Unfortunately the polyurethane industry followed the standard way that rubber has always been specified. These do not represent the most usable data (e.g., the results from differential thermal mechanical analysis (DTMA) can provide many relationships that are more useful). Manufacturers normally supply details of their materials in a three-zone layout:
◾ Prepolymer properties ◾ Processing information ◾ Cured materials properties
There is similar information supplied for quasiprepolymers and for different curatives. Some important facts are:
◾ Different tests give different results. ◾ Resilience, tear, and wear testing have large variations.