Hi Guys new to the forum at present having a few issues with my boss over the use of PTFE Tape on R134a refrigerants/oils .I have explained to him that this is not suitable for these applications as it leaks thru time due to a chemical breakdown,however my opinion is not being recognised as yet. Is there anyone out there who can give me some hard facts(preferably in the form of scientific proof or Defra/fgas origins).As at present i only have opinions from other fridge engineers and opinions dont count with him.The sooner the better thanx guys.