Plastic caps are used for plastic bottles, while metal with plastic backing is used for glass; plastic caps are commonly made from polyethylene or polypropylene, while metal caps are usually either steel or aluminum. Plastic caps may have a pour spout.

And plastic bottle caps are made from a type of plastic called polypropylene. Plastic caps & closures are a safe and secure packaging solution commonly used for packing and sealing different types of bottles, tubes, containers and jars. These are the final components of the packaging process predominantly used in end industries such as food, beverage, pharmaceutical, cosmetics and personal care.