Pur-Sheet is the Ultimate Answer. Pur-Sheet is manufactured with advanced technology for the processing & packaging of botanical extractions, resulting in complete purity & integrity of finished concentrates. Pur-Sheet & Rap-Sheet are manufactured with the highest quality materials in PTFE & FEP films. We supply the best and most durable material available on the market. 100% PURE, FDA COMPLIANT, completely silicone free, replaces the use of inferior parchments papers, 100% GUARANTEED to prevent extract contamination & inhibits bleed through, 100% PHARMACEUTICAL GRADE, high performance, rated upto 450 degrees Fahrenheit, 100% RESISTANT to polar and non-polar solvents, impervious to hydrocarbons, acids and bases. For use in full scale production of botanical extracts, packaging, lab, liners, rosin presses & vacuum ovens and double bar heat sealers/cutters.