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Powder Coating

We offer a range of polyester and epoxy polyester powder coating systems, available from the Cromadex/Interpon ranges, which provide excellent chemical protection and UV & weather resistance, as well as the hardwearing durable characteristics associated with powdercoat.

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We have a large oven, with a conveyor track installed which allows us to do large & small batch work, up to around 100kg in weight per item, and up up to 2.5m in length. We also have a 3.5m x 4.5m box oven, which allows us to do bigger, heavier, single items like car chassis, large railings or gates, weighing up to 500kg. 

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We generally work from the ‘RAL Classic’ colour range, in a range of gloss level finishes. We have over 250 finishes available, including a number of ‘special’ finishes available, . See our special finishes page for some examples of these 

If you are really set on a specific colour or finish, we can order these in at cost, and we can also have colours made to order if required

What is powder coating and the process?

Powder coating is a form of coating/painting that has a huge range of applications.

As the name suggests, it is applied in a dry powder form. This is done using specialist equipment, which electrostatically charges the powder, so that it adheres to the substrate.

Once fully coated, the powder coat is the cured in an oven, typically at 180°C - 200°C, usually for 10 to 15 minutes.

During this time, the powder melts into a liquid, and flows out evenly, over the surface, to form the polyester coating.

Once it is cooled down, the curing process is complete forming a strong, long lasting bond.

Before being powder coated, every item needs go through some form of preparation.

The most basic level, would be to simply degrease the surface with a mild solvent to remove the majority of grease & oils.  

The best, and most thorough preparation, would be to blast clean the surface, which does a much more thorough job of cleaning off all contaminants, and provides the best ‘key’ for the powder coating process.

This is also an essential stage for any primers that are going to be used, as without blasting they will not provide the full benefits of their properties. 

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What are the benefits?

  •  Powder coating produces a long-lasting and durable, hard finish that is both protective and decorative.

  • Ideal for both Industrial and domestic uses

  • Resistant to chipping and scratches

  • Can apply relatively thick, strong coatings for heavy use items

  • Powder coating can be formulated in virtually any colour

  •  Various protective and decorative physical and mechanical characteristics.

  • Environmentally friendly in comparison to solvent based paint equivalents

  • Cost effective 

  • Wide range of applications 

  • Once the item has cooled down, the curing process is complete, so much faster than traditional 2pk paints

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What can you apply powdercoat to?

Just about any metal surface, and there are now emerging techniques and products that can allow users to apply powdercoat to wood & plastics, although these are very specialised.

The type of metal dictates what processes and materials are used, namely the primer that is applied 

The general purpose of a primer, is to provide a sound base and build for a high quality and even finish. When it comes to powdercoating, it is important that there is a strong bond between the metal and the powdercoat in order to provide a long lasting, durable finish, and this is achieved through the preparation of the substrate, and use of a suitable primer 

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Steel/Iron requires an anti corrosive primer , which is often zinc based. The primer is applied, before being ‘green cured', which simply means it is partially cured at 120degrees c. The topcoat is then applied on top, and sent through for final cure at approx 180-200. This process means that the the two paint layers fuse together; the primer layer to the metal substrate, creating a very strong and durable bond between the metal and the paint, which is one of the main characteristics and benefits to powder coating.

 

Anti gas primer - galvanized steel, cast aluminium and some other metal substrates can emit gases when at the high temperatures required for powder coating. These gasses push through the surface, and show as 'bubbles' & imperfections on the finished piece. To counter this, we use an 'antigas primer' which is developed to form a barrier to stop these gasses coming through, whilst still providing all the necessary characteristics of a base coat primer.

 

Etch Primer - There are some materials, such as sheet aluminium, or stainless steel, that cannot always be blast cleaned, as the high pressures can distort the metal. As these metals have a  smooth finish, any paint that is applied directly onto it, is unlikely to bond well.  In this case, we would use an etch primer, which are formulated with a combination of resins to maximise adhesion between the metal surfaces and powder coat

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Chiltern Blast Cleaning

sales@blast-clean.co.uk

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01442 832 262

07753 225058

07860 279699

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