BJB Enterprises TC-878 A/B Rigid Polyurethane Casting System

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BJB Enterprises TC-878 A/B Rigid Polyurethane Casting System
Categories:	Polymer; Thermoset; Polyurethane, TS
Material Notes:	TC-878 A/B produces a high impact rigid 78 Shore D material with excellent heat resistance. This product is a clear casting system that is easy to tint or pigment. TC-878 A/B can be easily processed by hand or meter-mix dispense equipment.
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Physical Properties	Original Value	Comments

Specific Gravity	1.03 g/cc	Part B
	1.08 g/cc	Part A
Density	1.09 g/cc	ASTM D792-00
Brookfield Viscosity	600 cP @Temperature 25.0 °C	Part A
	1250 cP @Temperature 25.0 °C	Mixed Part A & Part B
	1625 cP @Temperature 25.0 °C	Part B
Linear Mold Shrinkage	0.0050 in/in	12”x ½” x ½”
Storage Temperature	65.0 - 80.0 °F	Purge opened containers with dry nitrogen before re-sealing.

Mechanical Properties	Original Value	Comments
Hardness, Shore D	76 - 80	ASTM D2240-04e1
Tensile Strength	4230 psi	ASTM D638-03
Elongation at Break	155 %	ASTM D638-03
Tensile Modulus	127000 psi	ASTM D638-03
Flexural Strength	5060 psi	ASTM D790-03
Flexural Modulus	129000 psi	ASTM D790-03
Izod Impact, Notched	1.23 ft-lb/in	ASTM D256-05

Thermal Properties	Original Value	Comments
Deflection Temperature at 0.46 MPa (66 psi)	190 °F	ASTM D648-04
Deflection Temperature at 1.8 MPa (264 psi)	145 °F	ASTM D648-04

Processing Properties	Original Value	Comments
Processing Temperature	<= 200 °F	Max cure temp.
Cure Time	1.00 - 3.00 hour @Temperature 25.0 °C	Step 1 recommended high temp cure (as tested).
	16.0 hour @Temperature 82.2 °C	Step 2 recommended high temp cure (as tested).
	120 - 168 hour @Temperature 25.0 °C	Optional low temp cure
Working Life	15.0 min @Temperature 25.0 °C	100 g.
Gel Time	>= 25.0 min
Shelf Life	6.00 Month	Stored at recommended temperatures.

Descriptive Properties
Color / Appearance	Colorless	Part A
	Pale yellow	Part B
	Pale yellow / clear	Cured
Demold Time (hrs)	8 - 10	@ 77°F. Faster de-molds can be achieved by pre-heating
Mix Ratio by volume	100	Part B
	81	Part A
Mix Ratio by weight	85 to 100	Part A to Part B

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PBJB9902 / 287683

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