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Do you know how to classify PCB materials
2021-09-27
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Author:Frank

Do you know how to classify PCB materials
1. According to the rigidity and flexibility of the board, it is divided into two categories: rigid copper clad laminate and flexible copper clad laminate.
2. According to different reinforcement materials, it is divided into four categories: paper base, glass cloth base, composite base (CEM series, etc.) and special material base (ceramic, metal base, etc.).
 (1) Paper substrate
Phenolic paper substrate (commonly known as, cardboard, rubber sheet, V0 board, flame retardant board, red copper clad laminate, 94V0, TV board, color TV board, etc., is the most widely used, using phenolic resin as a binder, wood pulp fiber Paper is a reinforced insulation laminate material. Phenolic paper-based copper clad laminates can generally be punched, and have the advantages of low cost, low price, and low relative density. The market competition is also quite fierce, and there are many copper clad laminate manufacturers in China. This type of board is produced. But its working temperature is lower, and its humidity resistance and heat resistance are slightly lower than that of epoxy glass fiber cloth substrate. The paper substrate is mainly single-sided copper clad laminate, but in recent years, it has also been used for For double-sided copper clad laminates with silver paste through holes, major international companies also produce double-sided copper clad laminates, such as Doosan (DS character). Its resistance to silver ion migration is higher than that of general phenolic paper-based copper clad laminates. Phenolic paper-based The most commonly used product models for copper clad laminates are FR-1 (flame retardant) and XPC (non-flame retardant). Single-sided copper clad laminates can be easily judged from the color of the characters on the back of the board. Generally, the red letter is FR-1 (flame retardant). Type), the blue word is XPC (non-flame retardant). This type of sheet is the cheapest compared to other types.

pcb board

(2) Epoxy glass fiber cloth substrate

Epoxy fiberglass cloth substrate (commonly known as epoxy board, fiberglass board, fiberboard, FR4), epoxy fiberglass cloth substrate is a type of epoxy resin as the adhesive, and electronic grade glass fiber cloth as the reinforcing material Substrate. Its bonding sheet and inner core thin copper clad laminate are important substrates for making multilayer printed circuit boards. The operating temperature is high, and its performance is less affected by the environment. In terms of processing technology, it has great advantages over other resin glass fiber cloth substrates. This type of product is mainly used for double-sided PCBs, and is also about twice as expensive as phenolic paper substrates. The usual thickness is 1.5MM.

(3) Composite substrate (CEM)

Composite substrate (commonly known as pcb powder board, etc., cem-1 board is also called 22F in some places in China) It mainly refers to CEM-1 and CEM-3 composite base copper clad laminate. Wood pulp fiber paper or cotton pulp fiber paper is used as the core reinforcement material, and glass fiber cloth is used as the surface reinforcement material. Both are impregnated with flame-retardant epoxy resin and made of copper clad laminate, called CEM-1. The glass fiber paper is used as the core reinforcement material, the glass fiber cloth is used as the surface reinforcement material, and the copper clad laminates are all impregnated with flame-retardant epoxy resin, called CEM-3. These two types of copper clad laminates are currently the most common composite base copper clad laminates. This type of sheet is cheaper than FR4 type sheet.