CW Apothecary Lye (sodium hydroxide) is packaged in 750ml certified HDPE bottles with child proof lids. Each bottle is 2 lbs. in weight, and food grade quality. Cwapothecary lye is 99% pure lye micro beads; which is slightly more pure than lye flakes. Lye (sodium hydroxide) is also known as Caustic Soda, Lye is a product that is used in the creation of soap, detergent, paper, textiles and drinking water.