Much of the U.S. uses single-stream recycling, where plastic, glass and paper go into one bin. Here’s what happens to that material and ways engineering is trying to improve the process ...

Prices for post-industrial polypropylene have slightly decreased during the first weeks of the second quarter of 2025.

The scientists running the experiment estimated that over 79.4 million polypropylene ... avoiding plastic cutting boards is easy, finding the right material is not simple. Every type of cutting ...

In the past, we did use a small amount of polypropylene (the most common type of plastic) as the seal to keep our signature pyramid teabags’ structure intact. Our tea boffins have been busy ...