... crucible in jewelry casting industry. Graphite sealing rod / graphite stopper:Graphite sealing rod function: used as a stooper when ... strength: 65mPa Shore hardness: 55 Porosity: 15% Graphite rod equipments: At least 20 machinery for processing the crucibles. ... services after using and rapid delivery capacity. graphite stiring rod,graphite sealing rod,graphite stopper,jewelry tools,gold melting tools