Northstar Polymers MGB-A90A High Performance Polyurethane Cast Elastomer System 90A

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Northstar Polymers MGB-A90A High Performance Polyurethane Cast Elastomer System 90A
Categories:	Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane, Liquid
Material Notes:	This is a PTMEG/MDI base high-performance polyurethane casting system. This system is recommended to applications in which the part requires high rebound, slide abrasion, constant water contact and high elongation. Possible application for this material includes roller skate wheels, bumpers, abrasion resistant liners, rock/sand sizing screens and other specialty applications. This is a conventional “full-prepolymer” type material cured with 1,4 BDO. Can be approved for FDA dry food contact. Information provided by Northstar Polymers.
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Mechanical Properties	Original Value	Comments

Hardness, Shore A	90	ASTM D2240
Tensile Strength	3610 psi	ASTM D412
Elongation at Break	840 %	ASTM D412
100% Modulus	1.46 ksi @Strain 100 %	ASTM D412
Rebound	62 %	Bashore Rebound; ASTM D2632
Tear Strength	134 pli	Split; ASTM D624
	560 pli	Die C; ASTM D624
Taber Abrasion, mg/1000 Cycles	35	ASTM D4060

Processing Properties	Original Value	Comments
Processing Temperature	77.0 °F	Curing Agent Temperature
	180 - 200 °F	Prepolymer Temperature
Mold Temperature	180 - 200 °F
Cure Time	0.500 hour @Temperature 93.3 °C	De-mold Time
	16.0 hour @Temperature 82.2 °C	Complete Cure Cycle
Pot Life	2.50 - 3.00 min

Descriptive Properties
Curing Agent	BNA-005
Prepolymer	MGA-048
Weight Ratio	1:0.089	Prepolymer to Curing Agent Ratio

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