Shop for PCTFE sheets. PCTFE commonly referred to as Kel-F® or Neoflon®, is a fluoropolymer material with outstanding strength, stiffness, and dimensional stability. PCTFE has excellent chemical resistance, radiation resistance, and flammability characteristics. It is resistant to cold flow and has the lowest coefficient of thermal expansion of any unfilled fluoropolymer. FDA compliant grades available. Standard sizes available. Custom cuts, cut-to-size. Have machined into fabricated parts. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.