... heater Material:Aluminum 6063/6061 aluminium shell of water heateraluminium shellwater heater 1,Material ... drilling, tapping,CNC milling,CNC lathe and so on.Surface treatment polishing,brushing,anodized, electroplate,powder coating, ... sandblasting,painting , so on. 2, Typical chemical composition (GB/T3190)Aluminium GradeSiFeCuMnMgCrZnTiimpurityAl60630. ...