Poly PT Flex Rubbers are very low viscosity, fast, "casting" polyurethane rubbers most often used to make flexible parts. But, if you need a polyurethane mold made in a jiffy, Poly PT Flex rubbers can do the job. With working times of 5 minutes and demold times of ~1-1.5 hr, these rubbers, which come in hardnesses of A20, 50, 60, 70 and 85; can be the answer to a quick mold. Use the resulting mold like any other Polytek polyurethane mold!