Starflex Sealing India Pvt. Ltd. Manufactures Poly Tetra Fluoro Ethylene - PTFE Sheet. Starflex Sealing India Pvt. Ltd. Manufactures Spiral Wound Gaskets, Sheet based and cut gaskets, Tooth Profile Gaskets, Jacketed Gaskets, Envelope Gaskets, and Gland Packings. The Poly Tetra Fluoro Ethylene - PTFE Sheet is a biaxially oriented PTFE sheet to withstand strong acids. The Poly Tetra Fluoro Ethylene Sheet is suitable for sealing strong acids [except hydrofluoric], solvents, hydrocarbons, water, steam and chlorine.