🇦🇺 Australia · AS ISO 9239.1 · Critical Radiant Flux · NCC Spec 7
AS ISO 9239.1 — Fire & Critical Radiant Flux for Flooring in Australia
Fire performance is the compliance layer Australian importers most often misread — usually by quoting a European fire class and assuming it transfers. It does not. Australia rates floor fire performance by critical radiant flux under AS ISO 9239.1, and the minimum depends on whether the building has sprinklers. This guide explains the test, the NCC thresholds, and how to specify SPC and LVT without tripping over the wrong standard.
Short answer
Australia measures floor fire performance as critical radiant flux (CRF, kW/m²) under AS ISO 9239.1 — higher is better. NCC 2022 Specification 7 sets the minimum, and it is tiered: a sprinkler-protected building commonly accepts a lower CRF (around 1.2 kW/m² for many floor coverings), while non-sprinklered and fire-isolated areas need more, plus a smoke limit. A European Bfl-s1 class is a different system and is not the Australian compliance value.
Reviewed June 2026 · ABCB NCC 2022 Specification 7 · AS ISO 9239.1 · General guidance, not fire-engineering or certification advice.
The most common fire-compliance mistake
A European fire class is not an Australian one
Many vinyl flooring datasheets prepared for export carry a European reaction-to-fire class — typically Bfl-s1, from EN 13501-1. It is a legitimate classification, but it is the wrong one for an Australian project: Australia does not use the European Euroclass system for floors. It uses critical radiant flux measured under AS ISO 9239.1, and an Australian building certifier will ask for a CRF figure, not a Bfl-s1 class. Quoting the European class and assuming it satisfies the NCC is one of the most common reasons a specification stalls at approval.
The two are not convertible — there is no fixed lookup from Bfl-s1 to a CRF value, because they are measured by different test methods. For an Australian project, the flooring needs AS ISO 9239.1 data. The good news is that the test and the thresholds are clear once you separate them from the European framework.
What AS ISO 9239.1 measures
The floor radiant panel test
AS ISO 9239.1 is the floor radiant panel test. A horizontal flooring sample is exposed to a gas-fired radiant panel that creates a gradient of heat across its surface; a flame is applied at the hot end, and the test measures how far the flame spreads before it self-extinguishes. From this the test produces two numbers the NCC cares about:
Critical Radiant Flux
CRF (kW/m²)
The heat flux at the point where the flame extinguishes — the critical heat flux at extinguishment (CHF). The further the flame fails to spread, the higher the CRF. Higher is better; the NCC sets a minimum.
Smoke development rate
≤ 750 %·min
The rate of smoke production during the same test. For buildings without a compliant sprinkler system, the NCC limits this to 750 percent-minutes — an additional requirement on top of the CRF minimum.
Because both numbers come from the same test, a single AS ISO 9239.1 report covers both the CRF and the smoke result a certifier needs.
The NCC requirement
Specification 7 — and why sprinklers change the number
In NCC 2022 the fire-hazard-properties provisions for floors sit in Specification 7 (the clause numbered C1.10 / C1.10a in NCC 2019). It requires a floor lining or covering to have a CRF not less than the value in Table S7C3 — and that value is tiered by building class, location, and crucially whether the building has a compliant sprinkler system:
| Scenario | Indicative CRF minimum | Why |
|---|
| Sprinkler-protected building (e.g. Class 2 apartment SOU) | Often ~1.2 kW/m² | Sprinklers control a fire, so a lower CRF is accepted for many floor coverings. |
| Non-sprinklered / general areas | Higher — see Table S7C3 | No sprinkler suppression, so the floor must resist flame spread more. A smoke limit (≤ 750 %·min) also applies. |
| Fire-isolated exits (stairs, passages) | Highest tier | Escape routes carry the strictest requirement, sprinklered or not. |
| Floor continued > 150 mm up a wall | Plus a Group number | That portion is also assessed as a wall lining (AS ISO 9705 / AS/NZS 3837). |
Values are indicative of how the tiering works, not a substitute for Table S7C3 — read the current table for the exact figure for your building class, location and sprinkler status. As an industry rule of thumb, a covering with CRF above about 4.5 kW/m² and smoke below 750 %·min satisfies Class 2–9 in most situations with or without sprinklers; but the governing value is always the one in the table for your scenario. Class 9c (aged care) without a sprinkler has no CRF requirement in the table.
The practical takeaway: you cannot specify flooring fire compliance without knowing the building’s sprinkler status and class. The same vinyl floor may be compliant in a sprinklered apartment but need a higher-CRF product (or a sprinkler concession) in a non-sprinklered building. Establish the sprinkler status first, then match the CRF requirement.
Specifying SPC & LVT
How to specify vinyl flooring for AS ISO 9239.1
As with slip resistance, the fire performance of a vinyl floor is a property of the specific product and its construction, confirmed by a test report — not a blanket claim about “SPC”. The achievable CRF depends on the product, so a credible fire specification ties the requirement to the building scenario and the evidence.
The right way to specify
Confirm the building’s sprinkler status and class first, read the CRF minimum from Specification 7 Table S7C3, then request AS ISO 9239.1 data for the proposed product. A defensible specification reads, for example: “rigid-core SPC, CRF to meet NCC Specification 7 Table S7C3 for the building class and sprinkler status, with AS ISO 9239.1 test report and smoke development rate ≤ 750 %·min where the building is non-sprinklered.”
Our honest position: Ecoflors does not print a single CRF figure on a product and present it as a guaranteed Australian compliance value, and we do not offer a European Bfl-s1 class as if it were the Australian requirement — they are different test systems. What we do: provide third-party AS ISO 9239.1 test data for the specified product where available, and arrange testing at a NATA-accredited laboratory (such as AWTA) when a project needs a verified CRF and smoke result for the exact product. Tell us the building class and sprinkler status, and we will match a product and provide the evidence your certifier requires.
AS ISO 9239.1 fire FAQ
Critical radiant flux and flooring — questions specifiers ask
What is critical radiant flux (CRF) for flooring?
Critical radiant flux is the critical heat flux at extinguishment (CHF, in kW/m²) measured under AS ISO 9239.1, the floor radiant panel test. A flooring sample is exposed to a radiant heat gradient and ignited; the CRF is the heat flux at the point where the flame stops spreading and extinguishes. A higher CRF means the floor resists flame spread better, so the NCC sets a minimum value — higher is better.
What CRF does flooring need under the NCC in Australia?
It is tiered, not a single number. NCC 2022 Specification 7 (Table S7C3) sets the minimum CRF by building class, location and whether the building has a compliant sprinkler system. A sprinkler-protected building commonly accepts a lower CRF — around 1.2 kW/m² for many floor coverings, such as a Class 2 apartment — while non-sprinklered buildings and fire-isolated exits require higher values, plus a smoke development rate of no more than 750 percent-minutes. Always read the value for your specific scenario from the current table.
Does a European Bfl-s1 class satisfy the NCC?
No. Bfl-s1 is a reaction-to-fire class under the European EN 13501-1 system, which Australia does not use for floors. Australian compliance is based on critical radiant flux measured under AS ISO 9239.1, and there is no fixed conversion between the two because they are different test methods. An Australian certifier will ask for AS ISO 9239.1 CRF data, not a Euroclass. Quoting Bfl-s1 and assuming it meets the NCC is a common cause of specification delays.
Why does a sprinkler system change the CRF requirement?
Because sprinklers control a fire if one starts, the NCC accepts a lower critical radiant flux for floor coverings in a building protected by a compliant sprinkler system — the suppression reduces the reliance on the floor resisting flame spread. In a non-sprinklered building the floor carries more of the fire-safety burden, so a higher CRF is required and a smoke development limit applies. This is why establishing the building’s sprinkler status is the first step in specifying fire-compliant flooring.
What is the smoke development rate requirement?
For buildings not protected by a compliant sprinkler system, the NCC requires the floor covering’s smoke development rate to be no more than 750 percent-minutes, measured in the same AS ISO 9239.1 test that produces the CRF. In sprinklered buildings this smoke limit generally does not apply in the same way. Because both figures come from one test, a single AS ISO 9239.1 report provides the CRF and the smoke result a certifier needs.
What fire test data can Ecoflors provide for an Australian project?
Ecoflors can provide third-party AS ISO 9239.1 critical radiant flux and smoke data for the specified product where available, and arrange testing at a NATA-accredited laboratory (such as AWTA) when a project needs a verified result for the exact product. We do not present a single CRF figure as a guaranteed compliance value, nor offer a European Bfl-s1 class as the Australian requirement, because they are different systems. Tell us the building class and sprinkler status and we will match a product and supply the evidence your certifier requires.
Factory-direct · Third-party AS ISO 9239.1 data · NATA testing arranged
Specify fire compliance with the right standard.
Tell us the building class and sprinkler status, and we will match a product to the CRF minimum in NCC Specification 7, provide third-party AS ISO 9239.1 data where available, and arrange NATA-accredited testing (such as AWTA) for a verified CRF and smoke result where a project needs it — alongside FloorScore SCS-FS-05154 and AS 4586 slip data for the full specification.
SPC & LVT · AS ISO 9239.1 CRF data on request · NATA / AWTA testing arranged · FloorScore SCS-FS-05154
FOB Ningbo / Shanghai · MOQ 800 sqm / SKU · factory-direct since 2017
Disclaimer: General information for specifiers, importers and distributors, not fire-engineering, building-certification or legal advice. NCC fire-hazard-properties requirements for floors (NCC 2022 Specification 7, Table S7C3; CRF determined under AS ISO 9239.1; smoke development rate ≤ 750 percent-minutes for non-sprinklered buildings; Group number under AS ISO 9705 / AS/NZS 3837 for floor continued more than 150 mm up a wall) are tiered by building class, location and sprinkler status and should be confirmed against the current NCC and a fire engineer. The European Bfl-s1 class (EN 13501-1) is a different system and is not the Australian compliance value. The achievable CRF of a product depends on its specific construction and must be confirmed by an AS ISO 9239.1 test report — Ecoflors provides third-party data where available and arranges NATA-accredited testing rather than representing a single CRF figure as a guaranteed compliance value. Reviewed June 2026.
