The influence of (Methylene glycol, ethylene glycol, 1, 4 butanediol as well as of water on the height and rate of rise and temperature during the foaming process of microcellular elastomers used in RIM technology has been studied. The presence of chain extenders in the foaming process leads to an increased mass reactivity of the system. Up to a certain water concentration, the chain extender process is predominant. At higher H2O concentrations the blowing reaction is the more significant process.
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