Congratulations on the new official website of Zibo concentric material officially revised on-line! Welcome new and old customers to visit! Http://www.tongxin.com Zibo Tongxin material limited company is located in Shandong city of Zibo Province, Zhangdian high tech Development Zone, the company was founded in 2004, the factory is located in China, the factory has quality, strong technical force and advanced production equipment and testing means complete guarantee system. The main production and operation of activated alumina, molecular sieve, alumina ceramic ball, alumina filler ball, industrial grade alumina