a) Show no evidence of progressive smouldering or flaming in the interior and/or surface after 120 s after removal of the ignition source;b) Exhibit no burn damage area greater than 600 mm2 of any layer when tested in a horizontal orientation;c) Exhibit no burn damage area of any layer greater than 4500 mm2 when tested in a vertical orientation.8.2 Burn damage shall include discolouration but shall exclude discolouration caused by deposition of smoke particles.