1973年以来,我国各地开始利用有机和无机材料试制新型的复合材料,以代替木材、纸张。这种新材料通称为钙塑材料,两年来已取得显著成绩。北京正在试制高发泡保温板材,准备在建筑物的内墙试用。板材容重为0.2克/立方 Since 1973, various types of organic and inorganic materials have been used in China to trial-make new types of composite materials to replace wood and paper. This new material is known as calcium plastic material and has achieved remarkable results in the past two years. Beijing is experimenting with high-foam insulation boards and is preparing to try them on the interior walls of buildings. Board bulk density 0.2 g/cubic