ColorCote ® MagnaFlow


ColorCote ® MagnaFlow™

Conforms to AS/NZS 2728:2013 Product type 6 (Table 1.1). Suitable for ISO 9223 Atmosphere Classification C1-C5 as per AS/NZS 2728:2013.


A high durability product with improved cut edge performance designed to give excellent colour retention and high formability at moderate cost.


Hot dipped Aluminium / Zinc / Magnesium alloy coated steel coil with a minimum coating weight of 240 gms/m2 coating weight (240 gms per m2).
Manufactured to AS 1397 : 2011. Steel grade either G550 or G300.


Corrosion resistant chromate conversion coating.


Flexible corrosion resistant high build primer both sides. Nominal film thickness 5 microns on the topside and on the reverse. ±1 Micron.

Finish Coat

Flexible exterior acrylic, polyester or modified polyester coating system. Nominal film thickness 18μm ± 1μm.
Note: the finish coat can be applied to one or both sides of the sheet in the same or different colours. Colours outside the standard range may be available depending on colour and quantities.

Backing Coat
Shadow Grey (standard colour) wash coat 5 microns thickness ±1μm.


Typical gloss levels are 25%, measured in accordance with ASTM D523-89 (600). Non standard gloss levels may be available on application.

Strippable Film

Products can be supplied with an optional strippable protective film at extra cost. This material has a relatively short life span under exterior exposure conditions. It should be removed either as soon as possible within 48 hours of outdoor exposure.

Expected Performance

Outdoor Durability: ColorCote® MagnaFlow™, under normal well washed conditions of exposure, is expected to show no cracking (other than that which may occur during forming), flaking or peeling of paint film for 15 years from date of installation.

Colour change during service will depend on the colour chosen, aspect, design of the structure and the environment. Maximum colour change levels of ColorCote® MagnaFlow™ colours in moderate (C2) environments after 10 years of service are given in warranty documentation. Colour change is measured using an instrumental colour spectrophotometer, according to ASTM D-2244-93, and determined on clean surfaces, free of all dirt, chalk, oxidised film, oil, grease and other foreign contaminants.

Some chalking may occur. A maximum rating of 2 is expected after 20 years exposure, when measured in accordance with AS/NZS 1580.481.1.11:1998. Scale is between 0 and 5 with a lower number indicating less chalking.

Handling and Storage

To avoid damaging the paint surface the material must be handled carefully during transport and rollforming. Pacific Coilcoaters does not recommend the use of rollforming lubricants on ColorCote® products, as they will affect performance of prepainted steel and will lead to staining and uneven premature fading.

Typical Properties

  • Mar Resistance: Good
  • Scratch Resistance: Good
  • Impact Resistance: (AS/NZS 2728 Appendix E) – Greater than 10 Joules
  • Pencil Hardness: (AS/NZS 1580.405.1) – F minimum
  • Bend Test: (AS/NZS 2728 Appendix F) – No loss of paint adhesion when bent around a diameter equal to five times the thickness of the sheet.
  • Heat Resistance: Suitable for continuous service up to 1000C. Continuous service at higher temperatures may cause some colour change of the paint film.
Ignitability Index
Spread of Flame Index
Heat Evolved Index
Smoke Developed Index

Accelerated Corrosion Tests
(Tests are conducted on a flat panel).

Salt Spray

Meets the requirements of AS/NZS 2728:2007 Sections 2.8 and 2.10

Humidity Resistance

Meets the requirements of AS/NZS 2728:2007 Sections 2.8 and table 2.9

QUV Resistance

Meets the requirements of AS/NZS 2728:2007 Sections 2.8 and table 2.4

Chemical Resistance

ZinaCore has good resistance to accidental spillage of solvents such as methylated spirits, mineral turpentine, toluene, tricholoroethylene and dilute acids and alkalis. All spillages should be removed immediately by wiping or washing.

Recommended End Uses

Exterior uses where there is a high risk of accelerated corrosion. It has very good colour and gloss retention and is suitable for roofing, cladding, rainwater goods. For information concerning product use in areas not covered by ColorCote® MagnaFlow™ refer to the ColorCote® ZinaCore X™ and / or AlumiGard X™ technical brochures or contact Pacific Coilcoaters for details.

MagnaFlow is not suitable for use as water tanks or areas where a constantly wet environment is maintained or in constantly running water or in contact with soil.

Site Practice
If nestable profiles become wet while closely stacked, formation of wet storage stain or ‘white rust’ is inevitable.

To minimise the possibility of inadvertent contamination:

  1. Inspect deliveries on arrival. If moisture is present, individual sheets should be dried immediately with a clean rag and then stacked to allow air to circulate and complete the drying process.
  2. Well ventilated storage is essential. Always store metal products under cover in clean, well-ventilated buildings.
  3. Cross-stack or fillet sheets where outside storage is unavoidable and make provision for a fall to allow water to run off.

It is the responsibility of the roofing contractor to avoid damaging the roof sheeting during its installation and fixing. Never drag sheets from a pile. Remove by ‘turning’ off the stack. Lift sheets onto a roof, and do not drag over the eaves or purlins. Use clean footwear, remove swarf and other contaminants regularly. For further information refer to the MRM Code of Practice.

Touch Up Paint

ColorCote® is a baked on paint system which has different weathering characteristics to standard air drying paints. Do not use touch up paint on ColorCote® products. Minor scratches should be left alone.

Clean Up

Installation procedures involving self-drilling screws, drills and hacksaws etc., will leave deposits of swarf and metal particles.
These particles including blind rivet shanks, nails and screws should be swept and washed from the roof at the end of each day.

Dissimilar Materials

When dissimilar metals come into contact with each other, the electric potential difference between the metals establishes a corrosion cell and accelerated corrosion can occur. To avoid this problem the following precautions should be observed:

  • Avoid discharges of water from brass or copper pipes onto ColorCote® MagnaFlow™.
  • Do not use non-galvanised steel, copper, stainless steel or Monel metal in direct contact with ColorCote® MagnaFlow™.
  • Do not use lead flashings in contact with ColorCote® MagnaFlow™ products. Soft edge aluminium, or notching of flashings, are the best solutions.
  • Do not use tanalised timber in direct contact with ColorCote® MagnaFlow™ products. Use PVC tape or similar barrier to isolate potential problem points of contact between materials. ColorCote® MagnaFlow™ products are not suitable for use in the following situations:
  • Animal shelters, where excessive ammonia fumes can accumulate due to inadequate venting, or where direct contact with animal effluent can occur.
  • Water tanks or areas where a constantly wet environment is maintained.
  • In direct contact with concrete, or where lime deposits are evident.
  • In contact with soil. (Allow 75mm run off below cladding sheets to ground level.)


Match corrosion resistance of the fastenings with the service life of the chosen ColorCote® MagnaFlow™ product. Class 4 coated screws will give best service life with ColorCote® MagnaFlow™.

Do not use stainless or Monel fasteners on ColorCote® MagnaFlow™ products. Aluminium rivets should be used for best results.
For further details refer to the MRM Code of Practice.

Sealing and Jointing

Where sealed joints are required, use only neutral cure silicon rubber sealant, together with mechanical fasteners, such as aluminium rivets. Do not solder or weld ColorCote® products.

Unwashed Areas

These are typically those areas that are not washed by natural rainfall, such as the underside of eaves, sheltered roofs or wall cladding etc. These areas are excluded from warranty. Pacific Coilcoaters recommends the exclusion of unwashed areas by design wherever possible. In cases where this is not possible, then a regular washing programme should be put in place.

Contaminants should be removed by water blasting or mechanical washing with water and a soft nylon brush for best results at least every 6 months, or more frequently if contaminant build-up keeps occurring.

Roof Pitch

Do not use a pitch of less than 3°to avoid ponding and premature degradation of the coating system.


ColorCote® MagnaFlow™ Brochure

Get all the facts. Available for download below is the ColorCote® MagnaFlow™ brochure to help you and your team of professionals through the details of your material selection. We want you to be happy and confident that you've made the right choice for all the right reasons.

For more information on the range of ColorCote®materials see the ColorCote® website.

Download ColorCote® MagnaFlow™ BrochureLast updated May 2021