We have been in the field for the gas-insulated switchgear aluminium housing (GIS housing/shell/cover from aluminium) for more than 20 years, we have the most advanced casting process （low pressure melting）, inspecting equipment for strict quality control such as spectrum, X-rays, SF6 anti-leaking test maching, CMM and so on. In GIS field, we have gained good credit, and had continuous cooperation with some big companies such as ABB, GG, SY et..