... , exothermic welding mould, exothermic welding powder, grounding electrode, GEM and so on. GEM Resistance Reducing Material JSBOUND JB-DAProducts Descriptions Jsbound's ... burying under ground.≤ 0.03mm /year0.0019-0.0034mm /aELIGIBILITY GEM Resistance Reducing Material JSBOUND