Author Topic: Plastic caught fire in microwave  (Read 3236 times)

Offline Steve J

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Plastic caught fire in microwave
« on: 08/14/16 15:39 UTC »
I have read quite a bit about making plastic but haven't heard this one.
I had shot a couple of molds now time to reheat.
While in microwave it caught fire obviously too much heat does anyone know just what the temps get to when it becomes combustible?

Offline andrewlamberson

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Re: Plastic caught fire in microwave
« Reply #1 on: 08/14/16 15:47 UTC »
No...but when PVC catches fire you have an emergency toxic event!

http://custombaits.com/index.php?topic=3183.msg21896#msg21896

The primary ingredient in our soft plastic is PVC (Polyvinyl chloride)  which is everywhere in our lives. When you add a plasticizer you get a "soft" PVC that are used in children's toys, teething rings etc. You can also find it on the cage of your dishwasher and other places that might make you nervous if you knew what it was! Due to the low melt point...it is not used in any cooking containers...plus there is a significant issue with burning PVC (see below).

If you add enough plasticizer...you get "soft plastic baits".

The good news is that CCM plastic is phthalate free. Phthalates have been linked to cancer and disruptions of the hormone system. If you are using a plastic that has pthalates (only a few are phthalate free because phthalate is a cheap plasticizer) I would REALLY not use it around the kids.

If you read the MSDS or talk to an Industrial Safety person or Chemical Engineer they won't be especially concerned about PVC....but...

BUT ...that's the end of the good news!

The BAD news is that when PVC starts to burn it releases VERY toxic fumes in the form of chlorine (PVC is approximately 50% chlorine) and dioxin  which are very...very toxic. When the chlorine from burning PVC reaches your lungs (or eyes) it forms hydrochloric acid (as in the stuff they used to gas enemy troops in WW1 !!!!).

If PVC is burning you have a "toxic event" and you need to clear the area! This is also why you need to wear a Respirator when heating PVC...because if you goof up (and we all do !) and the stuff starts to smoke and burn.....YOU HAVE A TOXIC EVENT!

Burning PVC (like in carpet, toys, luggage, toys, packaging, siding on the house, wires,  etc. etc) is one of the reasons why Firemen wear oxygen masks!

So...NO....don't use it the same microwave as your food! And wear a respirator when heating PVC....because sooner or later...you screw up...and get it too hot!



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