Plastics can be divided into two types, thermoset polymers and thermoplastics. Its main feature is that the thermosetting polymer can only be melted and molded for one time, and will become solid after cooling. While Thermoplastics can be melted and molded for many times, which means they can be recycled continuously.

Plastic containers contain many chemicals, some of which have been identified as potentially hazardous. High density polyethylene, which is also known as HDPE, is a tougher and more durable plastic than many other polymers. This durable plastic is used in a variety of applications.

There are two types of plastics, thermoplastic and thermoset polymers. Thermoset polymers can only be melted and molded once and remain solid once cooled. Thermoplastics can be repeatedly melted and shaped to be recycled. Both PVC and HDPE are thermoplastics that have much in common.

The raw material for the HDPE tube is thermoplastic HDPE (high density polyethylene). HDPE was created in the 1930s and used in high frequency radar cables during the Second World War. It was quickly brought to market. The HDPE pipe is a flexible plastic tube for fluid and gas delivery that is commonly used to replace aged concrete or steel tube.