On Nov 6, 8:40 am, (Chris Lewis) wrote:

Rockwool has no binders

Roxul's Rock Wool Insulation MSDS, available on their Web site,
contradicts this, saying that it contains one to six percent "Cured
Urea Extended Phenolic Formaldehyde Binder." The binder undergoes
"thermal decomposition" above 200 degrees Celsius, releasing the usual
suspects as gases. "Acrid smoke may be generated during a fire."

http://www.roxul.com/graphics/RX-NA/...xul%20Material
%20Safety%20Data%20Sheet%2004-1-071.pdf

--Eric Smith