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Unkown plastic

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Gary Wooding08/07/2020 09:42:57
821 forum posts
211 photos

My wife has an empty cosmetics jar. It's quite small and looks and feels very much like cut crystal glass. The fingernail test says glass, but the tooth test says plastic. Any idea what it could be?

SillyOldDuffer08/07/2020 10:05:15
7019 forum posts
1549 photos

Probably polycarbonate - it's used to make pub glassware, spectacle lenses, eye-protection and Covid shields. There must be several grades because lemonade bottles are made of it too, and they're nothing like glass.


DiogenesII08/07/2020 10:13:54
213 forum posts
108 photos

"Crystal" styrene would probably be the popular choice for an optically clear moulded product.. it's probably the only polymer that is clear enough / has the most convincing refractive properties to look like glass.. you'll be able to tell if you can burn a fragment of it - it's distinctively acrid..

Chris Evans 608/07/2020 18:29:37
1880 forum posts

I have made perfume top moulds in my working life. Crystal Styrene is a possibility, when making the tooling we where told the moulding material was "Acrillic"

Martin Kyte08/07/2020 19:55:47
2309 forum posts
38 photos

Second vote for Polycarbonate.

regards Martin

Gary Wooding09/07/2020 14:01:39
821 forum posts
211 photos

I tried the hot needle test and the fumes were certainly not acrid. Not unpleasant at all really. So presumably not Crystal Styrene.

Are there similar tests for the other suggestions?

Adam Mara09/07/2020 15:29:07
141 forum posts
10 photos

Please remember that many plastics give off toxiic fumes when burnt. At work we did not cut any unidentified plastics on our commercial laser cutter.

Adam Mara09/07/2020 15:29:08
141 forum posts
10 photos

Duplicate post!

Edited By Adam Mara on 09/07/2020 15:29:50

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