Found in water bottles, soda bottles, and salad dressing containers. Widely accepted by most recycling programs, though these plastics are usually downcycled into items like carpets or clothing rather than new bottles.
How to Read Recycling Symbols

If you've ever flipped over a plastic container and noticed a little triangle with a number inside, you've probably wondered what it actually means. Those tiny numbers can make a big difference in how, or even if, something gets recycled.
Most plastic containers have a chasing-arrows triangle with a number in the center, called a Resin Identification Code. The number tells you what type of plastic the item is made from, and different plastics have different recycling rules, so it's worth knowing the difference.
1. PET or PETE (Polyethylene Terephthalate)
2. HDPE (High-Density Polyethylene)
Found in milk jugs, shampoo bottles, and cleaning supply containers. Also widely accepted, and one of the safest plastics, often recycled into new bottles, piping, and outdoor furniture.
3. PVC (Polyvinyl Chloride)
Found in plumbing pipes, vinyl flooring, and some food wraps. Rarely accepted, and can release harmful chemicals when processed, so it's worth looking for alternatives when possible.
4. LDPE (Low-Density Polyethylene)
Found in grocery bags, bread bags, and squeeze bottles. Accepted in some recycling programs but not all.
5. PP (Polypropylene)
Found in yogurt cups, straws, bottle caps, and takeout containers. Becoming more widely accepted, and often repurposed into storage bins, automotive parts, and furniture.
6. PS (Polystyrene)
Found in Styrofoam cups, egg cartons, and takeout clamshells. Rarely accepted curbside since it breaks into tiny pieces that are difficult to recycle and often end up polluting waterways.
7. Other (Mixed Plastics)
Found in baby bottles, electronics cases, and reusable water bottles. Recyclability varies widely, so it's worth checking local guidelines.
Why These Numbers Matter
Knowing these codes helps you recycle properly, since tossing the wrong plastics in a bin can contaminate an entire batch, make smarter purchases by choosing widely recyclable plastics, and protect your health, since some plastics like PVC and polystyrene can release harmful chemicals.
Practical Tips for Smarter Recycling
Check local rules since not every facility accepts every type of plastic, rinse containers before recycling to prevent contamination, and use store drop-offs for bags, wraps, and films when curbside programs don't take them.
By learning these codes, you become part of the solution, helping reduce landfill waste and support a healthier planet.
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