ALONG SEVEN(HONG KONG)CO., LTD. is a leading manufacturer in chemical industrial field, engaged in producing and selling chemical raw materials. Such as Ammonium persulfate, Potassium persulfate, Sodium Persulfate, Calcium Chloride, Ammonium Chloride, Soda Ash Light, Caustic Soda, Sodium Oxide. Etc. With advanced management and persist development, our market has covered three-quartered of countries in the world.