... powder chemical product 2The resin is suitable for making capillary tube,thin-wall tube,elastic belt and unsintered ta PTFE FINE POWDER ... fiber is average,no gravel and metalic powder,even sheet texture ≤1 for mechanical impurity ... surface,fiber is average,no gravel and metalic powder,allow 0.5mm organic Impurity. 2 Tensile ... 2.PTFE should be stored in clean dry warhouse to prevent from dust,moisture,etc, ...