It does not belong to it. Only when it forms part of the building structure can it be said to be a building material.

The building materials industry is an important materials industry in China. Building materials products include three categories: building materials and products, non-metallic minerals and products, and inorganic non-metallic new materials. They are widely used in construction, military industry, environmental protection, high-tech industries and people's lives.

Building materials are various materials used in construction projects. There are many types of building materials, which are divided into:

1. Inorganic materials, which include metallic materials (including ferrous metal materials and non-ferrous metal materials) and non-metallic materials (such as natural stone, burnt earth products, cement, concrete and silicate products, etc.).

2. Organic materials, which include plant materials, synthetic polymer materials (including plastics, coatings, adhesives) and asphalt materials.

3. Composite materials, which include asphalt concrete, polymer concrete, etc., are generally composed of inorganic non-metallic materials and organic materials.

Extended information

The key points for purchasing wires and cables are as follows:

1. Look at the packaging. National standard wires are often better made and neater. It feels like quality when held in hand.

2. Open the package and take a look at the wires inside. The national standard wires of 1.5--6 square meters require a skin thickness (insulation thickness) of 0.7mm. If it is too thick, it is non-standard. Correspondingly The inner core is definitely not enough. You can pull the thread with force. If it is not easy to tear, it is usually the national standard.

3. Burn it with fire and extinguish it within 5 seconds after leaving. Those with certain flame retardant functions are national standards.

4. Look at the inner core. The higher the brightness of the inner core material (copper), the better the copper quality. The brightness is uniform, shiny and has no layering. National standards require that the inner core must be made of oxygen-free copper. Non-standard products such as black rod copper may pose accident risks.

5. Countries have certain requirements for the thickness of the inner core, but they are not very strict. But it won't be a lot wrong, just a very small error that can't be seen with the naked eye.

6. For length, the country does not force the rice to be beaten, but many manufacturers also beat the rice. The rice that is beaten does not necessarily meet the national standard, but the general national standard generally does not beat the rice. Non-standard rice is just a means.

7. The state stipulates that the wire must be marked with a certain mark. The maximum length shall not exceed 500mm, and the same mark will be printed on it. It usually contains the product's trademark, manufacturer name, implementation standards, etc.

Baidu Encyclopedia--Wires and Cables