Shandong Helishi Zhongjie Chemical Co., Ltd.

Current our factory has applied the patent for heavy metal control in PMDA production (Patent No. is 201210398252-5). We can also customize goods acco

for polyimide film, polyimide resin and insulation materials. The annual output of ODA is 1000mt. It is a high value-added fine chemical product.

The product 4, 4'-Diaminodiphenyl ether, produced by using a self-developed hydrogenation reduction technology, is of high product purity and good

The product 4, 4'-Diaminodiphenyl ether, produced by using a self-developed hydrogenation reduction technology, is of high product purity and good

We are one of the largest manufacturers for Pyromellitic Dianhydride (PMDA). Well-equipped test and analysis measures guarantee the stable and reliabl