Kris

Teflon can certainly outgas (if it has recently been let up to air). This
caused problems for us in isotopic analysis of hydrogen in vessels
where the valve stems were made of teflon. See:

Heaton, T.H.E. and Chenery, C.A., (1993). Caution on the outgassing of
polytetrafluorethylene valves used in the isotopic analysis of hydrogen.
Chem. Geol. (Isotope Geoscience section), 106,485-487.

Tim Heaton
NERC Isotope Geosciences Lab
British Geological Survey
Keyworth
Nottingham NG12 5GG, UK

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