Sterile SatPax pre-saturated wipers from Berkshire Corporation help eliminate the health and safety concerns of mixing and storing hazardous liquids. The wipers are made of 55% cellulose/45% polyester (Item #SSP670.001.24) or 100% knitted polyester (Item #SSP1200.003.12). Pre-saturated with 70% isopropyl alcohol (IPA) at a higher saturation level, these wipers are sterilized by cobalt-60 gamma irradiation. There are lot numbers on each pack to meet cGMP requirements for traceability, and certificates of sterility by lot number are available online.