Thank you all so much for your replies.
To clarify:
PTFE in catalyst powder is needed for process.
PTFE not coated on pipe as that would aggravate existing problem causing more sticking issues.
I mentioned coating with PTFE not being an option as it came up in some literature as a possible...
What would be an effective way to (automate a) clean down of a pipe operating under a vacuum for even deposition on substance below. We currently take equipment apart and blow compressed air into the pipe every so often to remove powder stuck to the sides as when they build up, it negatively...
