Guangzhou Tianhe District Guangdong Salt Industries PVC Materials Qi Ti Chu Yun Tian Ran Shu Grease Sodium Chloride Chemicals Engineering He Cheng Shu Grease Lv Hua Na Lin Suan Qing Er An Lian Er Ya Sulfur Sodium Chemicals Materials Chemistry Compositing Salt Chemicals常务理事单位理事单位副理事长单位