A case of carbonara

comradekingu

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https://pyra-handheld.com/boards/threads/even-more-to-see-here-now.83733/page-13#post-1455694

The pelleters are in

Looks to be AZ1900 https://www.idemitsu.com/products/petrochemicals/engineering/grade/index.html

https://www.materialdatacenter.com/ms/en/Tarflon/Idemitsu+Chemicals/TARFLON®+AZ1900/71236e94/5766

Bromo and phosphour are bad, so those are just out, but there are some glass fiber reinforced ones. Don't know how that works with wireless signals, or heat transfer/buildup.

With a bit of research we might learn more about this aspect of the pyra, luckily the people doing it know what they are doing, and the AZ1900 look to be good.

Having something recycled from the ocean plastic is all the rage, but I don't think (?) it can be combined with something that doesn't leak any carcinogens.

Willing to pay for a special run if something interesting shows up.
 

levi

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I'm not sure much of that floating about is polycarbonate to be honest. I'd expect most of it to be polyester and polystyrene and maybe some polythene by the amount used in the world. Polycarbonate's main use in in disc storage, and personally I've only ever put a handful of CDs and DVDs in the trash.
 

comradekingu

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But CDs might have that reflective stuff still in there. Maybe with a machine that sands down the top and bottom. Is there anything else made of PC that one might find floating around? Doesn't it sink because of the density? Military stuff is nice and sturdy. Does it even work to re-melt stuff and recycle it that way?
 
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levi

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Polycarbonate apparently doesn't thermoset, so remoulding polycarbonate stuff should be pretty easy at the required temperatures. On a commerical mastered CD or DVD there's a layer of laquer at the top and then the reverse of the aluminium layer. You don't need to sand the bottom to remove the silvery layer. You might need to sand the top of a double layer DVD a bit further. and then there's the burnable layer in writeable and rewriteable discs and I don't know off the top of my head exactly where that is though.

Wikipedia has the example of a phone back panel that's made of polycarbonate, and in the olden days I've had toothbrushes with clear handles that might well have been polycarbonate. It's hard to identify though as the recycling code for polycarbonate is just '8 - other', so it might equally as well been acrylic.
 

Grench

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Why would you toss perfectly functional coasters? :p

-God Ginrai
The hole in the middle.

I tried to turn one into a primary lens for a homemade telescope by putting it in a wok and heating it in an oven. I could get it to focus light to a blurry patch. Not even fine enough to use as a fire starter.
 
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