... ,thin-wall tube,elastic belt and unsintered ta PTFE FINE POWDER DF-201 Excellent Grade A Qualified Smoothness & Cleaness ... sheet surface,fiber is average,no gravel and metalic powder,even sheet texture ≤1 for mechanical impurity(≥0 ... sheet surface,fiber is average,no gravel and metalic powder,allow 0.5mm organic Impurity. 2 Tensile Strength,(Mpa ... to make the resin bind together. PTFE fine powder DF-201