[SML] polystyrene decoration on fire again

[e-mail frank.wood95]

What was the source of ignition?

Many years ago, one of our set designers planned to use polystyrene to
make some gothic arches. As LD, I was worried, so I conducted an
experiment. I set up a 2' square panel, from the packaging of a
domestic appliance, and pointed a 1KW VNSP Par at it from about a foot
range. After an hour, the polystyrene panel was noticeably thinner
where the beam had fallen on it, but that was all.

OTOH, I remember going up a wooden step-ladder to adjust the 1KW PAR
cans I was using in booms. By the time I had finished, smoke was
coming from the ladder.

Safety experts, please advise.

On 26 July 2015 at 05:28, Jerry Durand via Stagecraft
<stagecraft at theatrical.net> wrote:
> Las Vegas
>
> http://www.rt.com/usa/310759-vegas-hotel-roof-fire/
>
> --
> Jerry Durand, Durand Interstellar, Inc.  www.interstellar.com
> tel: +1 408 356-3886, USA toll free: 1 866 356-3886
> Skype:  jerrydurand
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-- 
Frank Wood