Polyurethane RIM systems are reinforced with inorganic materials to improve stiffness and structural integrity at elevated temperatures and to reduce the coefficient of thermal expansion. This work describes the reinforcement obtained with an experimental grade of mica designed to achieve low viscosity in polyol mica suspensions. The effect of mica on properties is essentially identical to that of glass flake. Compared to hammer milled glass, mica and glass flakes yield more isotropic, albeit weaker, materials.
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