Poly 72 Series Part C is an additive that can be added to the Polyfast 72-40 to reduce the Shore A hardness.
A liquid softener for Poly-Fast 72-40. Can be added to create rubbers as soft as a Shore A~6. Part C should be weighed and thoroughly mixed with 72-40 Part B before adding A. Each 20 parts of C added to 100 parts total A+B lowers the hardness by about 10-15 Shore A points.
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