Hydrolytic Stability of Two New Polyurethane Potting Compounds
NAVAL ORDNANCE LAB WHITE OAK MD
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Two new urethane potting compounds have been prepared by crosslinking an hydroxyl- terminated 1,2-polybutadiene with trifunctional isocyanates. The low volatility of the isocyanates used in the process reduces the toxicity and preparation hazards considerably. The results of tests on these compounds indicate that they have much greater hydrolytic stability than previously used materials. The electrical resistance of the samples were measured at 50 and 500 volts in order to detect any deterioration of the electrical properties of the resins during the high humidity exposure.