Advanced environmental friendly materials for HDI applications

In reflection of increased environmental consciousness the world over, consideration toward the environment is becoming essential even in the case of electric/electronic equipment. In printed wiring board (PWB) materials brominated flame-retardants are used, and as a result there is concern that dioxin may be generated during combustion. We tackled the development of new flame-retarding method, and we have developed halogen-free FR-4 and resin coated copper foil. Meanwhile, a tendency is also seen to regulate lead within solder, causing progress in the development of lead-free solder. In this paper, we describe the effects of halogen-free materials on the lead-free solder process.