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>In a message dated 3/15/00 2:13:40 AM Central Standard Time, >simonm@ho*.co*.za* writes: > ><< I had a conversation with a long term hardened stroke over the weekend and >he told me that his non-crushed neoprene dry suit does not change its >buoyancy characteristics as he goes deeper because the helium that he uses to >inflate it penetrates the neoprene and stops it from crushing. >> > >Are You sure that he wasn't just pulling your leg. He couldn't be serious. The genesis of the conversation was the evidence that the non-crushed neoprene dry suit provided. The dry suit in question had been used to extreme depth by it's previous owner. As a result of this exposure the wrist seals which were previously non-crushed neoprene are now crushed neoprene seals. The neck seal which had been exposed to the Trimix used to inflate the dry suit was not permanently crushed. The theory put forward was that some helium was able to enter the cavities in the neoprene of the neck seal and upon ascent, when the pressure was reduced, helped the material to rebound. A similar (i.e. He also involved) event has been observed previously with an environmentaly sealed first stage. After being used as a stage bottle DV on a Trimix tank, it had quite a large buble of gas in the sealant fluid (glycol?). The bubble went down after a few days. This had not been observed before or since when using the DV with air. Larry. P.S. I am not the stroke in question, but do dive with him regularly (which makes me a stroke too). ------------------------------------------------------------------- 15 million lemmings can't be wrong. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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