... cleaning,high temperature resistant,anticorrosion,water and oil repellent,anti-oxidation,high filtration efficency,and long service life. (B) ... Product parameters:1) Material: polyester/PTFE 2) Weight: 500gsm3) Thickness: 1. 8mm 4) Air ... a) Continuance: 130. b) Instant: 1608) Surface treatment: Heat singeing, coated (C) Process flows :Willey——Carding-machine——Lapping machine ...