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MOLYKOTE a NEW lubricant

MOLYKOTE a NEW lubricant MOLYKOTE a NEW lubrican t A new lubricant has been evolved by the Alpha Corporation , Greenwich, Connecticut, which is claimed to have many valuable properties as a dry lubrican t and an anti-seizing compound. The com­ poun d consists of a smooth-textured molybdenum disulphide powder and is know n under the trade name of " Molykote". Whils t being similar to graphite in appearance, it does not contain any and is stated to prevent galling an d seizing a t bearing pressures of over 100,000 pounds per square inch and at either high or low sliding velocities. Those properties are probably due to its molecular structure. Each laminae of this compound is composed of a layer of molybdenum atoms with a layer of sulphur atoms on each side. One of these lamina e adheres strongly to th e metal surface because of a strong metal-to-sulphur bond and the other laminae slip easily because of the weakness of the sulphur-to-sulphu r bond. Useful Breaking-ln Lubricant. Molykot e is state d to have been very advantageous for all types of running-in surfaces. In some cases it is rubbed into the bearing surface during assembly an d conventional lubrication employed with Molykote actin g as an "undercoat". In other cases, the Molykote is mixed with a light oil into a paste and rubbe d or brushed into the surfaces. It has also been used for running-in gear teeth when mixed two part s by weight to one of grease. I t is recommended for treatment of threaded connections which have to be dismantled, and it will withstand up to 850°F. and still ensure only low torqu e being required for unscrewing. It is also though t to have valuable properties in connection wit h counteracting the effects of fretting corrosion. Properties. Molykote is attacke d by aqu a regia and boiling con­ centrate d hydrochloric acid and , in th e presence of pure oxygen, it oxidizes at room temperature. Fluorine and chlorine decompose it, but hydrogen fluoride does not. Since the sulphur is chemically combined, its action on some metals is not believed to be the same as that of free sulphur. At temperatures of over 750°F. the rate of oxidation assumes practical significance, but not below this temperature. Oxida­ tion produces metal oxides which have no lubricating properties , although they may have anti-seizing or anti-weldin g properties. In the absence of air, however, lubricating properties are maintained at temperature s in excess of 750°F. Th e specific gravity of Molykote is approximately five and it will not remain suspended in liquids unless agitated . It is non-magnetic and has a specific resistance of 0.409 at 198°F., of 0.790 at 67°F. and 8.33 at 85°F. The cost of a ten pound tin of Molykote costs twenty dollars in the U.S.A. and it is estimated that ten ounces will liberally cover 500 squar e feet of smooth metal with a tenacious coating. 16 Scientific LUBRICATION April, 1950 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

MOLYKOTE a NEW lubricant

Industrial Lubrication and Tribology , Volume 2 (4): 1 – Apr 1, 1950

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0036-8792
DOI
10.1108/eb052045
Publisher site
See Article on Publisher Site

Abstract

MOLYKOTE a NEW lubrican t A new lubricant has been evolved by the Alpha Corporation , Greenwich, Connecticut, which is claimed to have many valuable properties as a dry lubrican t and an anti-seizing compound. The com­ poun d consists of a smooth-textured molybdenum disulphide powder and is know n under the trade name of " Molykote". Whils t being similar to graphite in appearance, it does not contain any and is stated to prevent galling an d seizing a t bearing pressures of over 100,000 pounds per square inch and at either high or low sliding velocities. Those properties are probably due to its molecular structure. Each laminae of this compound is composed of a layer of molybdenum atoms with a layer of sulphur atoms on each side. One of these lamina e adheres strongly to th e metal surface because of a strong metal-to-sulphur bond and the other laminae slip easily because of the weakness of the sulphur-to-sulphu r bond. Useful Breaking-ln Lubricant. Molykot e is state d to have been very advantageous for all types of running-in surfaces. In some cases it is rubbed into the bearing surface during assembly an d conventional lubrication employed with Molykote actin g as an "undercoat". In other cases, the Molykote is mixed with a light oil into a paste and rubbe d or brushed into the surfaces. It has also been used for running-in gear teeth when mixed two part s by weight to one of grease. I t is recommended for treatment of threaded connections which have to be dismantled, and it will withstand up to 850°F. and still ensure only low torqu e being required for unscrewing. It is also though t to have valuable properties in connection wit h counteracting the effects of fretting corrosion. Properties. Molykote is attacke d by aqu a regia and boiling con­ centrate d hydrochloric acid and , in th e presence of pure oxygen, it oxidizes at room temperature. Fluorine and chlorine decompose it, but hydrogen fluoride does not. Since the sulphur is chemically combined, its action on some metals is not believed to be the same as that of free sulphur. At temperatures of over 750°F. the rate of oxidation assumes practical significance, but not below this temperature. Oxida­ tion produces metal oxides which have no lubricating properties , although they may have anti-seizing or anti-weldin g properties. In the absence of air, however, lubricating properties are maintained at temperature s in excess of 750°F. Th e specific gravity of Molykote is approximately five and it will not remain suspended in liquids unless agitated . It is non-magnetic and has a specific resistance of 0.409 at 198°F., of 0.790 at 67°F. and 8.33 at 85°F. The cost of a ten pound tin of Molykote costs twenty dollars in the U.S.A. and it is estimated that ten ounces will liberally cover 500 squar e feet of smooth metal with a tenacious coating. 16 Scientific LUBRICATION April, 1950

Journal

Industrial Lubrication and TribologyEmerald Publishing

Published: Apr 1, 1950

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