For That Extra Protection

MagnaFlow™ takes our standard zinc/aluminium alloy-coated steel substrate to the next level with the addition of magnesium. This enables the zinc to ‘flow’, which seals the cut edges, preventing exposure to premature corrosion. This makes it ideal for harsher environments and those nearer the coast.



Wye River Home

Wye House

MagnaFlow is a highly durable product with improved cut edge performance designed to give excellent colour retention and high formability at moderate cost.



MagnaFlow performance testing

  • Scratch Resistance

    Good scratch resistance. Testing includes needle scratch test – no marking of paint surface when a needle with a 2kg weight attached is drawn across. ASTM D5178-13.

  • Impact Resistance

    AS/NZS2728:2013 Table 2.2 and Appendix E. No loss of paint adhesion after a test piece is struck on the reverse side with a specified force, in line with the test methodology described in Appendix E.

  • Bend Test

    AS/NZS2728:2013 section 2.6.1 and Appendix F – No loss of adhesion or paint cracking when bent around a diameter equal to five times the thickness of the sheet.

  • Fire Resistance

    Suitable for continuous service up to 100ºC. Continuous service at higher temperatures may cause some colour change and damage to the paint film.

  • Salt Spray

    Meets the requirements of AS/NZS2728:2013 Sections 2.8 and 2.10.

  • Humidity Resistance

    Meets the requirements of AS/NZS2728:2013 Sections 2.8 and 2.9.

  • QUV Resistance (Durability of coating system)

    Meets the requirements of AS/NZS2728:2013 Section 2.8 and Table 2.4. Note: Tests are conducted on a flat panel.



Explore our most popular colours, suitable for the exterior of any project.

  • Offwhite
  • Monolith
  • Gull Grey
  • Birch
  • Wallaroo
  • Armour Grey
  • Slate Grey
  • Offwhite
  • Monolith
  • Gull Grey
  • Birch
  • Wallaroo
  • Armour Grey
  • Slate Grey


Our Promise

A steel roof is most susceptible to the elements along cut edges – but not MagnaFlow. The addition of magnesium to the standard zinc/aluminium alloy makes all the difference. As time goes on it allows the protective metal coating to microscopically flow over the cut edge. At this point a sacrificial anti-corrosive reaction takes place and a robust seal is created.

Technical Information+

Technical Information

For those who like the finer details

TECHNICALConforms to AS/NZS2728:2013. Suitable for ISO9223:2012. Atmospheric Classifications C1 – C4.

SUBSTRATE Hot-dipped zinc/aluminium/magnesium alloy coated steel coil, 210gms/m2 coating weight.

PRE-TREATMENT – Corrosion resistant chromate conversion coating.

PRIMER – Flexible corrosion resistant chromated primer. Nominal film thickness 7μ ± 1μ on the top side and 5μ ± 1μ on the reverse.

FINISH COAT – Flexible exterior acrylic, polyester or modified polyester coating. Nominal film thickness 18μ ± 2μ.

BACKING COAT – Shadow Grey (standard colour) wash coat, 5μ ± 1μ nominal thickness.

GLOSS – Typical gloss levels are 25 ± 5% measured in accordance with AS/NZS 1580.602.2 (60 degrees). A range of our colours can also be supplied in a low gloss version if required.

STRIPPABLE FILMProducts can be supplied with an optional strippable protective film.

View Technical Info

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