PCB Blog - Bare pcb fr4 material

PCB bare board refers to a printed circuit board that has not added any through holes or electronic components. They are often referred to as bare PCB boards, sometimes also known as PCBs. Blank PCB boards only have basic channels, patterns, metal coatings, and PCB substrates.

FR-4 is a code name for a fire-resistant material grade, which represents a material specification in which resin materials must be able to self-extinguish after combustion. It is not a material name, but a material grade. Therefore, there are currently many types of FR-4 grade materials used in general circuit boards, but most of them are composite materials made of so-called four functional epoxy resin with fillers and glass fibers.

FR-4 epoxy glass cloth laminates are commonly referred to in the industry as FR-4 epoxy glass cloth, insulation board, epoxy board, epoxy resin board, brominated epoxy resin board, FR-4, fiberglass board, fiberglass board, FR-4 reinforcement board, FPC reinforcement board, flexible circuit board reinforcement board, FR-4 epoxy resin board, flame-retardant insulation board, FR-4 laminated board, epoxy board, FR-4 optical board, FR-4 fiberglass board, epoxy glass cloth board Epoxy glass cloth laminate, circuit board drilling pad.

FR4 is made of epoxy resin and glass fiber. Due to its excellent electrical, mechanical, and thermal properties, it is the most widely used material in PCB manufacturing. Suitable for high-frequency and high-performance applications.

What is the use of bare PCB boards?

PCB bare board is the skeleton of traditional circuit boards. It guides current and current through appropriate paths and is used in most computing electronic devices.

The simplicity of blank PCBs provides engineers and designers with sufficient freedom to add components as needed. This blank board provides flexibility and is capable of mass production.

This type of PCB board requires more design work than other wiring methods, but can often be automated after assembly and manufacturing. This makes PCB boards the cheapest and most effective choice.

Bare boards are only useful after adding components. The ultimate goal of a bare PCB board is to become a complete circuit board, which can have multiple uses if matched with suitable components.

Classification of FR4

The surface colors of FR-4 epoxy glass cloth laminate are:

Yellow FR-4, white FR-4, black FR-4, blue FR-4, etc.

FR-4 is the substrate used for PCBs and is a category of sheet materials. Plate materials are mainly classified into the following four types according to their different reinforcing materials:

1) FR-4: Glass cloth substrate

2) FR-1, FR-2, etc.: Paper substrate

3) CEM series: composite substrate

4) The special material substrate (ceramic, metal base, etc.) FR-4 is a plate-like laminated product made by impregnating a specialized electronic cloth with materials such as epoxy phenolic resin and hot pressed at high temperature and high pressure.

Characteristic

FR-4 epoxy fiberglass cloth substrate is a type of substrate that uses epoxy resin as the adhesive and electronic-grade fiberglass cloth as the reinforcing material. Its adhesive sheet and thin copper-clad inner core are important substrates for producing multi-layer printed circuit boards.

Performance

The mechanical properties, dimensional stability, impact resistance, and moisture resistance of epoxy glass fiber cloth substrate are higher than those of paper substrate. It has excellent electrical performance and high operating temperature, and its performance is less affected by the environment. In terms of processing technology, it has great advantages over other resin-based fiberglass cloth boards. This type of product is mainly used for double-sided PCBs and requires a large amount of usage.

Application

The most widely used product model for epoxy fiberglass fabric substrate is FR-4. Due to the development of electronic product installation technology and PCB technology, FR-4 products with high Tg have emerged.

A bare PCB board is a template used in the production of printed circuit boards, which undergo chemical corrosion and other process steps to ultimately obtain a PCB circuit board.