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Recyled plastics?
Recyled plastics?
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Old 22nd May 2019, 08:55 PM   #1
PeteMcK is online now PeteMcK
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Default Recyled plastics?

Looking round for a recycled plastic construction material, came across HDPE, which is available in sheet form:
High-density polyethylene - Wikipedia

Any comments on its suitability, alternatives?

Cheers,
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 22nd May 2019, 09:16 PM   #2
jo-briggs is offline jo-briggs  United Kingdom
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It rather depends on what you want to do with it. You can't stick it to itself or anything to it to it, screwing or hot-air welding being two methods used, though introducing heat to sheet HDPE causes unreliable distortions, i.e. never the same twice. Finishing is another problem, usually the surface would be flamed to oxidise it or acid-etched to provide a surface which accepts paint or inks. Recycled sheet ABS is a much more malleable material, it can be moulded, heat bent, machined and bonded with MEK (Methyl Ethyl Ketone). ABS is hygroscopic, so superglue works as does epoxy. Before applying serious heat to ABS in order to mould it it needs to be oven dried for at least 24 hours (if you heat it undried it bubbles as the moisture evaporates), or about a week in the airing cupoard as long as there is no damp washing in there as well!

Hope this helps.

Last edited by jo-briggs; 22nd May 2019 at 09:21 PM.
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Old 22nd May 2019, 10:26 PM   #3
Cal Weldon is offline Cal Weldon  Canada
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Recyled plastics?
What he said ^
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Old 22nd May 2019, 10:34 PM   #4
PeteMcK is online now PeteMcK
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OK, what recycled plastics are available in sheet form, have hard durable surface, & aren't too heavy? (Where's SY when you need him :-)
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Old 22nd May 2019, 10:37 PM   #5
phase is offline phase  United States
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Is kitchen cutting board material, if that helps.
I like it for speaker baffles, or for reinforcing flimsy car doors around the drivers.

Sintra (sp?) is a popular plastic that’s easy to work with, won’t explode on the table saw as readily as other plastics. Is a sign making product available in several thicknesses.
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Old 22nd May 2019, 11:23 PM   #6
Cal Weldon is offline Cal Weldon  Canada
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Recyled plastics?
Pete,
What are you doing with it?
How thick do you want it?
How big do the sheets have to be?
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Old 23rd May 2019, 12:50 AM   #7
afa is offline afa  Australia
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This company makes recycled plastic sheet and plank products which might be suitable
Home Replas - Australia's Leading Recycled Plastic Manufacturer
Replas Enduroplank™ Per 1.2 Metre | eBay
cheers, Arthur
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Old 23rd May 2019, 03:38 AM   #8
PRR is online now PRR  United States
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If you wanted something 3/4" 19mm thick:

Trex deck boards say they are "made from 95% recycled materials, including reclaimed wood and sawdust as well as recycled plastic from many common household items such as grocery bags, shopping bags, and plastic over wrap."
Trex Select Composite Decking Board - The Home Depot
Decking Products | Materials & Deck Boards | Trex

I imagine that "composite" deck anywhere will be a similar formula.

Deck boards are customarily shy of 1"x6", but "fascia" can be had 0.56 in x 11.375 in x 12 ft (14 mm x 288 mm x 365 cm), big enuff for a small speaker.
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Old 23rd May 2019, 08:44 PM   #9
PeteMcK is online now PeteMcK
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Cal
What are you doing with it? - Just looking for a way to use up some of that plastic crap that's killing the planet, instead of cutting down trees for MDF & Ply for speaker cabs. there seem to be several plastics recyclers producing sheet product in Aus
How thick do you want it? 12 - 18mm
How big do the sheets have to be? small enough to fit into my Honda Jazz...(~1500x1800mm)
Seems the problem with most recycled plastics is they don't have a hard exterior surface i.e. prone to scratching, and very dense, i.e. f'in heavy (Built a deck out of a recycled plastic/bamboo composite, certainly built up my puny muscles)
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