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| Glass, Plastic and Stone Discuss machining Glass, Plastic and Stone here. |
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#1
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| Ok this is a question - but with a preface. 1. Glass - yes fairly easy to recycle - break it up, smash it, refloat in a kiln for art glass projects. 2. Stone - break it up, crush it - use it in your polymer composite frame - or driveway. 3. BUT - what about acrylic? I have a bunch of scraps left over from vacuum forming trimming - and would like to recycle somehow. Anyone have an idea - temperature - process - machine? Melt in a crucible? Again, temp and time -- done the "google" but no joy. ![]() Seems like it ought to be doable. Anybody done it? Jim
__________________ Experience is the BEST Teacher. Is that why it usually arrives in a shower of sparks, flash of light, loud bang, a cloud of smoke, AND -- a BILL to pay? You usually get it -- just after you need it. |
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#2
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| I would caution against experimenting by trying to melt it. Acrylic de-polymerises when it melts and produces the monomer methylmethacrylate which is very bad news for breathing. This is the harsh smelling stuff that you can smell when you overheat acrylic while machining.
__________________ An open mind is a virtue...so long as all the common sense has not leaked out. |
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#3
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| I'd like to keep this open - but after some more sleuthing - it seems like acrylic is made by reacting methacrylic acid with methyl alcohol. AND, it is often not taken at recycle centers - thats why I was interested - so maybe I'll need to find a better plastic to thermoform and have a "greener-waste-stream." JimAND http://www.enotes.com/how-products-e...crylic-plastic
__________________ Experience is the BEST Teacher. Is that why it usually arrives in a shower of sparks, flash of light, loud bang, a cloud of smoke, AND -- a BILL to pay? You usually get it -- just after you need it. Last edited by High Seas; 10-28-2008 at 11:44 AM. Reason: add reference |
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#4
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| Yes the methacrylic acid reacted with methanol gives methylmethacrylate which then spontaneously polymerizes to give poly methylmethacrylate, aka: PMMA, Plexiglas, Perspex or Acrylic. PMMA does not deteriorate except for surface crazing and stress cracking under some applications. It is not susceptible to ultra violet attack like many plastic which get brittle and does not use plasticizers which leach out causing the plastic to become brittle. I think the 'reforming' probably refers the the fact that large pieces that have not crazed or stress cracked can probably be refinished into smaller parts. I like the 'some acrylic are highly flammable' and would like to see one that is not.
__________________ An open mind is a virtue...so long as all the common sense has not leaked out. |
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