[Jael]

http://ltp.arc.nasa.gov/space/team/journals/katnik/sts87-12-23.html

During the STS-87 mission, there was a change made on the external tank. Because of NASA's goal to use environmentally friendly products, a new method of "foaming" the external tank had been used for this mission and the STS-86 mission. It is suspected that large amounts of foam separated from the external tank and impacted the orbiter. This caused significant damage to the protective tiles of the orbiter.

[craig_eddy]

environmentally friendly products

They'll kill us all before it's over.

[Mo1]

I keep reading that about the tanks ..

I don't want to get the wrong impression but what does NASA mean by "environmentally friendly"

[fooman]

I think that it is you that brought this up yesterday. IF, IF this were true, it would be ironic that PC kills here.