Which Plastics Are Recyclable by Number? | The Old Farmer's Almanac

Which Plastics Are Recyclable By Number?

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Plastics Recycling Chart

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What do those number symbols on plastic really mean? Interestingly, those little numbers inside the triangles were not created for recycling! Here’s a Plastics Identification Chart to help make your recycling a little easier.

The number symbols that you see inside triangles on plastic bottles and containers were started by the Society of Plastics Industry (SPI) to simply identify the plastic resin content, not to identify for recycling. (Maybe that’s why they are so hard to see!)

It gets complicated because every local recycling facility collects different types of plastics and you need to contact your recycle to know which plastics get collected. Bottom-line, there are seven types of plastics. Generally, most recyclers accept plastics #1 and #2. Plastics #3 to #6 are more difficult to recycle and some recycling centers do not process them. Plastic #7 is even more difficult to recycle and almost always excluded.

Plastics Identification and Recycling Chart

Here are the seven standard classifications for plastics, and the recycling and reuse information for each type. See more information below this chart.


Did your eyes glaze over with that chart? To help, here is more information about the different types of plastics to better understand which ones are safe and which ones may leak chemicals into your food and body.

#1: PET (Polyethylene Terephthalate)

Water bottles and plastic soda bottles are the most common containers made out of PET. It’s fine to recycle.

However, avoid reusing plastic containers made of PET. Why? PET is meant for single-use applications; repeated use increases the risk of leaching and bacterial growth. Plus, it’s very difficult to clean or remove harmful chemicals. PET may leach carcinogens.

#2: HDPE (High-Density Polyethylene)

Most milk jugs, detergent containers, and oil bottles are made from HDPE. It’s a very common plastic and one of the safest to use. It’s also fully recyclable.

#3: PVC (Polyvinyl Chloride)

PVC is used for a lot of plastic food wrapping because it’s soft and flexible. Most consumer recyclers will not take PVC products. Also, avoid reusing PVC products, especially when it comes to food or for children’s use. They contain toxins which leach throughout its entire life cycle.

#4: LDPE (Low-Density Polyethylene)

LDPE is usually what plastic bags are made from. You’ll also find LDPE in shrink wraps, dry cleaner garment bags, and other items.

Though most plastic bags are not recyclable, some companies and recycling centers have found alternatives or are investigating how to recycle plastic bags given their harmfulness to the environment.

LDPE is reusable and safe to repurpose.

#5: PP (Polypropylene)

Polypropylene plastic is used in those margarine and yogurt containers, potato chip bags, cereal bags, and much more. 

Polypropylene is recyclable, although many recyclers still don’t accept it. PP is considered safe for reuse.

#6: PS (Polystyrene)

Avoid polystyrene as best as possible. It’s used for disposable styrofoam drinking cups, take-out containers, packing peanuts, and more.

Polystyrene is not generally recyclable and accounts for about 35% of US landfill material. Because it breaks apart so easily, it’s often found inside marine animals’ stomachs and littering our beaches.

Avoid reusing polystyrene. Chemicals present in polystyrene have been linked with human health and reproductive system dysfunction. Polystyrene may leach styrene, a possible human carcinogen, into food products (especially when heated in a microwave).

#7: Polycarbonate, BPA, and Other Plastics

Assume that nothing with the #7 number can be recycled or reused. BPA can leak chemicals. It’s an xenoestrogen, a known endocrine disruptor.

We hope this article has been helpful in introducing the different types of plastics. It’s certainly a little more complicated than it needs to be!

Consider this last question: A kid buys a plastic beverage bottle. It’s tossed in the trash and buried in a landfill where it will take over 400 years to decompose. However, if that beverage bottle is recycled, it can be transformed back into the same plastic pellets used to make it in the first place. Yes, it still takes some energy to recycle, but this bottle’s life is not over and it is part of a “cycle” in which natural resources do not go to waste. Before you toss something in the trash, be sure to ask yourself: “Is this really garbage?”

Interested in using less plastic? Learn ways to garden with less plastic.

2023 Almanac Club