STC Grop is one of professional not-for-profit Testing, Inspection and Certification organization that more than 50 years professional service history and experience (established in 1943),STC (Dongguan)Company Ltd is a Subsidiary of Hong Kong Standerds and Teating Center(STC) and is accredited by CNAS, CPSC, DakkS, BSI, Mattel, Hasbro, Spin Master, HOKLAS, JTA, JMHW and GSO ; not noly in Chemical tests but also in Physical test and EP, FEP and QN control