Silica (SI-S) Supra-Clean Spherical Silica-based Solid Phase Extraction (SPE) products are recommended for extracting polar compounds when analyzing aldehydes, amines, pesticides, herbicides, carotenoids, fat soluble vitamins, baflatoxins, fatty acids, and phospholipids. Cartridges are available in a variety of media weights. SPE Format: Cartridge Media Weight: 700 mg Quantity: 50