Plastic hollow bar tubing is commonly used for machining pieces for specific applications, and to transfer liquids, non-pressurized air, or solids in the laboratory, chemical, pharmaceutical, electrical, and biotechnology industries. For example, bolts might be transferred through a length of square hollow bar tubing, and then deposited into a bag for an end use. Plastic hollow bar tubing is rigid, has a hollow center, and can come in a variety of shapes such as square, rectangular, or round.

Because plastic hollow bar tubing is used for machine parts for a specific application, the outer diameter (OD) can be as much as 0.040 (forty-thousandths)” larger than its published size, and the inner diameter (ID) can be as much as 0.040” smaller than its published size.

Fiberglass or polyvinyl chloride (PVC) are commonly used to make plastic hollow bar tubing. These materials offer strength, and have various optical, weight, and insulating properties, and chemical, solvent, electrical, heat, and environmental resistances. Fiberglass plastic tubing is commonly used in applications that are transparent to electromagnetic or radio frequency interference (EMI/RFI), and in light structural applications. PVC is corrosion-resistant, and is commonly used in plants handling various chemicals.