Kimtech® Pure W4 Wipers are a range of high-performance wiper solutions, suitable for ISO Class 4 or higher clean-room environments. They are perfect for dry wiping of critical equipment and surfaces in pharmaceutical, high-tech biotechnology, medical device and food processing industries. These 100% Polypropylene white base sheets are acid, base and solvent resistant. They are also thermally bonded with no glue or binding and have straight, clean, knife-cut edges to minimise lint. W4 Wipers are doubled-bagged with a case liner. Individual sheet size 22.8cm (L) x 22.8cm (W).