Kimtech W4 Pure Cleaning Wipes 100 Wipes White Pack of 5 7646Kimtech Pure W4 Wipers are a range of high performance wiper solutions, suitable for ISO Class 4 or higher clean room environments. Perfect for dry wiping of critical equipment and surfaces in pharmaceutical, high tech biotechnology, medical device and food processing industries. These 100 percent polypropylene, white base sheets are acid, base and solvent resistant. Thermally bonded without glue or binding, the wipes have straight, clean, knife cut