... ,thin-wall tube,elastic belt and unsintered ta PTFE FINE POWDER DF-201 Excellent Grade A Qualified Smoothness & Cleaness White sheet ... ) White sheet surface,fiber is average,no gravel and metalic powder,allow 0.5mm organic Impurity. 2 Tensile Strength,(Mpa)≥ 24 ... quality certificate,on which there are brand,trademark,executive criterion.type,grade,lot NO.and net content,pack date, checker,,packager ...