1)Sandwich board 2)FRP panel 3)polyurethane insulated 4)stainess steel parts We can ... galvanized steel sheet as inside cover,with EPS foam and/or plywood in core. Common panel thickness ... outside cover, plywood as inside cover, with EPS foam in core.Common panel thickness 30mm,40mm,Our ... in core.Model F: fiberglass sandwich panel ,with polyurethane foam in core as isolated layer.Common panel thickness: ...