1) Inner tank:stainless steel SUS304-0.5mm
2) Vacuum tube:QB-AL-N/AL-47-1500/58-1800
3) Outer tank:painted steel-0.4mm/aluminum-zinc coated steel-0.45mm/stainless steel SUS304
4) insulation:polyurethane 50mm/60mm
5) Frame:coated galvanized steel-1.5mm/stainless steel SUS430-1.5mm
6) Reflector:aluminum component/stainless steel.