PT Flex 20 Liquid Rubber is a two-part, liquid polyurethane system that cures (RTV) to a tan, Shore A23-25 rubber. Once Cured would be perfect for prototyping.
 
Technical Specifications
 
Mix Ratio by Weight: 1A:1B
Shore Hardness: A20
Pour Time: 4 min.
Demold Time: 2 hr.
Cured Color: Tan
Mixed Viscosity: 520 cP
Specific Volume: 27.5 in³/lb
Specific Gravity: 1
Elongation: 70 %
Tensile Strength:250 psi
Die C Tear Strength: 50 pli