Designed for the semiconductor industry, the PROSAT® Si utilizes a contamination control fabric from DuPont which is the cleanest non-woven wiper available. The substrate is made from 100% polyester fiber which is hydroentangled into an extremely soft, clean and strong fabric which is very low in both particles and extractables. The solvent blend of 10% 2-propanol and 90% deionized water combines cleaning effectiveness with safety. The solvent solution is filtered through a 0.2m filter and meets all SEMI specifications for metals and contaminants. ISO Class 5 compatible. Shipping weight: 64 Lbs.