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I was putting the stuff with my curbside recycling and they take it but if I can find someone to buy it i will go that route.

Generally yes, in more recent times almost always. But as you get older and older like 80s, 70s, others were used as well.

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-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.

How can you tell the metal infused plastics? I have a few thousand pounds and don't wanna mess up the melt by including that.

Shiny and/or metallic looking. If it has metal it’s quite obvious. If you have ever seen the inside of a cell phone shell or the fancy “chrome” on low end appliances.

Speaking of metal, keep in mind there’s a difference between infused and coated.
Coated is usually copper, or nickel (shielding), gold, or chrome for appearance.
Scratch the surface to see if it is deeper. Separate coated from infused. Coating spray can be quickly removed with chemical treatment and recovered.

Infused has particles throughout it. Actual infusion is quite rare. You can tell by using the scrape method. And breaking anything that is still questionable. Regardless of metal used infusions will always have a slightly metallic shimmer if moved around under lighting.

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-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.

Automotive reception scrap buyers tend to take chrome, tin, nickel, and Carbon Fibre plastics. Nickel as well.
Good place to look into old 8-bit era computer case dumping since it’s used in automotive plastic all the time.

The same company shredding and recovering chrome infused door handles will happily add chrome infused appliance plastics; normally PP, or ABS. That includes the buttons on the outside of fancy cases and the plastic shields from expansion card backs.

I found aluminium can processors were happy to take plastic foils. Like stickers and labels. Even dog treat bags. They take aluminium infused HD compressed polystyrene too. Like shiny semi-transparent clam shells.
And aluminium coated blister packs.
Travel and sample pill packaging. Gum wrappers and cigarette pack liners. (The plastic verity, not paper). Some even take hologram and foil trading and greeting cards. Paper layer and all.

It’s been a few months but till then I’ve lately been selling my infused plastics for half #3 shred rate to my steel buyer in sub-50lb lots.

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-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.