English pitch timing pulleys are made of metal, plastic and combination materials. Factors such as environmental conditions, design horsepower, operating temperature, and cost determine the best ...

Super-torque is a metric, curvilinear pitch with sizes ranging from 2 to 14 mm. Metric pitch timing pulleys are made of metal, plastic and combination materials. Factors such as environmental ...

They were washed in with the tide, most likely from China or the US, thousands of miles away -- part of an enormous plastic garbage patch, spinning in the middle of the Pacific Ocean, which you ...

In little more than a century, plastic has gone from being hailed as a scientific wonder to being reviled as an environmental scourge. It was in 1907 that the first modern plastic, bakelite ...

Scientists have new evidence to explain why plastic is dangerous to sea turtles: the animals mistake the scent of plastic for food. Thus, a plastic bag floating in the sea not only looks like a ...

Plastic is incredibly useful and practical – and everywhere. Our modern life depends on it. Strong, light and adaptable, it’s in everything from household goods, medical equipment and bank notes, to ...

The case of Philip C. Pulley, a 62-year-old man from Huntington Valley, Pennsylvania, highlights the seriousness of such ...

There are also the plastic resin codes with numbers from one to seven indicating what type of plastic the item is made off ...

Plastic bags start out as fossil fuels and end up as deadly waste in landfills and the ocean. Birds often mistake shredded plastic bags for food, filling their stomachs with toxic debris. For hungry ...

This story is part of Planet or Plastic?—our multiyear effort to raise awareness about the global plastic waste crisis. Learn what you can do to reduce your own single-use plastics. Read this ...

Scientists have developed a "self-digesting plastic", which, they say, could help reduce pollution. Polyurethane is used in everything from phone cases to trainers, but is tricky to recycle and ...

Plastic is a really useful man-made material that has transformed our lives, but what happens after we throw it away is causing a big problem for our planet. Plastic waste can last for hundreds of ...