BJB Enterprises TC-872 A/B Rigid Polyurethane Casting System

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BJB Enterprises TC-872 A/B Rigid Polyurethane Casting System
Categories:	Polymer; Thermoset; Polyurethane, TS
Material Notes:	TC-872 A/B is a RoHS compliant, non-mercury based catalyst polyurethane system that produces a tough 70 shore D material. This system has an exceptionally high impact and a high heat deflection temperature which in some cases can be post cured without having to use fixtures. Features: High heat resistance, High Impact, Non-mercury, RoHS/REACH compliant, Working time of 10-12 minutes.
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Physical Properties	Original Value	Comments

Specific Gravity	1.06 g/cc @Temperature 25.0 °C	Part A
	1.16 g/cc @Temperature 25.0 °C	Part B
Density	1.13 g/cc	ASTM D792-00
Brookfield Viscosity	650 cP @Temperature 25.0 °C	Part B
	750 cP @Temperature 25.0 °C	Mixed
	830 cP @Temperature 25.0 °C	Part A
Linear Mold Shrinkage	0.0040 in/in	12”x ½” x ½”
Storage Temperature	65.0 - 80.0 °F

Mechanical Properties	Original Value	Comments
Hardness, Shore D	68 - 72	ASTM D2240-04e1
Tensile Strength	3310 psi	ASTM D638-03
Elongation at Break	28.3 %	ASTM D638-03
Tensile Modulus	71350 psi	ASTM D638-03
Flexural Strength	3315 psi	ASTM D790-03
Flexural Modulus	84680 psi	ASTM D790-03
Izod Impact, Notched	1.78 ft-lb/in	ASTM D256-05

Thermal Properties	Original Value	Comments
Deflection Temperature at 0.46 MPa (66 psi)	240 °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	10.0 - 12.0 min @Temperature 25.0 °C	100 g.
Gel Time	13.0 - 15.0 min
Shelf Life	6.00 Month	Stored at recommended temperatures. Purge opened containers with dry nitrogen before resealing.

Descriptive Properties
Color / Appearance	Amber	Part B
	Colorless	Part A
	Translucent Pale Yellow	Cured
Demold Time (hrs)	2 - 3	@ 77°F
	2 - 3
Mix Ratio by volume	100 to 32	Part A to Part B
Mix Ratio by weight	100 to 35	Part A to Part B

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PBJB9904 / 287685

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