The piece of foam that came off was from an area where "environmentally
unfrendly" foam was used. Page 51 "BX-250, a polyurethane foam appied with
CFC-11 chloroflorocarbon, was used on domes, ramps, and areas where the foam is
applied by hand." The chunk came from the left bipod ramp, where BX-250 foam
was applied by hand.

http://info-pollution.com/Hacker.htm
http://info-pollution.com/challenger.htm

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Anti-environmental myths
http://info-pollution.com/myths.htm
Practical skepticism
http://info-pollution.com/skeptic.htm