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I'm having trouble selecting a chem film class. I'm designing an avionics box that basically operates in a marine environment and is safety critical equipment. Type I is not an option for us (environmental restrictions), so I intended to callout Type II, Class 1A. There were concerns with...

I'm having trouble selecting a chem film class. I'm designing an avionics box that basically operates in a marine environment and is safety critical equipment. Type I is not an option for us (environmental restrictions), so I intended to callout Type II, Class 1A. There were concerns with...

Thanks everyone, I appreciate the input. I feel mostly vindicated. Our manufacturer's problem report included insufficient training.

Hi, our customer returned parts due to bad helicoil threads. There were several issues: some were tanged, locking and not free-running, over-installed (way too deep), damaged (feels like our contract manufacturer just had a bucket of random helicoils and tried to force install damaged threads)...