We classified polymers into 5 categories. 

Coronary stents are made of networked polymer.

polymers has the characteristics of versatility

Plastic is made from polymers.

Polymer is a kind of plastic and has the ability to stretch.

Polymer is unaffected by light and temperature. 

Some types of polymer can be decomposed in the soil and do not pollute the environment.

Polymer products are commonly used in medical applications.

some types of polymer can be recycled and reused many times.

Polymers can only exist in solid form

When overstretched, the polymer can break.

Polymers are used to make products from saucers to airplanes.

Most polymers are naturally occurring substances found in nature.

Polymers are made up of repeating units called monomers. 

When exposed to high temperatures, polymers will always melt.