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RHEOPECTIC GREASE

RHEOPECTIC GREASE RHEOPECTI C GREAS E A Rheopectic Grease is one that solidifies upon flow- ing, or at least that is its meaning expressed practically. The advantages of such a grease are mainly concerned with its use in mechanical lubri­ cators, because they can be easily pumped and yet will not drip when they reach the bearing. Greases have the disadvantage that they may be difficult to pump and may not easily flow through restricted passages in the pump. It is in view of the possibility of fitting chassis lubricators to motor cars in the future tha t a study of rheopectic greases may prove timely. The subject has been reviewed by Neesley, Brunstrum and Liehe (all of the Research Department, Standard Oil Company, Indiana), in a paper to the S.A.E. at Atlantic City in June. The American chassis lubri­ cator, the Multi-Luber (described in our August issue) was partly responsible for this work, and the authors describe how this new lubricant functions in this unit. Flo w propertie s of conventional oil, dripless oil and grease are compared with those of rheopectic grease in the diagram. Rheopectic grease feeds operated similarly at temperatures down to —20°F. readily under low stress and is irreversibily converted At temperatures of 100°F. no evidence of drippage to a grease upon dispensing. from the chassis under static conditions was observed. The grade studied consisted of a lithium soap and Doubtless, providing the lubricating properties of a mineral oil of about 130 Redwood Seconds at 140°F. this grease are all that are desired, it must have a The products used for comparison were a dripless wide variety of uses apart from services in mechanical oil containing 2% of hydrocarbon polymer in an oil or automatic chassis lubricators. of about 330 Redwood Sec. and a chassis grease made with 4.5% calcium soap and an oil of about 123 Redwood Sec. at 140°F . "ELEKTRION" OILS Agitation at low shear rate has no effect on the IN FRANCE AND ITALY. rheopectic grease, and when a tin of this was shaken for 24 hours, its consistency showed no change. The OZO Iliano Company, which is controlled by When "worked" at varying rates of high shear, Omnium Francaise des Petroles, Paris, and who have however, its consistency changed to a final value. a refinery at Montava, Italy, are now selling Elek- This final consistency was reached after one pass trion oils at all their service stations throughout through the Multi-Luber chassis lubricator — and Italy. These oils are thus available from over 500 doubtless would similarly change through any con­ garages in Italy. Elektrion Oils are manufactured ventional mechanical lubricator pump. by Societe des Huiles de Cavel & Roegiers, S.A., This grease shows oil-like flow properties at low Coupure 221, Ghent, Belgium. shear rates, (where ordinary greases are semi-solid) According to Informations Commerciales (10th June and is therefore initially similar in service to dripless 1955), Elektrion Oils authorised for importation oil. into France during the period 1st April 1955—31st It s final consistency, however, after passing through March, 1956, equal in volume the total authorisation a lubricator, is similar to that of a chassis grease, as for all other Belgium oils. The same list shows that the diagram shows. It should be remembered, that the only lubricating oils receiving authorisation for all this time during service, the grease in the reservoir exporting from Belgium to Belgium North Africa is still unchanged. This grease is reported to have are Elektrion grades. Scientific LUBRICATION September, 1955 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

RHEOPECTIC GREASE

Industrial Lubrication and Tribology , Volume 7 (9): 1 – Sep 1, 1955
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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0036-8792
DOI
10.1108/eb052357
Publisher site
See Article on Publisher Site

Abstract

RHEOPECTI C GREAS E A Rheopectic Grease is one that solidifies upon flow- ing, or at least that is its meaning expressed practically. The advantages of such a grease are mainly concerned with its use in mechanical lubri­ cators, because they can be easily pumped and yet will not drip when they reach the bearing. Greases have the disadvantage that they may be difficult to pump and may not easily flow through restricted passages in the pump. It is in view of the possibility of fitting chassis lubricators to motor cars in the future tha t a study of rheopectic greases may prove timely. The subject has been reviewed by Neesley, Brunstrum and Liehe (all of the Research Department, Standard Oil Company, Indiana), in a paper to the S.A.E. at Atlantic City in June. The American chassis lubri­ cator, the Multi-Luber (described in our August issue) was partly responsible for this work, and the authors describe how this new lubricant functions in this unit. Flo w propertie s of conventional oil, dripless oil and grease are compared with those of rheopectic grease in the diagram. Rheopectic grease feeds operated similarly at temperatures down to —20°F. readily under low stress and is irreversibily converted At temperatures of 100°F. no evidence of drippage to a grease upon dispensing. from the chassis under static conditions was observed. The grade studied consisted of a lithium soap and Doubtless, providing the lubricating properties of a mineral oil of about 130 Redwood Seconds at 140°F. this grease are all that are desired, it must have a The products used for comparison were a dripless wide variety of uses apart from services in mechanical oil containing 2% of hydrocarbon polymer in an oil or automatic chassis lubricators. of about 330 Redwood Sec. and a chassis grease made with 4.5% calcium soap and an oil of about 123 Redwood Sec. at 140°F . "ELEKTRION" OILS Agitation at low shear rate has no effect on the IN FRANCE AND ITALY. rheopectic grease, and when a tin of this was shaken for 24 hours, its consistency showed no change. The OZO Iliano Company, which is controlled by When "worked" at varying rates of high shear, Omnium Francaise des Petroles, Paris, and who have however, its consistency changed to a final value. a refinery at Montava, Italy, are now selling Elek- This final consistency was reached after one pass trion oils at all their service stations throughout through the Multi-Luber chassis lubricator — and Italy. These oils are thus available from over 500 doubtless would similarly change through any con­ garages in Italy. Elektrion Oils are manufactured ventional mechanical lubricator pump. by Societe des Huiles de Cavel & Roegiers, S.A., This grease shows oil-like flow properties at low Coupure 221, Ghent, Belgium. shear rates, (where ordinary greases are semi-solid) According to Informations Commerciales (10th June and is therefore initially similar in service to dripless 1955), Elektrion Oils authorised for importation oil. into France during the period 1st April 1955—31st It s final consistency, however, after passing through March, 1956, equal in volume the total authorisation a lubricator, is similar to that of a chassis grease, as for all other Belgium oils. The same list shows that the diagram shows. It should be remembered, that the only lubricating oils receiving authorisation for all this time during service, the grease in the reservoir exporting from Belgium to Belgium North Africa is still unchanged. This grease is reported to have are Elektrion grades. Scientific LUBRICATION September, 1955

Journal

Industrial Lubrication and Tribology – Emerald Publishing

Published: Sep 1, 1955

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