Unkown plastic

Unkown plastic

This topic has 8 replies, 6 voices, and was last updated 9 July 2020 at 15:29 by Adam Mara.

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8 July 2020 at 09:42 #30036
Gary Wooding
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@garywooding25363
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8 July 2020 at 09:42 #484550
Gary Wooding
Participant
@garywooding25363
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?
8 July 2020 at 10:05 #484557
SillyOldDuffer
Moderator
@sillyoldduffer
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.

Dave
8 July 2020 at 10:13 #484559
DiogenesII
Participant
@diogenesii
"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..
8 July 2020 at 18:29 #484615
Chris Evans 6
Participant
@chrisevans6
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"
8 July 2020 at 19:55 #484630
Martin Kyte
Participant
@martinkyte99762
Second vote for Polycarbonate.

regards Martin
9 July 2020 at 14:01 #484750
Gary Wooding
Participant
@garywooding25363
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?
9 July 2020 at 15:29 #484766
Adam Mara
Participant
@adammara
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.
9 July 2020 at 15:29 #484767
Adam Mara
Participant
@adammara
Duplicate post!

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