A reusable hot melt molding compound. A reusable hot melt molding compound. A reusable hot melt molding compound. A reusable hot melt molding compound. it is a highly plasticised flexible PVC that is non-toxic. Melting temp.338F. Combining flexibility with strength for moulds to be used in making concrete articles. Best resistance to damage through rough treatment. Shore 00 hardness 47