TENGZHOU AOLONGCHEMICAL CO.,LTD is a professional manufacturer of Calcim propionate , Sodium benzoate ,and Potassium sorbate since 1999, it is located in Economic Development Zone,Tengzhou, Shandong Province. and 5 miles from JIngtai Highway, Beijing to Shanghai High Speed Railway. It is 15 miles from Jinghang Canal Harbor. The transportation is convenient. In 2008, we established a subsidiary company in Hongkong, it named SUNWING INTERNATIONAL COMPANY LIMITED,which is charged in the development of international market and after-sale service.