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As well as a lubricant, vacuum grease is also used as a sealant for joints in vacuum systems. This is usually limited to soft vacuums, as ultra high vacuum or high temperatures may give problems with the grease outgassing. Grease is most commonly used with glass vacuum systems. [1] All metal systems usually use knife-edge seals in soft metals ...
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The grease helps to prevent joints from "freezing", as well as ensuring high vacuum systems are properly sealed. Apiezon or similar hydrocarbon based greases are the cheapest, and most suitable for high vacuum applications. However, they dissolve in many organic solvents.
Silicone grease, sometimes called dielectric grease, is a waterproof grease made by combining a silicone oil with a thickener. Most commonly, the silicone oil is polydimethylsiloxane (PDMS) and the thickener is amorphous fumed silica. Using this formulation, silicone grease is a translucent white viscous paste, with exact properties dependent ...
Austenitic stainless steels are the most common choice for high vacuum and ultra-high vacuum systems. Not all alloys are suitable; e.g. the free-machining 303 steel contains sulfur, which tends to outgas. Alloys with good weldability under argon arc welding are usually chosen. 304 stainless steel is a common choice of a stainless steel.
Some products that may require laminar mixing in a high viscosity mixer include putties, chewing gum, and soaps. [1] The end product usually starts at several hundred thousand centipoise and can reach as high as several million centipoise. Typical mixers used for this purpose are of the Double Arm, Double Planetary or Planetary Disperser design.
Some collectors do their own rendering while others may sell their grease for a lower price to a company with the space and equipment to do so. Refined used cooking oil is what is left after separation of solids and moisture from yellow grease. Refined used cooking oil is the base for producing biodiesel and renewable diesel. [9]
This vacuum state is called high vacuum, and the study of fluid flows in this regime is called particle gas dynamics. The MFP of air at atmospheric pressure is very short, 70 nm , but at 100 mPa (≈ 10 −3 Torr ) the MFP of room temperature air is roughly 100 mm, which is on the order of everyday objects such as vacuum tubes .
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