Low Density: The low density of plastic is significant for reducing the weight of machinery and equipment and for energy conservation, particularly in vehicles, ships, airplanes, and spacecraft.

2. Higher Strength-to-Weight and Stiffness-to-Weight Ratios: While plastic is not as strong as metal, its lower density results in high strength-to-weight (σb/ρ) and stiffness-to-weight (E/ρ) ratios. Particularly, reinforced plastics made with various high-strength fibers, sheets, and powders of metals or non-metals exhibit even higher strength-to-weight and stiffness-to-weight ratios than metals.

3. Excellent Chemical Stability: The majority of plastics exhibit good resistance to acids, bases, salts, water, and gases, and do not undergo chemical reactions with these substances under normal conditions.

4. Excellent electrical insulation, thermal insulation, and noise reduction properties.

5. High wear resistance and self-lubricating properties: With a low coefficient of friction, excellent wear resistance, and good self-lubricating characteristics, the plastic, due to its high strength-to-weight ratio, operates with minimal noise transmission. It can effectively work in liquid mediums, semi-dry, and even dry friction conditions. It can be manufactured into machine parts such as bearings, gears, cams, and pulleys, and is particularly suitable for applications with moderate speeds and light loads.

6. Strong bonding capability.

7. Excellent molding and coloring properties.