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White powdercoating has turned yellowish

We are doing long time White color powder coating, recently all the coating become yellowish and the delta-e value is higher than spec. Powder supplier tested his side and found ok. We cannot find out the problem origin? Is it in Owen, or Spraygun issue?

Roice Mathew
Engineer - Singapore
November 23, 2010

Sounds to me like the coating is getting overbaked. Has your cure oven temp been raised lately? Has there been a change in the time that the parts are in the oven?

Adam Krey
- Whitewater, Wiscosnin, USA
November 24, 2010

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Currently, I am doing testing/studies on the Powder coatings (white color) and try to set the parameter for Delta E (<1), Glosiness ( 50,±5), thickness ( 60-80 µm ).

can share something about the Glossiness, Delta E and interrelation to the time we put the parts into Oven for baking?
any other factors effecting the Glossiness and Delta E of painted parts?

appreciate your advice. thanks

Chew Ing Ming
- Johor, Malaysia
May 26, 2011