Zhengzhou Yinyue Chemical Co., Ltd

For over two decades the name Topas has stood for high-quality products and innovative efforts in the field of particle and aerosol technology – developed, designed and made in Germany.

Since 1953 we produce highly porous sintered materials at our site in Dortmund. Our many years of varied experience in the processing of PE (SIPERM® HP), Stainless Steel (SIPERM® R) and Bronze (SIPERM® B) to highly porous plates, pipes, molded parts