-In 2009, halogen-free materials were extended to all sunmate products (bromine (BR) ≤ 900ppm, chlorine (CL) ≤ 900ppm, total concentration of chlorine (CL) + bromine (BR) ≤ 1500ppm in homogeneous materials. For all halogen-free products, Somerset provides relevant material composition table and third-party test report to prove the conformity of products.

-All the pins of sunmate product series are lead-free electroplating.

The RoHS (on the restriction of the use of certain hazardous substances in electrical and electronic equipment) was issued from the RoHS directive in July 2006; the Chinese ROHS directive "administrative measures for pollution control of electronic information products" was issued in March 2007; and the reach regulation "registration, evaluation, permission and restriction of chemicals" in June 2007 showed that the control of environmental load substances was increasingly strengthened. It is required that the electronic and electrical equipment put into the EU market shall not contain six harmful substances, such as lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE).