polyisocyanurate

[zook250]

has anyone ever tried this as a absorber/diffuser? it has the appearance of sponge toffee. ie. crunchie bar, yellow inside. it is made by firestone and is used as a rigid insulation on building exteriors. it is usually foil backed, but the foil can be peeled off. it comes in all thicknesses.

we have sheets of this stuff at work that has been sitting in a shed for years.

 

[Jblount]

Wow I'm hungry now, but my doctor said to avoid polyisocyanurate.

JK, what are the sound absortion ratings for the product? You can probably go to the manufacture's website and find out.

 

[TimOBrien]

Don't know anything about the product, but the "cyan..." part of the name should tell you not to use it.

If you ever have a fire, you'll probably be releasing toxic cyanide gas into your space. Probably why they only call for it to be used on exteriors. Sound like fun????

 

[ebeam]

Its a type of polyurethane foam. Commercial polyurethane generally has some percentage of polyisocyanurate in it. This is a closed-cell foam, which is generally not preferred for acoustic applications from what I understand. I wouldn't worry about fire so much though - it should behave pretty much like polyurethane.