high quality silicon carbide rod as heating element; intelligent auto-control temperature system, SCR control, phase shifting trigger. The furnace chamber is adopted the 1600 type imported polycrystalline alumina fiber. It is equipped with intelligent cooling System between the dual shell, when the surface temperature reach to 50℃, the cooling fun will be start working automatically, so it can ensure the surface temperature is low; Using constant current soft-start control, to extend the life of heating elements