They are all polymer materials, why are they in the classification of specific uses?

Polymer materials, also known as polymer materials, are based on polymer compounds and supplemented by other additives (additives).

Polymer materials are classified by source:

Polymer materials are divided into natural polymer materials and synthetic polymer materials according to their sources.

Polymer materials are classified according to the application:

Polymer materials are divided into rubber, fiber, plastic, polymer adhesive, polymer coating and polymer-based composite materials according to their characteristics.

Polymer materials are classified according to their application functions:

According to the functional classification of materials, polymer materials can be divided into general polymer materials, special polymer materials and functional polymer materials. General polymer materials refer to polymer materials that can be produced on a large scale and have been widely used in the main fields of national economy such as construction, transportation, agriculture, electrical and electronic industry and people's daily life. Among them, it is divided into plastic, rubber, fiber, adhesive, paint and other different types. Special polymer materials are mainly a kind of polymer materials with excellent mechanical strength and heat resistance, such as polycarbonate, polyimide and other materials, which have been widely used in engineering materials. Functional polymer materials refer to polymer compounds that have specific functions and can be used as functional materials, including functional separation membranes, conductive materials, medical polymer materials, liquid crystal polymer materials and so on.