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Jknober (Industrial) (OP)
9 Mar 11 11:16
I am developing a product and the plastic that the manufacturer used on the product seems to be brittle and i am trying to identify it.

This is supposed to be a heat resitant plastic. It is shiny black on the outside with licroscopic bumps. On the inside it has a dull finish that looks like foam. The edges are are easily chipped leaving the dull look. A sharp knock on the product can break off a piece of it.

Any help identifing this would be greatly appreciated.
patprimmer (Publican)
9 Mar 11 11:34
The information you provided is almost totally useless to use to identify the plastic.

Two simple tests will start to narrow it down.

Does it float on water.

Does it melt before it burns if you slowly bring it to a flame.

A more complex test is to observe and smell the smoke as it smolders, but take extreme care as several plastics produce VERY toxic smoke and some burn profusely and drip flaming drops.


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Pud (Mechanical)
9 Mar 11 13:08
Here you go:

Acetal is pretty good to clear one's sinus', Flourpolymers can cause bone necrosis, but I would guess you have neither of those...

Your experience may differ.

patprimmer (Publican)
9 Mar 11 14:46
Polyurethane also produces cyanide as it burns and PVC produces hydrogen chloride fumes which turn into hydrochloric acid on contact with water, including water in your eyes, nose and throat.

The gas from acetal is formaldehyde. It is more noxious than toxic. It certainly packs a punch.

Some thermosets also give off formaldehyde when burnt, but they do not melt or shrink from the flame.

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Pud (Mechanical)
9 Mar 11 17:52
Hey Pat, I forgot all about the joys of PVC! Good job it doesn't burn!

I once set fire to a CA guitar pick over my desk to illustrate flammability to a customer - still got the scorch marks! Burns pretty quick (understatement!)


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