	Softener Part C

Descriptive Properties
Color	Clear	Softener Part C
	Clear to Light Amber	Iso Part A
	Dark Purple	Curative Part B
	Dark Purple	Cured Product Part A + Part B
	Dark Purple	Cured Product Standard mix + 50 pbw Part C *
Mix ratio	100:98	Iso Part A/Curative Part B
	variable	Softener Part C

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PBCC126 / 250991

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