Silpak RU-320 Rapid Curing Urethane Castable Rubber

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Silpak RU-320 Rapid Curing Urethane Castable Rubber
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	RU-320 is a two-component, fast-setting polyurethane rubber that cures at room temperature (RTV) and has a 1 to 1 mix ratio. It has a hardness of Shore A25. RU-320 Urethane Rubber is a low viscosity system which cures to provide an elastomer with high strength properties. This product is excellent for prototyping and model making applications and for the casting of production parts, props, tools, and more. Features: Easy 1A:1B Mix Formulation Low Shrinkage on Cure Rapid Demold Time Reproduces Fine Detail Low Viscosity Room Temperature Curing (RTV) Applications: Any application where a flexible rubber part is required: Prototype and Model Making Props Tools Production Parts Information provided by Silpak a division of Polytek Development Corp.
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Physical Properties	Original Value	Comments

Specific Gravity	1.01 g/cc
Viscosity	975 cP	Initial Mixed
Storage Temperature	60.0 - 90.0 °F

Mechanical Properties	Original Value	Comments
Hardness, Shore A	25
Tensile Strength	180 psi
Elongation at Break	500 %
Tear Strength	447 pli

Thermal Properties	Original Value	Comments
Shrinkage	0.50 %	Upon Cure

Processing Properties	Original Value	Comments
Cure Time	0.500 hour @Temperature 70.0 °C	Demold
	2.00 hour @Temperature -13.9 °C	Demold
	16.0 hour @Temperature 60.0 °C
Shelf Life	6.00 Month

Descriptive Properties
Color	Opaque/Tan
Mix Ratio	1A:1B	by weight
Pour time	4 min	1-lb mix
Specific Volume	27 in3/lb

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PSILPAK003 / 318640

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