The item for sale is 3 Lb (48 Ounces) of Silicon Dioxide (SiO2). The item for sale is 3 Lb (48 Ounces) of Silicon Dioxide (SiO2). Silicon Dioxide, also known as Silica, is a naturally occuring oxide of silicon. Bottles are made of durable Polypropylene Plastic, which is a natural, translucent, lightweight, durable, and chemically resistant copolymer. The screw-top is completely leakproof. Bottle is sealed in plastic with the screw-top shrink-wrapped. HUNDREDS OF USES INCLUDING: Silicone Anti-Stick Dusting, Anti-Caking agent, Mold Release, Structural Materials, Microelectronics, Electrical Insulator, Food and Pharmaceuticals.