Qingjiang yi and changgang limited, the company's main company, is a brown-coloured mother, dyed particles, all raw materials are sent annually to sgs for testing, and the products meet the environmental standards of the eu such as rohs, reach, en71-3, ul fire protection standards in the united states, and safety requirements for medical devices such as fda food containers and biocompatibility. The company is certified through iso 9001. Customised for medical grade colour powder or mother particles as required。