Shandong Huijin Chemical Co., Ltd. is a chemical researching, developing and manufacturing enterprise. Chongqing Cooper Science And Technology Co.,ltd. is a one of the leading manufacturers of Dimer acid, Polyamide resin, Hot-melt adhesive, Reactive polyamide resin and Monomer acid in China. As an ISO9001:2000 quality system approved and I/E licensed company, we now produce and export our high quality products to our customers all over the world.