ComposiMould Reusable Moulding Material Non Toxic, Microwaveable, and Reusable Over 35 Times ComposiMold is a 100% reusable mould making material that works by melting and pouring. Many casts can be made using the same mould. ComposiMold is good for the mould maker and craft artist because it can be reused to make different moulds without worrying about wasting mould making material. ComposiMold is an excellent material for those wanting to learn and become involved in sculpting, modelling, and mould making without having to worry about mistakes or wasting material. ComposiMold is a flexible, rubbery, thermoplastic that is great for small mould parts using many different casting materials including plaster, cement, epoxy, polyurethane, and many others. ComposiMold-Original conforms to ASTM D4236, Safe as an art material.