... .Material:SS302#\304#\316#\316L... 2.Usage:plastic extruder Description of Filter Discs for Double-screw Extruder:Material: SUS202, 302, 304, 304L, 316, 316L ... 20 to 1000 meshes.Features:resistance to acid, soda, corrosion, high temperature etc.Appication: Specially used in Double-screw Extruder.