What the Recycling Numbers and Symbols Actually Mean
Here’s the thing almost nobody tells you: the little triangle with a number on a plastic item tells you what the plastic is made of, not whether you can actually recycle it. That one misunderstanding is why so much ends up in the wrong bin. Here’s what the recycling numbers and symbols really mean, and how to know for sure what goes where.
The recycling symbol doesn’t mean recyclable
The chasing-arrows triangle you see on plastics is called the resin identification code. It was created to help sorting facilities identify the type of plastic, not to promise you it’s recyclable. A number 5 tub might be accepted in one town and refused in the next. So when you see the symbol, read it as a material label, not a green light.
What the numbers 1 to 7 mean
Each number is a different type of plastic. Here’s the quick version:
Number | Plastic | Common uses | Usually recyclable? |
|---|---|---|---|
1 (PET) | Polyethylene terephthalate | Water and soda bottles, food trays | Yes, widely |
2 (HDPE) | High-density polyethylene | Milk jugs, cleaning product bottles | Yes, widely |
3 (PVC) | Polyvinyl chloride | Pipes, some packaging, cling film | Rarely |
4 (LDPE) | Low-density polyethylene | Plastic bags, wraps, squeeze bottles | Only at store drop-off |
5 (PP) | Polypropylene | Yogurt tubs, bottle caps, straws | Often, check locally |
6 (PS) | Polystyrene | Foam cups, takeout boxes, cutlery | Rarely |
7 (Other) | Everything else, including bioplastics | Mixed materials, some compostable plastics | Rarely |
As a rough rule, 1, 2, and 5 are your best bets for curbside recycling. 3, 6, and 7 usually are not.
The other symbols you’ll spot
Numbers aren’t the only marks on your packaging. A few you’ll run into:
Mobius loop (plain chasing arrows, no number): the item can technically be recycled, but not everywhere.
Green Dot (a circle of two arrows): this does not mean recyclable. It means the producer paid into a recycling scheme, mostly in Europe.
How2Recycle label: a genuinely helpful US label that spells out which parts to recycle and how.
A crossed-out bin: do not put this in your household recycling.
Why the same item is recyclable in one place and not another
Recycling comes down to what your local facility can process and find a buyer for. Two neighboring towns can have completely different rules for the exact same yogurt tub. That is why “is this recyclable?” is really “is this recyclable where I live?” When in doubt, checking your local rules beats guessing, because tossing the wrong thing in can contaminate a whole batch. We covered more of the tricky items people get wrong if you want the full list.
The easy way to know for sure
If reading symbols and local rules for every item sounds like work, that is where an app helps. With Plastnofy, you point your camera at anything you’re unsure about and it tells you how to get rid of it, sorted into recycle, compost, return, or landfill, with the quick steps and based on your actual city. It works as part of a sustainable cleaning app that also handles your chores and checks your products, so the answer is one photo away. And it’s free to start.
Download Plastnofy free on the App Store and Google Play.
The bottom line
The number on a plastic tells you what it’s made of, not whether it belongs in your bin. Learn the quick rule (1, 2, and 5 are usually fine), check your local rules for the rest, and when you’re stuck, a photo beats a guess.