What is the material of the circuit board?

Manufacturing materials and characteristics of circuit boards

Circuit board is an indispensable component in electronic industry, and plays a key role in the design and production of electronic products. So, what is the main material of the circuit board?

The main materials of the circuit board are glass fiber, plastic, copper and solder mask. Among them, the most commonly used are glass fiber and copper. Glass fiber is the basic material of circuit board, which is composed of superfine glass fiber and epoxy resin. This material has high strength, high temperature resistance, high electrical insulation and excellent chemical stability. Therefore, glass fiber is widely used in single-layer, double-layer and multi-layer printed circuit boards.

Copper is the conductive layer material of the circuit board, which is used to connect electronic components and various parts of the circuit board. Copper's good electrical conductivity and mechanical strength make it one of the most commonly used conductive materials. According to the requirements of the circuit board, copper can be covered by electrolytic deposition, printing and chemical stripping.

In addition to glass fiber and copper, plastic is also an important material for circuit boards. The development demand of electronic products is getting thinner and thinner, and plastic has become a very common substrate material in printed circuit boards because of its light strength, good insulation and good processability.

Finally, solder resist is also an important material in the circuit board. Its main function is to protect the circuit board from burning or corrosion and enhance the durability of the circuit board. There are many kinds of solder resist, and the common ones are organic solvents and inorganic dispersions. However, with the popularization of lead-free technology and the improvement of environmental awareness, lead-free solder resist has gradually become the development trend of printed circuit boards in recent years.

Generally speaking, printed circuit boards are made of various materials, which require not only good electrical conductivity, insulation, processability and mechanical properties, but also compatibility and environmental protection between materials, so there are still many directions and challenges for the development of circuit board materials.