Teflon® can be chemically treated to allow for engraving or can have additives such as glass, glass fiber (fiberglass), graphite, bronze and many others. The available teflon grade are PTFE, FEP, MFA, PFA, PVDF, ETFE, ECTFE, PCTFE and PVF. Please, note that for PVDF, "tube" and "roll" formats are available to order only.