"G.E.R.R.Y." wrote in message

Another thought just occured...styrofoam?

We used to regularly use sheets of styrofoam in classrooms for large,
very cheap bulletin boards until the school board banned their use
because, if there is a fire, they burn easily and emit cyanide gas.
That was back in the Sixties and I don't know if the chemical
composition of styrofoam has since been changed. I think I'd definitely
want to find out first.

Gerry

It does not now nor has it ever given off cyanide gas. Styrofoam is Dow
Chemical's trademark for an extruded polystyrene board. Thee is also
expanded polystyrene that is often galled Styrofoam mistakenly. The
products of combustion for either of these products in carbon dioxide and
soot.

Modified versions do not burn easily. They burn no more than paper, wood,
and less than vinyl and many other materials. Foam products used in
construction, according to code, or in a bulletin board must be made of
modified material what will not burn if the source of ignition is removed.
Food items do not have that additive. Take a piece of foam insulation and
take it outside. Put a match, lighter, or torch to it. It will burn, but
if you take the flame away, it will go out.

There are other foam materials out there and I do not know what they do if
burned. There is much good information from independent sources if they care
to find out the facts.