Summary for ptfe thin film coating Discussion
PTFE thin film coating is being considered for a 316L stainless steel fixture exposed to a heated sulfuric acid vapor mixture containing CuOx powder, with some parts electro-polished. Frank DeFilippi asks what PTFE thickness in microns would be recommended and whether the coating is overkill for electro-polished 316L. The excerpt provided does not include any replies, so there is no documented answer in the thread text about a specific thickness or whether PTFE is necessary. Based on the question alone, the practical issue is balancing chemical resistance against the fact that 316L plus electropolishing may already offer some protection. Because no responder comments are shown, no firm recommendation can be attributed from the source excerpt.
Q. Greetings:
I have a small fixture design that will be exposed to a vapor mixture of CuOx powder dissolved in heated sulfuric acid 10-20% concentration. Parts of the fixture will be electro-polished, but was considering applying a thin coat of PTFE (clear) added protect. My question(s):
1. Recommended PTFE thickness in microns
2. Is PTFE coating overkill considering the parts are 316L and being electro-polished?
Frank
Frank DeFilippi
– Billerica Massachusetts
January 27, 2021