What is a rigid PCB?-深圳市海博精密电路有限公司

Rigid PCB is a printed circuit board made of solid substrate material, which once manufactured, cannot bend or deform, and cannot be changed. Rigid printed circuit board is a traditional type of PCB widely used in automotive, commercial, and industrial fields. The most famous and best-selling type of rigid PCB substrate or laminate on the market is FR4, which is a flame-retardant epoxy woven glass fiber. FR4 has advantages such as high hardness, good dielectric properties, and good thermal performance. The choice of rigid PCB laminate material depends on the expected application. Some applications may require specific materials with low thermal expansion coefficients or different dielectric constants.

A rigid PCB board can be divided into three main layers: insulation substrate, copper film, and photoresist layer. The insulating substrate is the FR4 mentioned earlier. The copper layer is etched to form a conductive path and realize the conductive part of the circuit. The thicker the copper layer, the better the current carrying capacity. The photoresist layer is a protective material that covers the copper layer. Rigid printed circuit boards can also be classified based on the number of layers: single-sided, bidirectional, and multi-layer rigid printed circuit boards have more layers, higher functionality, and more complex manufacturing processes.

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