... /T 17748-1999 standard 2) Material A) Front: Aluminum alloy sheet coated with fluoro-carbon resin (PVDF) or Polyester resin (PET ... painting B) Core: No-toxic polyethylene C) Back: Aluminum alloy sheet coated with polyester resin painting D) Surface finish: Treated with ... roasting coating D) Surface coating thickness: 30um E) Aluminum alloy sheet thickness: 0.2mm, 0.3mm, 0.4mm, 0.45mm, 0 ...