Abstract
The term ‘liquid polyurethane elastomer systems’ is used in this chapter to refer to chemical systems which are cast by pouring techniques into moulds for the purpose of fabricating products. The technology of reaction injection moulding (RIM) or liquid injection moulding (LIM) or one-shot processes will be described in a separate chapter. Normally, polyurethanes to be fabricated directly from their low molecular weight components are sold as complete chemical systems based on the prepolymer or quasiprepolymer system. There are relatively few original prepolymer systems manufactured and all have their own trade name; these in turn have been bought by secondary chemical manufacturing companies, possibly subjected to modification, and then resold under a different trade name although this material is more or less identical to the original.
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