Ideally suited for ISO Class 4 or higher clean rooms. One-step application of alcohol to critical surfaces. Use for surface wiping in clean room environments. 100% polypropylene base sheet. 70% isopropyl alcohol/30% deionized water.- KIMTECH PURE W4, CL4 PreSat Alcohol Wipe, White, 9" x 11", 40/pk, 10 pk/cs (Item is considered HAZMAT and cannot ship via Air or to AK, GU, HI, MP, PR, VI)