DIN EN 772-21:2011
砌塊產品的試驗方法.第21部分粘土和硅酸鈣砌塊吸水性(冷水吸收)的測定;德文版本EN 772-21-2011
Methods of test for masonry units - Part 21: Determination of water absorption of clay and calcium silicate masonry units by cold water absorption; German version EN 772-21:2011