... have several different kinds and can be 4:1:4, 4:1:5, 4:1:6, 4:1:7, 3:1:3 and ... ship and boiler manufacture. And it also can be used to manufacture high-grade glass articles, magnesium salt ... and chemicals for daily use, etc. It can be used as anti-acid agent in pharmaceutical industry. And ... also can be used as desiccant, color retention agent, carrier and ...