TL;DR
In practice only two plastics have strong domestic end markets: PET bottles marked 1 and HDPE jugs marked 2. The resin code stamped in the triangle is an identification number, not a promise that anything recycles it.
That misunderstanding is the root of most recycling confusion. Once you know the codes are labels rather than guarantees, the rest of the system makes sense.
The Resin Code Is Not a Recycling Symbol
The chasing-arrows triangle with a number inside was created by the plastics industry to identify polymer type so processors could sort material. It was never a claim that a given item is collected or recycled where you live.
The arrows made it look like a recycling symbol, and the confusion has been baked in ever since. Some states have moved to restrict the arrows for exactly this reason.
What determines whether something recycles is not the number. It is whether a buyer exists for that polymer in that form, in your region, at a price that covers collection and sorting. Shape matters as much as chemistry.
What Each Code Means and What Really Happens
| Code | Polymer | Common items | Real-world outlook |
|---|---|---|---|
| 1 | PET | Water and soda bottles, clamshells | Bottles: strong market. Clamshells: weak |
| 2 | HDPE | Milk jugs, detergent bottles, buckets | Strong market, natural and colored both |
| 3 | PVC | Pipe, siding, blister packs | Essentially no household recycling |
| 4 | LDPE | Bags, film, squeeze bottles | Store drop-off only, never curbside |
| 5 | PP | Yogurt tubs, takeout containers, caps | Improving but inconsistent by region |
| 6 | PS | Cups, foam, cutlery | Almost never accepted |
| 7 | Other | Multilayer, bioplastics, mixed | No market. This is the catch-all bin |
The two winners are clear. PET bottles and HDPE containers have established reprocessors, stable buyers, and enough volume to justify a sort line position.
Polypropylene has improved in a number of markets but is still program dependent. Everything else is either drop-off only or landfill. This is the reality behind the numbers in how much of a load gets recycled.
Why Shape Matters as Much as Polymer
A materials recovery facility sorts by machine at speed, and machines identify items by shape and by how they behave on a belt as much as by material.
Bottles are rigid, three dimensional, and roll predictably. Optical sorters read them reliably and air jets kick them into the right bin.
A PET clamshell is the same polymer as a PET bottle but it is flat, light, and often has a label covering the surface the optical scanner needs to read. It also has a different melt behavior because of how it was formed, so reprocessors do not want it mixed into bottle bales.
That is why programs say "bottles, jugs, and tubs" rather than "number 1 and number 2." They are describing shapes a machine can handle, which is the same logic behind how to sort junk for recycling.
Bulky Rigid Plastics Are a Separate Stream
Big rigid plastic items are a genuine bright spot and one most people do not know about. Laundry baskets, storage totes, plastic lawn furniture, kids play structures, buckets, plastic pallets, and empty plastic drums are usually molded from HDPE or PP in thick sections.
Many transfer stations and depots take bulky rigid plastic as its own category. It grinds cleanly and has real value because the polymer is thick, uniform, and unpainted.
The items that do not qualify are ones with metal frames, upholstery, foam, or mixed materials bonded together. A plastic chair with steel legs needs the legs off, or it goes to landfill.
If you are clearing a garage full of cracked totes and broken lawn chairs, ask whether your local site takes bulky rigids before assuming it is all trash.
The Film Problem
Plastic film, meaning grocery bags, bread bags, produce bags, dry cleaning film, bubble wrap, and shipping envelopes, is the single most damaging contaminant in curbside recycling.
Film wraps around the spinning shafts of the screening equipment at a sorting facility. Crews shut the line down and cut it off by hand, sometimes daily. That downtime is expensive, and it is the reason every program in the country says no bags in the bin.
Store drop-off programs at grocery and retail chains have historically collected clean dry film for composite lumber manufacture. Whether any specific chain is still running one, and what they accept, changes over time, so check at the store rather than assuming the bin is there.
The other rule is absolute: never bag your recyclables. A bagged load of otherwise perfect recycling gets pulled off the line unopened, because nobody at a sorting facility opens unknown bags.
Wishcycling Makes Everything Worse
Putting a questionable item in the bin hoping it gets recycled feels harmless. It is not.
Contamination lowers the value of the bale, and enough of it gets a whole load rejected and landfilled, including all the good material in it. Food residue soaks into paper. Liquids ruin cardboard. Non-recyclable plastic ends up in a bale a buyer refuses.
The correct default is the opposite of what most people do. When in doubt, throw it out, and look up the specific item on your hauler's accepted-materials page when you have a minute. That is what what responsible disposal means comes down to in practice.
Empty and dry is the other rule that costs nothing. A rinsed container is worth something. A peanut butter jar with two inches of peanut butter in it is a contaminant.
FAQ
Should I recycle plastic bottle caps or throw them away?
Most programs now want caps screwed back onto empty bottles. Loose caps are too small to sort and fall through screens, but attached to a bottle they ride through the process and get separated at the reprocessor. Check your local guidance, since a few programs still say remove them.
Are compostable and bioplastic containers recyclable?
No. Bioplastics contaminate conventional plastic recycling, and most only break down in a commercial composting facility. If your city does not run a commercial compost program that specifically accepts them, they go in the trash.
Why does my city accept different plastics than the next town over?
Because each program's list reflects the equipment at its sorting facility and the buyers its material broker can reach. Two neighboring cities can use different facilities with different capabilities. Always use your own hauler's list, not a general online guide.
Do I need to remove labels from plastic containers?
No. Labels are removed during washing and grinding at the reprocessor. What matters is that the container is empty and reasonably clean. Do not spend water scrubbing containers, since a quick rinse is enough.
What happens to plastic that cannot be recycled?
It goes to a landfill, where it is inert and stable, or in some regions to a waste-to-energy facility. Neither is a great outcome, which is why reducing the number of single-use plastic items you bring home does more than sorting them carefully afterward.
Clearing Out Bulk Plastic
Storage totes, broken patio furniture, kids play sets, and old bins fill a garage fast and are exactly the kind of bulky rigid plastic that has somewhere better to go than a landfill. Junk removal sorts the rigids out of a load and routes them to a depot that takes them. If you have a pile of it, look through what you can recycle during a junk pickup first, then get a quote.