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[This message is converted from WPS-PLUS to ASCII] I noticed several messages dealing with dry suit inflation cylinders and argon. One specifically questioned the 6 cf pony and the inability to get high pressure Argon. I have the same cylinder and plan to get the most Argon I can and then top with air to 3500 psi. Everyone assumes you just have to have pure argon to stay warm. That's just not true. Your first priority should be to just not inflate your suit with a Helium mix. Look at these thermal conductivities for the various gases we are concerned about. They are listed at 60F, and the units (although it doesn't really matter for this discussion) are cal/(sec)(cm^2)(degrees C/cm) x 10^-6 Air 60.34 Argon 41.33 Helium 352.10 Nitrogen 60.34 Oxygen 61.58 No, there is no typo between air and nitrogen. If you can fill your cylinder to 2000 with Argon and then top to 3000 with air, you'll still be doing pretty well. It is the high percentages of He in bottom gas that will freeze you in a dry suit. Just fill the dry suit inflator tank with air and you'll be pretty well off. For the longer, colder hangs, add the Argon. Dive Safe, Scott
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