CHAPTER 1 SOLDERING GENERAL

There are a variety of printed wiring boards, including printed wiring boards made of paper phenol and glass epoxy materials, as well as printed wiring boards made of flexible and ceramic materials (alumina). When selecting the material of the board, factors such as the thermal expansion coefficient of the mounting parts, electrical characteristics, mechanical characteristics, heat dissipation characteristics, reliability, and cost must be taken into consideration.

The materials used for the board generally differ depending on the application as follows.
Glass epoxy printed wiring boards are used for applications such as industrial electronic equipment (calculators, switching systems, OA equipment, wire and wireless communication devices, electronics systems, electric measuring instruments). Paper phenol printed wiring boards are mainly used for applications such as consumer devices (televisions, radios, tape recorders).
Glass epoxy printed wiring boards are generally used in applications that require excellent electrical isolation characteristics, moisture resistance, and dimensional stability.