... wall tube,elastic belt and unsintered ta PTFE FINE POWDER DF-201 Excellent Grade A Qualified Smoothness & ... sheet surface,fiber is average,no gravel and metalic powder,allow 0.5mm organic Impurity. 2 Tensile Strength ... 350 4 Volume Density,(g/L) 475±100 5 Extrude pressure ( RR100)Mpa 9.7±4.2 6 Average Grain ... pack date, checker,,packager. 2.PTFE should be stored in clean dry warhouse to prevent from dust, ...