Chongqing Tongsheng Electrical & Mechanical Research Institute is a hi-and-new-tech enterprise professionally engaged in researching, designing and making oil filter. It is the co-operative unit for criteria making on State Operative Oil Standard with the certificate of BS EN ISO 9001:2000. It is the only one unit to obtain the production permit certificate for making Explosion-proof Oil Filter in China. And it enjoys the only one recognized certificate of Advanced-Level Enterprise in this Profession issued by the State Bureau of Technical Supervision.

This Company has been engaged in the research, manufacture and development of equipment of oil purification for many years. It absorbs advanced technologies from home and abroad extensively. It has the vacuum purifying oil technology that is much advanced than that of any other similar enterprise in this profession in China. The company has obtained technology patent granted by the State and the products of this technology have been exported to some other countries in the world. All types of equipment are manufactured in accordance with the Standards of JB/T5285-91 of the previous Ministry of Machine-Building Industry, Standards of DL/T521-93 of the previous Ministry of Power Industry and of the Enterprise Standards of the People's Republic of China. Our products have covered all over of China and have been sold far to the countries of the south-east Asia.

There are 256 engineering and technical staffs in this Company. 51 of them have the senior or mediate relevant professional qualifications. The fixed property is 80 million RMB Yuan. This Company covers an area of 25.5 thousand square meters. The workshops are standardized with beautiful garden-like environment. The production and management are modernized. It owns the advanced quality checking measures. Therefore, it is the leading enterprise of the same trade in China. It is honored as Respecting Contract and Keeping Honesty Enterprise in China.