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Diffusion Pumps come in all sizes and capable of producing high-vacuum and/or ultra high vacuum (UHV). A typical diffusion pump has a very simple working principle, and is classed as a first generation industrial pump. In this article, we will outline the advantages of a diffusion pump in comparison to other industrial pumps.


A diffusion pump operates a lot like a turbomolecular pump, meaning it is connected to a section, or a chamber that produces a high vacuum. Due to the momentum of the vacuum, the chemicals and molecules are able to enter the chamber, where it is transported by a stream of oil vapor. In the case of a turbomolecular pump, the oil vapor is replaced by layers of fast-spinning blades. Main advantages of a diffusion pump is that it operates using silicone-based diffusion pump oil (ECO-702, 704, or 705), and has not a single moving part. With no moving parts, and only the chamber of boiling oil that creates the vacuum, diffusion pumps are easy to maintain and the risk of breaking will be on a minimum. Another major advantage is the fact that diffusion pump oils are very accessible and affordable. Most industries still use the diffusion pumps due to the low costs of running it, compared to a turbomolecular pump.

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Although diffusion pumps have been around for so long, many industries still use it as their first choice of vacuum pump. The advantages of a diffusion pump clearly speak for itself, as a turbomolecular pump is often considered too expensive for an average manufacturer, and a regular mechanical pump is too weak. So by using a diffusion pump and keeping the technology simple and yet efficient, it is predicated that diffusion pumps will still be used for years to come.