RoHS compliance for circuit boards means that the base material and the surface finish are free of lead. The restrictions are on each homogeneous material in the product; so total of each single substance must meet the standard or the entire product would fail the requirements of the directive.
One importance of the RoHS directive is to reduce the waste, which is hazardous by nature to man and earth, in consumer electronics. Since new technology is being increasingly sought after, the older technology and the products that use it is being discarded at the same rate if not quicker. The waste ends up in landfills or in other countries but in full circle, it negatively impacts us and the planet.
RoHS aids in reducing the damage brought by the discarding of products; to people and to the environment. The directive positively effects manufacturing, assembly and handling of products and prototypes that would have had hazardous impacts on the workers, which at times are children. Contact with solder paste post-RoHS is no longer as detrimental to one’s health.
10 restricted substances:
Lead (Pb): < 1000 ppm
Mercury (Hg): < 100 ppm
Cadmium (Cd): < 100 ppm
Hexavalent Chromium: (Cr VI) < 1000 ppm
Polybrominated Biphenyls (PBB): < 1000 ppm
Polybrominated Diphenyl Ethers (PBDE): < 1000 ppm
Bis(2-Ethylhexyl) phthalate (DEHP): < 1000 ppm
Benzyl butyl phthalate (BBP): < 1000 ppm
Dibutyl phthalate (DBP): < 1000 ppm
Diisobutyl phthalate (DIBP): < 1000 ppm