Hi.

 

I put Great Stuff pestblock (polyurethane foam), around the heater pipes. I didn´t realize that the product manufaturer says not to do that. I didn´t have problems during the application (I know this the principal concern when they warn no to do it). And I know the temperature of the pipes is in the allowed range (far lower than 240 F). Now I don´t know if I need to remove all the product from those pipes or if I can leave it, since the temperature is not too high. I´m afraid for a risk of fire or the product could in contact with the hot pipes free some harmful chemicals.

 

I appreciate very much your response.

 

Claudia

I don't think there would be a fire hazard. From a search online polyurethane foam doesn't ignite till 600 degrees F. Maybe it is a melting thing.

From Dow's safety sheet:

_______________________________

• GREAT STUFF PRO™ foam should not
be used around heaters, furnaces,
fireplaces, recessed lighting fixtures or
other applications where the foam may
come in contact with heat-conducting
surfaces. GREAT STUFF PRO™ foam is
combustible and will burn if exposed to
open flame or sparks from high-energy
sources. Do not expose to temperatures
above 240°F (116°C).

________________________________

The material degrades and becomes brittle over time at high temperatures, and may (speculating here) even char slowly at temps above 240F. (Wood in contact with steam heating system plumbing often chars slowly over time.)

If your heating system is pumped hot water, that's a higher temp than most hydronic boilers can deliver, and most residential steam heating doesn't reach that high either.

Don't worry, B-happy.