What is Powdercoat? Colour, care, maintenance...

What is powder coating?

Powder coating is the most common type of metal finishing used today and was first used in Australia about 1967.
 
Powdercoating involves electrostatically spraying dry paint to a product. The product is then oven baked and the finished result is the same as  2-pack wet paint.
 
 
  
  Perforated Powdercoated Seat

 
 
Points to remember regarding your Powdercoated DOSmith product:
 
  • Products powdercoated for internal use MUST NOT be used outdoors.
  • Use the Dulux Colour Selector to choose your colour and to avoid confusion note the Colour name and number on your order.
  • Products that are not stored indoors should be removed from their packaging asap after delivery to avoid the product 'sweating'. Products can be subjected to extreme humidity if stored in plastic wrapping and exposed to the elements, this may cause the product to 'sweat' and cause the powdercoating to fail. 
 
 

Preparation

The basis of any good coating is preparation, DOSmith only uses reputable powdercoating services that employ suitable preparation and pre-treatment.

The preparation treatment is different for different materials. 
In general, for all applications the preparation treatment for aluminium is as follows:  
     Clean  
     Rinse      
     Etch     
     Rinse   
     Chromate or Phosphate    
     
 Demin Rinse

For steel the preparation for interior applications may be:  
     Clean  
     Rinse  
     Derust  
     Rinse  
     Iron Phosphate  
     Rinse  
     Acidulated Rinse 
      For exterior applications:   
     Clean  
     Rinse  
     Etch  
     Rinse  
     Grain Refine  
     Zinc Phosphate  
     Rinse  
     Acidulated Rinse 

 
For hot dipped galvanized coatings 
     Clean  
     Rinse  
     Etch  
     Rinse  
     Grain Refiner  
     Rinse  
     Zinc Phosphate  
     Acidulated Rinse  
     
 
How is it done - electrostatic spray? 
 
The powder is applied with an electrostatic spray gun. There are four main stages to full cure: 

               MELT, FLOW, GEL, CURE 
 
The resultant coating can vary from matt to high gloss depending on the powder selected.

 
Why powder coat?

Oven baked powdercoat is a high specification UV, scratch resistant coating. There is a huge selection of colours and finishes available including custom mixed colours and finishes.
 
Powdercoating is also suitable for a large range material sizes and can be applied over various surface finishes.
 
The Australian Standard, "AS/NZS 4506 - Thermoset powder coatings" recommends a 25 micron minimum for interior and upto 60 microns for exterior uses although these figures are dependent on the type of powder being applied. The powder manufacturer will be able to provide advise in most instances regarding suitable powder thicknesses.
 
 
  
  Powdercoated Bollard
 
  
Installations and maintenance
 
Powdercoat should be protected during transport. All DOSmith products are shipped in protective wrapping and boxed if possible (depending on product size). 
 
Powdercoat is relatively easy to clean as its non porus surface generally does not hold dirt. Powdercoated products should be cleaned regularly to maintain an as new appearance. Generally soap and water are adequate for routine cleaning.

During installations, the powder coating should be protected from damage due to abrasion and materials of construction such as mortar and brick cleaning chemicals.

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