Chongqing Yuhan Technology Co., Ltd. is located in the beautiful mountain city of Chongqing. It is a company mainly engaged in chemical customization and trade. The company mainly deals in chemicals, chemical raw materials, pharmaceutical intermediates, labor protection products, spices, fine chemicals, raw materials, etc. There are more than 5000 categories of chemical raw materials. The company has always been reputation first, customers first, quality first, service first. Based on the best q...