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Powder Coating Facts & Tips

Fletcher Aluminium in Auckland provides powder coating finishes in a wide range of colours.

Before deciding on a powder coated finish for your extruded aluminium product, you need to know about factors that affect final appearance and long term durability. This section explains some of these factors, along with the production standards we adhere to.

For expert advice and recommendations on achieving the best finish for your unique requirements, talk to Custom Solutions.

Starting with a smooth metal surface is important

Paint film is not transparent, so you will not see the parent metal through the finish. But depressions such as die lines or abrasion marks, unless very shallow, are not filled in by powder coating. Protrusions such as adherent particles or water corrosion will be 'painted over', leaving raised-type defects. These are aesthetic rather than damaging.

Differences in surface contour such as flow lines may also affect the paint film's reflectivity and make these effects more visible.

Cleaning products and environmental factors may cause corrosion

The bond between paint film and parent metal is very strong. It is enough to prevent corrosion under normal exposure conditions.

However, acid or alkaline cleaners must be avoided, along with:

• Contact with wet building materials such as plaster or cement and unprotected concrete (alkaline)
• Paint splashes – as attempts to remove them using paint stripper will destroy the film
• Solvents – as these will tend to soften and perhaps dissolve the film

Care needed to avoid scratching

The paint film on powder coated aluminium has about one tenth of the hardness of the parent metal, so it is much less scratch resistant than anodised aluminium.

Avoid using any type of scouring pad – whether metallic or synthetic.

Reasonable flexibility

Paint film is flexible enough to allow simple operations like drilling or punching.

Severe bending of powder coated aluminium extrusions is not easy because of the difference in the formability of the paint film and the base metal.

ISO and Telarc accreditation

Our powder coating plant operates in accordance with Fletcher Aluminium’s ISO 9001-accredited quality management system. Fletcher Aluminium also has ISO 14001 environmental management system accreditation.

The plant's quality management systems are registered with Telarc – New Zealand’s largest certifier of quality, environmental, and health and safety management systems.

Window Association of New Zealand (WANZ) Standards

Fletcher Aluminium’s powder coating finish complies with the Window Association of New Zealand (WANZ) Endurocolour Powder Coating Quality Standard, along with most other international specifications.

The Powder Coat Quality Standard requires a minimum film thickness of 50 microns on significant metal surfaces. In practice, coating thickness usually varies between 60 and 120 microns. This range is necessary to ensure adequate coverage of significant faces.

The Standard also requires other film qualities such as quality of paint cure and adhesion, along with quality of the pre-treatment conversion coating.