Product Poly Aluminum Chloride CAS 31327-41-9 EINECS NO. 215-477-2 MF AlCl3 Appearance Red or yellow or brown powder Production Process of Poly Aluminum Chloride 1.Drum drying type: Alum purity around 28%, water insoluble content high,most used in waste water treatment and 2.Spray drying type 1) golden yellow color: Alum purity can reach to 29%-31%, water insoluble content low, dissolved fast, used in drinking water treatment 2) white color powder: Alum purity can reach to 29%-31%, water insoluble content low, dissolved fast, used in drinking water treatment, also can be used in paper production to increase the paper's tension and whiteness