[Tunehead54]

The formula was changed around 1996/1997 to make it more "environmentally friendly." I'm sure that no consideration was given to manned space flight safety when this happened.

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They yanked the freon to save the ozone layer. The ice would only form UNDERNEATH the insulating layer if the insulation had already come "unglued" - compared to the billions of A/C units using freon WHATEVER the shuttle used would be akin to peeing in the ocean - and putting our guys and gals with the right stuff at risk for no reason. Sigh.

[Jael]

One article mentioned the freon as if it were a culprit in and of itself. Said it was "a very volatile gas".