There are some important Golden Rules to remember;
Steel Parts must be free of mill scale or rust, if not then shot blast first.
Some parts have differing thicknesses of metal making up components, ensure parts are cured well (I.E. have enough time in the oven) to match the thickest section otherwise the powder may flake or chip off the parts that are under-cured.
All parts have to be coated ‘fit for purpose’ Ask where the parts are being used, if they are for outside use then there should be some sort of pre-treatment prior to Powder Coating.
Exterior Parts whether Aluminium or Steel must be pre-treated. Aluminium parts can be Chromated, Etched or flash hard anodised. Steel parts can be phosphated or have a zinc rich primer applied as an undercoat.
To assist your decision we have created eight sample specifications that can be viewed and downloaded.
Spec 1
Hot Vapour Degrease and Polyester Powder Coat. A basic spec that is suitable for interior use components. This will pass up to 250 hours Salt Spray test. This is a popular Specification. Make sure that the substrate is free from corrosion, if not then shot blast first.
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Spec 2
Hot Vapour Degrease and Nylon Modified Polyester Powder Coat. The same as spec 1 but with a more durable hard wearing finish, passes 3H hardness test.
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Spec 3
Hot Vapour Degrease, Zinc Phosphate and Polyester Powder Coat. Suitable for Exterior use components. This will pass 500 hours plus Salt Spray Test.
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Spec 4
Hot Vapour Degrease, Immersion Zinc Phosphate and Nylon Modified Polyester Powder Coat. same as spec 3 but with a more durable hard wearing finish, passes 3H hardness test.
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Spec 5
Hot Vapour Degrease, apply an undercoat of Zinc Rich Primer and 2nd coat of Polyester Powder. Higher Quality Spec that will pass 1000 hours plus Salt Spray Test. As long as the substrate is corrosion and scale free this is probably the best general purpose coating specification.
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Spec 6
Vapour Degrease, Immersion Zinc Phosphate, 1st coat of Powder Coat Zinc Rich Primer and 2nd coat of Polyester Powder. This Spec will pass over 1000 hours Salt Spray Test.
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Spec 7
Vapour Degrease, 1st Coat of Powder Coat Zinc Rich Primer and 2nd coat Nylon Modified Polyester Powder, Higher Quality Spec that will pass 1000 hours Salt Spray Test and 3H hardness test.
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Spec 8
Vapour Degrease, Immersion Zinc Phosphate, 1st coat of Powder Coat Zinc Rich Primer and 2nd coat of Nylon Modified Polyester Powder. This Spec will pass over 1000 hours Salt Spray Test and 3H Hardness.
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