On 18/06/17 11:55, Andy Burns wrote:
The Natural Philosopher wrote:

Get some and put a blowtorch to it.
Celotex insulation does not really burn.

Where "not really" means that an external flame will make it burn,
giving off a surprising amount of smoke, it will char and and the flame
from the foam will sputter out after a few seconds when you take the
blowtorch away ... maybe a big slab with lower surface:volume ratio
performs better than tests on offcuts of an inch or two?

"Not really" means that at atmospeheric oxygen levels an endothermic
reaction happens. I.e. it does not burn, It decomposes under heat.

So, too, does plasterboard and fireproof board. In fact so too does
pretty much anything,

Burning means an exothermic reaction that is self sustaining in air.

like aluminium polyethylene foam panels, giving off a surprising amount
of smoke...

--
The biggest threat to humanity comes from socialism, which has utterly
diverted our attention away from what really matters to our existential
survival, to indulging in navel gazing and faux moral investigations
into what the world ought to be, whilst we fail utterly to deal with
what it actually is.