New Edwards Ultragrade 20 Vacuum Pump Oil 4 Litre Overview Edwards offers a range of new oils, Ultragrade 15, 19, 20 and 70, which result from a new process. Most manufacturers use a solvent refining process, whereas these oils are produced by a unique hydrotreating process. This process eliminates nitrogen, sulfur and oxygen and the aromatic hydrocarbons, leaving a clear base stock essentially free of impurities. Features and Benefits When combined with additives, the Ultragrade oils give improved vacuum performance, thermal and oxidation stability and rust inhibition. The anti-oxidants included in the oils enable the pump to withstand high operating temperatures without oil degradation, so extending intervals between oil changes. The properties of the oils allow them to be used in a wide range of applications. New Ultragrade 20 oils are the best choice for large pumps used in heavy-duty, cycling applications Technical Data Ultragrade 20 Vapor pressure mbar: 20ºC 1 x 10-7 100ºC 3.0 x 10-3 Molecular weight 500 Specific gravity at 15ºC 0.86 Viscosity cSt: at 20ºC 352 at 40ºC 103 Pour point ºC -12 Flash point ºC 260 Auto ignition point ºC 365 Sulphur content % mass/mass 0
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