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日本两家公司共同研制出一种新型混凝土的外壁材料。它是把水泥同苯乙烯丁二烯橡胶在真空状态下混合，然后注射成型．其强度比～般混凝土外壁材料高出10倍以上，内部密度与大理石大致相当，不透水。对于提高住宅的品质与寿命大有好处。这种外壁材料，水泥同苯乙烯丁二烯橡胶的
Two Japanese companies jointly developed a new type of concrete outer wall material. It mixes cement with styrene butadiene rubber under vacuum and then injection molding. Its strength is more than 10 times higher than that of ordinary concrete outer wall materials. The internal density is roughly equivalent to that of marble, impervious to water. It is of great benefit to improve the quality and longevity of homes. This outer wall material, cement with styrene butadiene rubber