PTFE Glass-Filled – Milled glass fibers have the least effect on chemical and electrical properties and add greatly to the mechanical properties of unfilled PTFE. Addition of glass improves compressive properties by as much as 40% and improves wear resistance greatly. These compounds resist acids and oxidation but can be attacked by alkali. PTFE with 25% glass fibers for increased stability is supplied in sheets, rods & tubes. Available in Standard 25% Glass Filler. Also available in 15%, 20%, and other custom blends. Glass-Filled PTFE has a Typical 2-3 Week Lead-Time. If faster delivery is required, please contact customer service