Insulation material ( PU/PIR/ rock wool/EPS/Glasswool) is sandwiched between two layers/skins of metal here. The layer/ skin material provided is PPGI/ Pre-coated GI(Steel), Prepainted Aluminum, Prepainted Aluzinc/Galvalume is the metal. Mill Finish GI/Steel, Mill Finish Aluminum too offered subject to qty.
The insulation material is put in different thicknesses and different densities depending of application of these panels.