Polyurethane (PUR), developed in 1937 by Otto Bayer, is used in insulation and mattresses and represents four percent of the world's plastic. It is mainly used in refrigerator insulation ...

Learn more about the tiny particles that can come off of your gum — what is essentially a soft piece of plastic — as you chew ...

“Our initial hypothesis was that the synthetic gums would have a lot more microplastics because the base is a type of plastic ...