... grade 3) Outer tank material: Aluminum Galvanized sheet with metal painting 4) Supporting frame: Aluminum with anti-oxidation treatment 5) Isolation ... and best density 40kgs/m3.6) Available sizes: 16,18, 20, 24, 30, 36,42 tubes 7) Capacity of water tank from ... grade 3) Outer tank material: Aluminum Galvanized sheet with metal painting 4) Supporting frame: Aluminum with anti-oxidation treatment 5) ...