First, the price is cheap, not only the cost of raw materials, but also the processing cost. This is too obvious to say, and there are too many examples. Look at the plastic things around you, most of them have price factors

Second, the specific weight strength is high, that is, under the condition of obtaining the same strength, plastic can make the product lighter, such as a camera

Plastic and metal: Plastic is soft, easy to fold, and has good light transmittance. It is cheap and has low production cost. The source of raw materials is also wide.

Plastic and wood: Plastic is not easy to rot, has good flexibility, occupies a small area, has a wide range of applications, and can block rain.

Plastic and cloth: It is not easy to get dirty, easy to wash, and impermeable.

Plastic can be as strong as any metal through modification

The strength of plastic itself is not high, but through modification and enhancement, plastic can be effectively made to have high strength and high rigidity. At present, the strongest modified plastic is carbon fiber reinforced PPA material model H9235XCF, with a tensile strength of 382MPa and a bending strength of 520MPa, which is comparable to steel and exceeds aluminum and copper. It is the strongest plastic currently available, with a density of 1.35g/cm3, which is less than one-fifth of iron. It has excellent properties such as high strength, high rigidity, low density, and fatigue resistance, making products lightweight and reducing structural weight. It is mainly used in aerospace, automobiles, machinery, electronics, automation, sports equipment, medical care, food, etc.