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. 100% Polypropylene white base sheets that are acid, base and solvent resistant, thermally bonded with no glue or binding and straight, clean, knife-cut edges with minimal lint.