Production of DC 704 has been discontinued. It served vacuum industry well for about 20 years. But in last 20 years technology has taken a big leap. To increase productivity Vacuum pumps need to work faster, higher level of vacuum is required by industry. Above all because of increasing competition Industry wants cost effective products.…
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Before the advent of Silicone Diffusion Pump Oils about 20-25 years ago. Hydrocarbon Diffusion Pump Oils ruled the Vacuum Industry. These oils are prepared from base oil that has been distilled from crude oil and purified by Dewaxing and Solvent extraction. This is further purified by additional vacuum distillations. Famous hydrocarbon oils brands are Supervac…
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It is quite understandable that when a consumer is extremely satisfied with a product, he tends to ask for the same over and over again. In the vacuum world, DC-704 was the undisputed king of vacuum oils for a long time. Then, in 2012, Dow Corning, the American company manufacturing this oil; for reasons best…
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The entire process of vacuum deposition rests on the foundation of efficient working of Diffusion pump. Good quality Diffusion pumps are like work horses: they are capable of functioning effortlessly for long periods of time provided they are fed nicely and taken care of. For diffusion pumps, the fodder is diffusion pump oil. Diffusion pump…
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Diffusion Pump oil is of two types – Silicone and Hydrocarbon. Most people these days prefer silicone DP oil because of the following reasons. * Good quality silicone diffusion pump oil will have a high vapor point and therefore deliver a higher vacuum level. * Will be thermally stable. * Compared to Hydrocarbon oil, silicone DP oil…
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Q.1 How does a diffusion pump work? Ans. A diffusion pump works on the principle of gas diffusion to create vacuum. In a diffusion pump, diffusion pump oil is heated to its boiling temperature. Vapor of this oil is compressed in a vertically tapering hollow cone as it moves up. Simultaneously this oil vapor escapes…
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Q.11 How to prevent back streaming of diffusion pump oil? Ans. To prevent back streaming of Diffusion Pump oil it must be ensured that- System is “Roughed out” before Diffusion Pump is put in line. Rotary vacuum pump is maintaining a vacuum of at least 10-2 Torr. If process is causing release of a large…
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Q.21 What is the alternative of CVC4 diffusion pump oil. Ans. Supervac Industries, New Delhi manufactures silicone diffusion pump oil SV-SIGMA. This oil is a perfect alternative of CVC4. Infact, SV-SIGMA has a much larger satisfied customer base and has been in use much before CVC4 started getting promoted. Q.22 Can somebody supply me…
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A furnace is typically run at temperature between 500 o C- 1200 o C. Because of such elevated temperatures, furnaces require a lot of safety precautions in their normal operations. Because of requirement of better products many times it is essential that heating inside furnace be done under vacuum. Such a furnace is called a vacuum furnace. Advantages…
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A lot of confusion exists in the vacuum industry about certain things, for example- What should the optimum temperature be set in diffusion pump heaters so as to get maximum level of vacuum in shortest possible time? How can the temperature in diffusion pumps be set in such a way that the engineers…
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