HENGDA INTERNATIONAL METAL CO.,LIMITED established on July 28th, 2005, the main production: 99.999% mercury. Products through the ISO9001 international quality system certification and ISO14001 international environmental certification. The company will be as in the past to adhere to the" strong science and technology enterprises, integrity enterprises " development ideas, and constantly open up domestic and international markets, the establishment of a new enterprise development strategy, based...