... Materials1) Front: aluminium alloy sheet coated with PVDF or PE2) Core: nontoxic polyethylene/plastic fireproof materials3) Back: aluminium coated with polyester ... renew the panel.4)The aluminium surface is tough, the core PE panel is flexible, therefore the panel has high impact ... resistance.5)The aluminium surface is tough, the core PE panel is flexible, therefore the panel has high impact ...