![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
Freon-free Foam
Via Instapundit, this fellow posits that the problems with the Shuttle external tank shedding foam relate to a 1997 change from foam made using freon to a CFC-free foam. I couldn't tell you whether he's right or not, but the anecdotal evidence he cites is pretty ugly.