... ,smelting We selects 1.2D,2D and 2.5D polyester fiber, and they will produced with advanced equipment which ... product possess high porosity,good permeability,high effective dustcollecting,long using-life etc. Common character as ordinary filter felt have. ... acid and anti-alkali, especially its excellent anti-abrasion, polyester needle punched filter felt have the largest quantity of turnouts ...