Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

The authoritative public forum
for Metal Finishing since 1989
-----

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?

Thanks,

Kris Pierce
1998

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.
1997

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: