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topic 0861

Humidity failures on waterborne coatings for plastics


Q. We are currently having problems with condensing humidity failures with waterborne paints over ABS and polycarbonate. It appears that the IR oven is annealing the top surface of the film, entrapping the water in the film. The failure mode is streaking or whitening. Has anyone seen failures like this? Any insight on fixes? Longer bake? Slower or faster solvent blend? Resin problems?


Kris Pierce


A. Is this occurring straight from oven?

If not then it is likely to be a general humidity failure of the resin which would cause " chalking" of the surface, i.e., Streaking?

Sounds like a resin problem to me.

Paul Lindley
- U.K.

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