... friendly silica gel 3)in accordance to U.S standar 4)DMF Free 1.It extracts from natural quartz sand, ... widely used in drug purification, DNA separation, food drying, high-precision electronics, senior cosmetics, sewage purification, beer purification, advanced ... long-term way for its stable chemical properties. 4, High-quality, Environment friendlyProduct, SUNRISE, is made of activated silicon ...