Spectroscopic and Thermal Analysis of Halogen-free Printed Circuit Boards

摘要

Results of an investigation of halogen-free and conventional PCB boards, comparing various base materials of FR-4 grade and halogen-free grades from different material suppliers. Electronic equipment manufacturers have started focusing on "environmentally friendly" products. Many arguments were discussed regarding potential leaching out of lead from disposed electronic equipment. Waste treatment, such as incineration of organic material, directed additional attention to halogens contained in many electronic appliances as flame retardants. Gas phase mechanism of halogens, and it is mainly bromine, was historically one of most efficient ways to improve flame retarding properties of polymers. However, as some halogenated compounds tend to promote the formation of carcinogens as polychlorinated dibenzodioxines, PCDD, and polychlorinated dibenzofuranes, PCDF, and their derivatives, halogens are increasingly banned from all sorts of goods. Parallel to the voluntary action of electronic manufacturers, there exists legislation to ban both lead from solder and interconnects and halogens from polymer materials. Currently, the European law makers are discussing limiting the maximum contents in electronic products for lead and for halogen products, effective from 2006-2007.