Outgassing info on pink/blue foam boards: http://www.sumidacrossing.org/SumidaCrossing/MaterialSafety.html
"The typical “insulation” foam panels, including Owens-Corning’s pink Foamular brand, are Extruded Polystyrene (XPS), which is basically gas bubbles trapped in foamed plastic which has been extruded, so the foam is easier to cut along its length. At present, the gas used is typically a hydrochlorofluorocarbon (HCFC), which is “relatively non- toxic” and harmless to humans in the small quantities released by cutting foam (it is bad for the ozone layer, however)" "I have seen some online comments about outgassing, but aside from burning it, there’s nothing in the MSDS about airborne hazards other than dust from polystyrene foam. Polystyrene is a stable material, which does not decompose over time (unless exposed to ultraviolet light, e.g., sunlight). Urethane-based foams are a different matter, and this may be the root of some of the confusion in online posts about foam materials." -------------------------- So, Polyurethane foams do outgas something nasty and decompose , but none of us use even buy or use them. Dow claims Polyiso (Thermax and Super Tuff-R) does not outgas anything harmful. But the "hydrocarbon" blowing agent is a secret. Jury is still out on pink/blue polystyrene. Unless somebody has a document. -- You received this message because you are subscribed to the Google Groups "hexayurt" group. To post to this group, send email to hexayurt@googlegroups.com. To unsubscribe from this group, send email to hexayurt+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/hexayurt?hl=en.
