TGIC Polyester vs. Aliphatic Urethane

Ask an Expert From: Products Finishing, , from Powder Coating Consultants, Div. of Ninan, Inc.

Posted on: 12/1/2005

Question: I work for a company that has had crane products powder coated for years with an aliphatic-urethane and are currently looking to switch to a TGIC polyester.

Question:

I work for a company that has had crane products powder coated for years with an aliphatic-urethane and are currently looking to switch to a TGIC polyester. The question that I have is which of these two powders will have a better resistance to UV and is there published information that would show those properties? I currently have all the comparisons for performance properties and the corrosion and chemical performance properties to compare the two but I have no information stating their performance properties regarding UV resistance. J. A.

Answer:

Both of these materials are similar with respect to UV resistance, except that TGIC has a slight advantage in most formulations. Of course, UV resistance is very dependent upon color. Light colors have better reflectance and therefore better UV resistance than dark colors.

Your powder coating supplier can provide you with QUV accelerated UV resistance values for their powders. If they don’t you can always run your own QUV testing.

 


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