How can I tell which resin code a plastic item actually is if it's not labelled?
Short answer: Most manufactured plastic items are molded with a small resin identification code, usually a triangle symbol containing a number from 1 to 7, somewhere on the item, often on the bottom of containers — if that marking is genuinely absent or worn away, a buyer with plastic identification experience or equipment can often identify the resin type, so it's worth asking rather than guessing or defaulting to a mixed-plastic listing.
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List Free →Where to look for the resin code first
Most plastic packaging and many manufactured plastic products carry a small molded triangle symbol with a number inside, typically located on the bottom or an inconspicuous surface — checking there first resolves most identification questions without any special equipment.
What to do if the marking is missing or worn
Some older items, certain manufactured products, or plastic that’s been damaged or worn may lack a visible or legible resin code — in these cases, a buyer experienced in plastics identification can sometimes identify the resin type through visual and physical characteristics, or specialized equipment for more certain identification.
Why it’s worth confirming rather than guessing
Misidentifying a resin type and mixing it with the wrong sorted batch can contaminate an otherwise clean, single-resin load, which risks the entire batch being downgraded — when genuinely unsure, it’s safer to keep unidentified pieces separate and ask a buyer, rather than guessing and risking contamination.
How ScrapTrade Makes This Easier
If you have a quantity of unidentified plastic, describing it honestly as “unmarked, resin type unknown” in a ScrapTrade listing lets buyers with identification capability quote appropriately rather than risking a contaminated sorted batch.
Ready to sell or source plastic scrap without the guesswork? ScrapTrade connects verified buyers and sellers with escrow-protected payments and transparent weighing.
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