DeltaFireXTM Car Port System Revision 1-4 16 When the AS1530.3 test is repeated with the steel facings bonded either side of a material deemed not combustible under AS1530.1, in this case mineral wool (tests 2 & 3 in Table 3-4), the results give a near identical outcome to tests 4 to 7 in Table 3-4, that is: • Ignitability Index: 0 (Range 0-20) • Spread of Flame Index: 0 (Range 0-10) • Heat Evolved Index: 0 (Range 0-10) • Smoke Developed Index: 2 (Range 0-10) Based on these results and with reference to the tested facings and substrates, the tested indices are independent of the substrate to which the coated metallic facings are bonded. The results are indicative only of the fire performance of the coated metallic facings during the early stages of fire development, before involvement of the substrate. As such, the test results are independent of the thickness of the core material used (substrate) to which the coated metallic facings are bonded. Furthermore, the AS1530.3 results in tests 2 and 3 (Table 3-4) indicate that the DeltaOrb™ system and the DeltaTrim™ system achieves identical early fire hazard performance. Based on these results, the differing profiles of the DeltaOrb™ and DeltaTrim™ systems do not appear to have any significant effect on the achieved fire performance of the panels. As such, the DeltaOrb™ and DeltaTrim™ panels may be used interchangeably and the outcomes of this assessment remain applicable to both panel types. The AS1530.1 test provides determination of combustibility for each material independently. The mineral wool has been tested to AS1530.1 (test 1 in Table 3-4) and is deemed not combustible. Low carbon steel is widely accepted as a non-combustible construction material. This is also confirmed by an AS1530.1 test for low carbon steel manufactured by Bluescope Australia (test 11 in Table 3-4) in which the test outcome demonstrates that the material (low carbon steel) is not deemed combustible. The NCC Volume 1 (although not applicable to NCC Housing Provisions Standard & Volume 2) further states “The following materials … are non combustible and may be used wherever a non-combustible material is required: (b) Steel, including metallic coated steel”, which illudes to steel being considered a non- combustible construction material under the NCC (as is concrete and masonry). On this basis, low carbon steel is assumed to be non-combustible, regardless of who the manufacturer is or whether the manufacturer has tested the material to AS1530.1.
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