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Polyurethane was researched and developed first by GERMANY. Bayer of GERMANIC made use of diphenylmethane discocyanate to acquire polyurethane in 1937, and realized the polyurethane industrialization after world war II. Polyurethane industry especially came into wide use in 1950's. Polyurethane foam is a new building material of high technology and applicable for sealing and adhibiting around windows, doors, fill cracks, joints, gaps around concrete. It has so many functions such as waterproof, heat preservation, fireproof, also harmless for human health and no environment pollution. Polyurethan could stick with cement, mineral wool, etc. without leakage.