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#1 2017-04-22 15:49:34

roberthans
Участник

Common Parylene coating problems.

Hi all

We have a parylene coating system and as of late we have seen a steady downward trend in our coating thickness, we should be running at about 1.1um to 1.3um on our parts but we are seeing below 1.0um

we have had a number of small leaks in the system which have been fixed, we still get a leak rate of about 0.012 ub/s and a base vacuum of 0.020 ubs with nothing in the chamber.

Just wondering if anyone has had the same type of problems or if someone has a kind of cheat sheet with known issues.

one thing I do know is cleanliness is next to godliness when it comes to Parylene coating.

Also has anyone done any work into re-absorption rates of materials after they have been de-gassed.

Thanks.
I didn't find the right solution from the internet.
References:
- http://www.eng-tips.com/viewthread.cfm?qid=415027

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