1.Supply Free samples 2.Good quality,price&service 3.ISO,SGS,MSDS,COA 4.Black powder/granular ... %_PH Value7±1.5Heating Loss % ≤1.5Ash Content % ≤0.745um mesh % ≤0.1ImpurityNoFines Content % ≤7Modulus at 300% Mpa-2.6±1 ... quanlity of carbon black n115,n121,n234,n326,n539,n762 with competitive price,black carbon