At 10:35 23/10/95 EST, you wrote: >Maybe I'm missing your point, but...all the heat packs I've seen are >chemically activated in a sealed plastic bag. How would the gaseous >environment affect their performance? > I am begining to think that you don't get the type of heat packs I am refering to over there. I know the gel type you mean; they are re-chargeable. I have tried them and they are of limited value. The ones I am refering to are disposable, sold in sealed plastic bags, and start heating up when exposed to air. They give off a lot more heat for a lot longer which is why I use them. Mark Caney Scubex, Cyprus (Time zone: GMT + 2) Tel: +357-6246680 Mobile: +44-370-453321
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