STANDARD METHODS OF TESTING URETHANE FOAM ISOCYANATE RAW MATERIALS
|Publication Date:||27 June 1974|
These methods cover procedures for testing the isocyanate raw
materials used in preparing urethane foams. The isocyanates covered
are toluenediisocyanate (purified) and modified or crude
isocyanates derived from toIuenediisocyanate or crude
The values stated in SI units are to be regarded as the standard.
NOTE 1-Urethane foams are cellular products that vary from soft resilient types to those which are hard and rigid. These foams are made by the interaction of polyhydroxy compounds, water, and an organic polyi- socyanate. The reactions involved in the manufacture of these foams can be modified in many ways. Basic materials, especially tertiary amines, act as catalysts and accelerate the reaction, whereas acidic materials retard it. The uniformity and size of the cells are affected by the addition of surface-active agents. Usually nonionic or cationic surfactants are employed. Fillers, plasticizers, and colors are also added in many cases to give specific properties to the foam.