1,Size:4.5*8CM 2,Strong paper with tyvek paper 3,With four contry's words 4, In accordance to SGS ,ROSH,MSDS,and DMF Characteristic Silica gel is a high absorbent. Exposing in the air (RH 80%-90%, 25°C) 7 hours, it can absorb 35-39% water. The silica gel is made by people with the Na2SiO2 and chemical relative. The character is a lot of holes in inner, the outside structure is the anomalistic ...