One-top sourcing of refractory metal parts. Tungsten has the highest melting point of ... the most intense heat. 1.Tungsten electrodes for vacuum furnace:Chemical composition: tungsten >99.95% ( percentage by ... 3.Main applications:sapphire single crystal growth furnace, metallurgical industry furnace, vacuum furnace, high temperature furnace, silicon industry furnace, quartz glass, metal extracting, , ...