tungsten carbide mechanical seal ring 1,Original material 2,Over 10years experience. 3,ISO certificate tungsten carbide mechanical seal ringGrade Recommend GradeDensity g/cm3Hardness HRA(hv)T.R.S(M Pa)Performances &applications recommendedYG614.989.52150Good Wear resistance, used for hard wood,processing original wood,aluminum section bar,brass rod and cast iron.YG814.6892320Suitable for the ...