On 24/06/17 11:45, Vir Campestris wrote:
On 24/06/2017 10:59, dennis@home wrote:
On 24/06/2017 09:35, Martin Brown wrote:
On 23/06/2017 16:05, newshound wrote:
On 6/23/2017 3:36 PM, dennis@home wrote:
On 23/06/2017 13:46, Martin Brown wrote:
On 23/06/2017 12:43, The Natural Philosopher wrote:
On 23/06/17 11:34, Martin Brown wrote:
On 23/06/2017 09:23, The Natural Philosopher wrote:
On 23/06/17 09:09, Martin Brown wrote:


If it is decomposing and oxidising it produces heat at a rate
that is determined by the mass loss per unit time and how
completely it is oxidised.

No. Google endothermic reaction

Endothermic oxidation reactions are incredibly rare (are there any
apart from the formation of ozone?). To the best of my knowledge
burning Celotex certainly isn't one of them.

Burning PVC is one as are many other plastics.

You are a clueless ****wit. PVC burns with a lot less energy released
per unit mass than polyethylene but it still burns exothermically if
there is sufficient oxygen available or at elevated temperatures.

You are clueless, its self extinguishing and takes energy to burn.
It may well start to burn at 450C but that is because it is taking the
energy from where ever the heat is coming from.


With wood applying 450c to it will ignite it and it will continue to
burn if you remove the heat source that does not happen with PVC as
the burning is endothermic and it goes out!

You need to think before you post or people will know you are clueless.
Now I think I will put you in the same category as TNP, a waste of space.

"Other advantages of PVC are that it releases less combustion heat than
other plastics - hence contributes less to maintaining and spreading
fire €“ and produces no or very few flaming droplets or debris."

http://www.pvc.org/en/p/fire-retardant-properties

That's the PVC manufacturing industry putting a positive spin on it.
Read that page - and remember who is writing it.

Andy


Effective heat of combustion of PVC is 17.95 MJ/kg

https://en.wikipedia.org/wiki/Polyvinyl_chloride


26MJ for PIR foam

https://books.google.co.uk/books?id=...nurate&f=false


As these are both positive numbers, any claim of either being
endothermic appear to be incorrect.