Urethane o rings are also named as polyurethane o ring or cast urethane. urethane is a thermoplastic elastomer formed by reacting a polyol with a diisocyanate in the presence of suitable catalysts. urethane rubber is widely used in drive belts, hydraulics fuel due to its high strength, and excellent tear. <a href="http://www.w3schools.com/html/">Urethane o rings</a> also provides excellent permeation resistance.
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