1)High adsorption property 2)Eco-friendly silica gel 3)in accordance to U.S standar 4)DMF Free 1.It extracts from ... and long-term way for its stable chemical properties. 4, High-quality, Environment friendlyProduct, SUNRISE, is made of activated silicon which was ... non-corrosive, it is approved by the United States FDA to be used for food and pharmaceutical industries. high quality silica gel