Alternative / Replacement of DC 704
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 Hydrocarbon Diffusion Pump Oil(SV-DELTA), Apiezon C and Convoil 20. Silicone Diffusion Pump Oils on the other hand are made by controlled hydrolysis of Silanes, addition of Phenyl groups followed by Distillation. Famous Silicone Diffusion Pump oil brands are Supervac Ultra high Vacuum Silicone Diffusion Pump Oil (SV Sigma) and DC704.
Table below gives the comparison of both these oils, this will help user decide which particular oil is better for a particular application.
| Property | Hydrocarbon Diffusion Pump Oil | Silicone Diffusion Pump Oil |
| Ultimate Vacuum | 1x 10 -6 Torr | 1x 10 -8 Torr |
| Working Life | 3-6 months | 12 -18 months |
| Cost | Low | High |
| Pump Maintenance | Requires cleaning of Jets of Diffusion Pump every time oil is changed | No jet cleaning required |
| Vacuum Time | Fast | Very fast |
 
SV-DELTA
As it is clear from above that Hydrocarbon Diffusion Pump Oil is suitable in following conditions————
1)Â Â Â Cost of operation has to be kept very low.
2)Â Â Â Operation contaminates oil quickly.
3)Â Â Â Equipment is very old therefore working life of oil and vacuum level will remain low irrespective of oil used.
For all other applications Silicone Diffusion Pump oil is suitable. Supervac Industries manufactured Silicone Diffusion Pump oil SV-Sigma is one of the best Silicone Diffusion Pump oils available in the world.
About the author
Anshuman Punj is a post-graduate mechanical engineer and an MBA by qualification. (B.Tech.-Mechanical Engineering, M.Tech.-Tool Design, MBA-specialization in Materials Management). He has worked at various management positions in the private sector as well as a consultant, Design for Tooling. (Eicher Goodearth, Modi Xerox and Hero Motors). This was followed by an illustrious career in the Indian Railways as a Class 1 officer. Coming across the upcoming and challenging field of vacuum deposition, Anshuman quit the government service in order to develop several ground breaking vacuum products that could be manufactured in-country. Today, he is the CEO of Supervac Industries, a highly successful Indian company that manufactures and supplies vacuum consumables to a large number of customers around the world. Anshuman Punj heads Supervac Industries which is known world-wide for its high quality and reasonably priced products. With 17 years of experience in the Vacuum Industry, he regularly writes articles and blogs on Vacuum products and applications.
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