Which plastic is number 5?

What Is Plastic Number 5? The Truth About Polypropylene

Ever flipped over a plastic container and seen a tiny "5" inside the recycling symbol? That number refers to the type of plastic used — and in this case, it's polypropylene, commonly abbreviated as PP.

Polypropylene is a sturdy, versatile plastic known for its resistance to heat and impact. You’ll often find it in items like yogurt cups, microwave-safe containers, bottle caps, and even some reusable food storage containers. Because it can handle higher temperatures, it's a go-to for products that might face heat exposure — think hot-filled foods or dishwasher use.

While polypropylene is technically recyclable, it's not as widely accepted as plastics number 1 (PETE) or 2 (HDPE). Many curbside recycling programs do not include number 5 plastics, so they often end up in landfills. However, some specialized recycling centers and drop-off locations do accept PP, and certain brands now offer take-back programs to keep it out of the waste stream.

Thanks to its durability and flexibility, polypropylene plays a big role in packaging and household goods. But its recycling challenges mean consumers should be more mindful. The best approach? Reuse number 5 containers when possible and check local guidelines before tossing them in the bin.

So next time you spot that little 5, remember — it’s polypropylene: tough, heat-resistant, and recyclable, just not always convenient to recycle. A bit of extra effort can make a difference.