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使用油扩散泵获得超高真空，扩散泵油的蒸汽压、稳定性以及纯度是影响极限真空的主要因素。我们曾经对三种低蒸汽压硅油样品进行性能比较。编号ＤＣ—７０５（１），ＤＣ—７０５（２），它们为本所合成样品． ＹＧ ２７５为上海树脂厂产品。以及三个本所合成的副产物平４、平５及特６。通过测量极限真空、确定质量以及在操作上使用这种低蒸声压硅油应注意事项、防止污染、进一步提高真空度方法等给以报导，以供生产及使用各方面参考。
The use of oil diffusion pump to obtain ultra-high vacuum, diffusion pump oil vapor pressure, stability and purity are the main factors that affect the ultimate vacuum. We have compared the performance of three samples of low vapor pressure silicone oil. No. DC-705 (1), DC-705 (2), which are our synthetic samples. YG 275 Shanghai resin plant products. And three by-products of the synthesis of flat 4, flat 5 and special 6. By measuring the ultimate vacuum, to determine the quality and operation of the use of this low-pressure sound silicone oil cautions, to prevent contamination, to further improve the vacuum method to be reported for production and use of various aspects of reference.