One-stop sourcing of Tungsten ring. Tungsten has the highest melting point of all ... of linear thermal expansion at 20 °C4.2 · 10-6 [m/(m·K)]Thermal conductivity at 20 °C 164 ... of linear thermal expansion at 20 °C5.2 · 10-6 [m/(m·K)]Thermal conductivity at 20 °C142 ... extracting, , machinery processing, glass and ceramic industries, etc. 4. SMT’s advantage in furnace components1)Large size, high purity ...