Reynolds Smooth-Cast® 385 Mineral Filled Urethane Casting Resin

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Reynolds Smooth-Cast® 385 Mineral Filled Urethane Casting Resin
Categories:	Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane, Elastomer, Unreinforced
Material Notes:	Product Overview: Smooth-Cast™ 385 is a mineral filled urethane casting resin that is very hard and durable. When Parts A and B are mixed in proper proportion (1A:5B by weight), Smooth-Cast™ 385 cures at room temperature with virtually no shrinkage. This rigid urethane casting resin has high compressive and flexural strength. Fully cured castings are tough, machinable and paintable. Color effects are possible by adding pigment dispersions. They resist moisture and mild solvents. Smooth-Cast™ 385 is ideal for making industrial production parts, foundry patterns, vacuum forming molds, and some ceramic applications. Information provided by Reynolds Advanced Materials
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Physical Properties	Original Value	Comments

Specific Gravity	1.60 g/cc	ASTM D-1475
Viscosity	3000 cP	Mixed; ASTM D-2393
Linear Mold Shrinkage	0.00060 in/in	ASTM D-2566

Mechanical Properties	Original Value	Comments
Hardness, Shore D	85	ASTM D-2240
Tensile Strength, Ultimate	3100 psi	ASTM D-638
Elongation at Break	1.0 %	ASTM D-638
Tensile Modulus	400000 psi	ASTM D-638
Flexural Strength	5900 psi	ASTM D-790
Flexural Modulus	433000 psi	ASTM D-790
Compressive Strength	8500 psi	ASTM D-695
Compressive Modulus	400000 psi	ASTM D-695

Thermal Properties	Original Value	Comments
Heat Distortion Temperature	57.0 °C	ASTM D-648

Processing Properties	Original Value	Comments
Cure Time	2.00 hour	Handling Time
Pot Life	20.0 min	ASTM D-2471

Descriptive Properties
Color	Beige
Mix Ratio	1A:1B	by weight
Specific Volume	17.3	[cu. in./lb.]

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