NO.3 seven star diffusion pump oil is a deep dewaxing of lubricating oil, vacuum distillation, adsorption and aluminum processing film from degassing processes. This product has very low vapor pressure and suitable chemical composition; has the ideal limit of vacuum and high pumping speed; has a very high thermal oxidation stability, a long time in a relatively poor working conditions. 

Chengdu Yu Vacuum Electronic Materials Co., Ltd.  founded in 2001, and was formerly known as vacuum plating products supplier in China. Our company is specialized in manufacturing of vacuum coating or chrome plating materials. We always keep the principle that "Customers are the enterprise‘s life; Commitment to pursuing excellent quality in tungsten products". The "Yu Shi" brand products are well-know in Southwest region where is the main tungsten reserve and produce area in China, and have been praised as "Sichuan Province Famous Products" in the tungsten line, and have sold well in the domestic and international markets.