The little triangle of arrows stamped on a plastic container is one of the most misunderstood symbols in everyday life. Most people read it as a promise that the item is recyclable. It is not. The triangle holds a number from 1 to 7, and that number is a resin identification code that tells you which plastic the item is made from. Whether your local program accepts that plastic is a separate question. Here is what each number means and what to do with it.
What the triangle really is
The chasing-arrows symbol with a number inside was created so recyclers could sort plastics by type, because different plastics melt and process differently and cannot be mixed. The code identifies the resin. It says nothing on its own about whether a facility near you will take the item. Two containers can carry the same number and still get different treatment depending on their shape and your local rules, which is why the what can be recycled checklist leans on shape as much as number.
The seven resin codes
#1 PET or PETE (polyethylene terephthalate). Clear water and soda bottles, and many food jars. This is one of the two most widely recycled plastics, accepted by nearly every curbside program. Empty and rinse it, and leave the cap on.
#2 HDPE (high-density polyethylene). Milk jugs, detergent and shampoo bottles, and many rigid containers. The other broadly accepted plastic. Bottles and jugs shaped with a neck are the safest bet in any bin.
#3 PVC (polyvinyl chloride). Pipe, some clear packaging, and older toys and blister packs. Rarely accepted in curbside recycling, and it should never be burned. Most PVC belongs in the trash unless a specialty program takes it.
#4 LDPE (low-density polyethylene). Plastic bags, bread bags, squeeze bottles, and stretchy film. Curbside programs do not want the bags and film, because they jam sorting machines. Clean bags and wrap go back to the store drop-off bins many grocers offer.
#5 PP (polypropylene). Yogurt tubs, margarine containers, medicine bottles, and many takeout containers. Acceptance is growing but still varies. Check whether your program takes tubs and rigid number 5 containers before you bin them.
#6 PS (polystyrene). Foam cups, egg cartons, meat trays, and disposable cutlery. Expanded foam is not accepted in most programs and is best avoided at the store when you can. A few communities run special foam drop-offs.
#7 Other. A catch-all for everything that does not fit 1 through 6, including multi-layer packaging and some bioplastics. Number 7 is rarely recyclable curbside because it can be almost any material or a blend of several.
The short version for a busy day
If you remember nothing else, remember this. Numbers 1 and 2 in a bottle or jug shape are almost always accepted. Number 5 is a maybe that depends on your program. Numbers 3, 6, and 7 are usually trash for curbside, and number 4 film belongs at a store drop-off. When the number and the shape disagree, trust your local program's published list over the triangle.
Symbols that are not the resin code
A few other marks show up on packaging and cause their own confusion:
- The Möbius loop (three arrows, no number) means an item is capable of being recycled, not that it will be accepted where you live.
- A percentage inside the loop indicates recycled content, telling you how much of the product was made from recycled material.
- The How2Recycle label spells out in words which parts to recycle and which to trash, and it is the clearest of the bunch when a package carries it.
- The green dot (two interlocking arrows) is a European producer-fee mark and says nothing about recyclability, so ignore it here.
Why the number is not a guarantee
The gap between "made from a recyclable plastic" and "recycled in practice" is the whole problem. A container can carry a valid resin code, arrive clean at a facility, and still go to the landfill because there is no buyer for that plastic in that region. Markets for numbers 3, 6, and 7 are thin, so even willing programs often cannot move the material. Reading the number correctly is useful, and pairing it with your local accepted-materials list is what keeps plastic out of the trash.
Questions people ask
Does a higher number mean harder to recycle? Loosely, yes. Numbers 1 and 2 have strong markets and wide acceptance, while 3 through 7 are harder to place. The number is a material code, though, not a difficulty ranking, so always confirm with your program.
No number on my container. Now what? Some items are too small or flexible to stamp. Fall back on shape and material: a rigid bottle or jug is a better candidate than a film wrapper or a foam tray, which usually belong in the trash or a store drop-off.
Are the caps recyclable? Leave plastic caps on empty bottles. Loose caps are small enough to fall through sorting screens, so keeping them attached is the safer choice.