Square Bottom Covers are made with the same virgin- grade materials as our cleanroom films and are tested to ensure they meet the requirements of an ISO 14644 Class 5 (FED STD 209E-Class 100) cleanroom environment. Covers can be made from any of our polyethylene grades including LDPE, Cleantuff®, ULO®, anti-static poly (both clear and pink), UVI (black, white, or clear), in addition to several custom colors to fully meet your customer’s requirements.