Fire Engineering Assessment, Revision 01 
DeltaCool, DeltaSecrectFix, DeltaTrim at 100 mm and 75 mm Fire Performance, Project No. 25367 
25367-SFE-FEA-01-Delta Panel Fire Performance 
 
 
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4.1.5 Assessment 
The purpose of testing to AS ISO 9705-2003 and classification to AS 5637.1:2015 is to indicate the amount of 
time taken for the material, in this case 100 mm DeltaCool™ panel with a mineral wool core, to reach flashover. 
Under AS ISO 9705-2003 testing conditions, this is taken as the point at which the heat release rate reaches 
1MW. AS 5637.1-2015 gives the tested material a group classification of: 
- 
Group Number 1 – material that does not reach flashover when exposed to 100 kW for 600 s followed 
by exposure to 300 kW for 600 s. 
- 
Group Number 2 – material that reaches flashover following exposure to 300 kW within 600 s after 
not reaching flashover when exposed to 100 kW for 600 s. 
- 
Group Number 3 – material that reaches flashover in more than 120 s but within 600 s when exposed 
to 100 kW. 
- 
Group Number 4 – material that reaches flashover within 120 s when exposed to 100 kW. 
NCC S7C4 utilises the group classification from AS 5637.1-2015 to restrict the use of materials for walls and 
ceilings for various layouts, building classifications, and services. 
A DeltaCool™ panel with a mineral wool core is made from laminates of pre-painted steel skins bonded to the 
mineral wool core. As measured by Jensen Hughes, the two steel skins have a nominal thickness of 0.65 mm 
each which are expected to be adhered with an adhesive layer of less than 1 mm in thickness. For the 100 mm 
thick DeltaCool™ panel test specimen, the mineral wool core has a nominal thickness of 99 mm (illustrated in 
Figure 4-13). 
 
Figure 4-12 – Indicative cross section of the tested DeltaCool™ Panel. 
The mineral wool was tested in accordance with AS 1530.1-1994 by CSIRO Infrastructure Technologies dated 
24 July 2020 and was deemed to be non-combustible (Certificate of Test in Appendix E – Certification of Test 
for Mineral Wool). The steel is also non-combustible in accordance with NCC C2D10(5)(b). Thus, the concern 
with the materials contribution to the HRR are the painted coating on the steel skin and the adhesive binding 
the steel skin and the mineral wool. As seen in Figure 4-13, the burner was initiated at 100 KW at 0 s and 
increased to 300 kW at 600 s for the remainder of the test period. The total HRR of the burner with the 100 
mm thick DeltaCool™ panel is not appreciably increased to the HRR of the burner itself. 
Mineral Wool – 99 mm 
Adhesive < 1 mm 
Adhesive < 1 mm 
Painted Steel Skin – 0.65 mm 
Painted Steel Skin – 0.65 mm 

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