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. W4 Wipers are doubled-bagged with a case liner. This product is sold as 5 x 100 white sheets (500 total). Individual sheet size 30.4cm (L) x 30.4cm (W).