Polytek 75-79 Firm, Flexible Polyurethane Rubbers

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Polytek 75-79 Firm, Flexible Polyurethane Rubbers
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	Description: Poly 74-Series Liquid Rubbers consist of two parts (A and B), which, after mixing, cure at room temperature to flexible, high-strength, mold rubbers. Poly 74-Series Rubbers make durable, easy-releasing molds for casting plasters and waxes without release agents. When Poly 74-Series molds are properly prepared, they are also excellent for casting concrete and various resins, such as epoxy, polyester, polyurethane and acrylic. Product Line Features: Make durable, long-lasting molds owing to strength and elongation properties of cured rubber Pourable liquid rubbers that cure to soft to mid-range hardnesses Easily thickened for brush-on applications No release agents needed when casting many plasters, waxes and concretes Low-viscosity liquid rubbers capture detail from intricate masters Information provided by Polytek
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Physical Properties	Original Value	Comments

Specific Gravity	1.07 g/cc
Viscosity	2000 cP	Mixed

Mechanical Properties	Original Value	Comments
Hardness, Shore A	80
Tensile Strength	655 psi
Elongation at Break	369 %
Tear Strength	143 pli	Die C Tear

Processing Properties	Original Value	Comments
Cure Time	16.0 hour	Demold Time
	20.0 min	Pour Time

Descriptive Properties
Cured Color	Yellow
Mix Ratio By Weight	2A:1B
Specific Volume	26 in3/lb

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PPTK5044 / 251036

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