... noise, corrision resistance 3.invironmetal protection Aipu Environmental Protection Technology Co., Ltd is located in the Yangtze River Delt, the the largest ... are spreading to Beijing, Shanxi, Shandong, Jilin, Liaoning, Heilongjiang, Henan,hebei, Hunan, Hubei, Guangdong, Guangxi, Sichuan and even border areas Xinjiang ...