One of the nafion dryers I work with was an OEM (original equipment
manufacters) from Perma Pure. Unfortunately, Perma Pure no longer makes
the dryer in this size any more. They did have the nafion tubing size I
needed so I purchased some in hopes of making a new dryer element.
I also had small stainless inserts made for the ends of the tubing. I
have been using methanol to expand the tubing so I can place the insert
inside it. Can too much methanol damage the tubing?
My problem is that no matter what I do, the tubing seems to be leaking He
carrier flow from my GC. Thinking that my leak may have not been a leak
through the tubing itself and that it may be the result of a bad o-ring
seal I went one step futher and heat shrinked the ends to increase their
OD and replaced the o-ring. However, this has not helped so far.
I have inspected the tubing and it seems to have many abnomalities along
its length. Is it possible to have a bad run (extrusion) of the tubing?
If you have any suggestions I'd appreciate it.
Brian M. Giebel
Univ. of Miami / RSMAS