Polyurethane can be manufactured either in a single-component or in a two-component system. In both cases, any water still present may react with the isocyanate forming carbon dioxide gas and leading to the formation of bubbles in the final compound.
PURMOL® is a hydrophilic molecular sieve powder. It is used to remove moisture from polyurethane polymer systems in order to prevent the formation of carbon dioxide. PURMOL® products remove moisture without negatively impacting shelf-life, viscosity etc.
Other types of molecular sieve powder are used as additives for selective adsorption in defined polymer systems, e.g.
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