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Date: Tue, 2 Jun 1998 19:48 +0100 (BST)
From: dwilkins@fi*.ci*.co*.uk* (David Wilkins)
Subject: Helium grades
To: techdiver@aquanaut.com
CC: dwilkins@fi*.ci*.co*.uk*

There are at least two different grades of helium available in the UK
which are certified as suitable for diving, namely '3.7' or minimum 99.97%
helium, and '4.5' or minimum 99.995% helium.

Question is, what are the practical differences (apart from cost)? Is
there a maximum recommended depth / ppHe for 3.7? What do people use/ what
is available around the world?

For the record, I have always ordered/ used 4.5, but have had 3.7
delivered by mistake on one occasion recently.



Dave
(dwilkins@fi*.ci*.co*.uk*)
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