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BET and gas FAQs

What quality of gas is needed for use with BET and physisorption?
- Research grade is the answer, 99.999% pure is the ideal quality.
- Do not use grades suited to other general analytical instruments.
- Nitrogen must be oxygen free. Helium must be Nitrogen free (do not use Balloon gas)
What sort of Cylinder head regulator is suited to BET etc?
- Double stage regulator with a metal diaphragm is essential.
- The second gauge should read in the range up to 15 or 30 psi
- A stop flow valve after the regulator is a useful item.