Machinery Lubrication magazine published by Noria Corporation
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some take it as a seal of approval for the grease to used virtually everywhere. is could not be further from the truth. To understand how the term "multi- purpose" was introduced and why it is so prevalent in grease nomenclature, we need to understand how greases are specified and tested. e de facto authority in grease is the National Lubricating Grease Institute (NLGI), a membership group comprised of lubrica nt ma nufacturers, resea rchers, consultants and end-users. is group is a working group that helps create standards as well as share technical information among its members. As such, the NLGI was instru- mental in the creation of a grease standard for automotive greases known as ASTM D 4950, which outlined the performance charac- teristics and specifications for greases used for chassis and wheel bearing applications. ese greases were denoted by a series of letters that corresponded with their degree of service. e prefix "L" was chosen for chassis applications, while "G" was chosen for wheel bearings. ese were further characterized by a second letter that coincides with the severity of service. For chassis, LA means light-duty, LB for severe duty and then a similar scale for wheel bearings of GA through GC. ere are a series of performance criteria that must be met by the grease in order to achieve these ratings, but early on, it became apparent that a single grease might be able to perform well in both applications and thus pass the specification and testing for both chassis and wheel bearings. Hence these greases became marketed and known as "multipurpose" grease and bore the dual certification GC-LB. is nomenclature stuck, and now if you simply do an internet search for multipurpose grease, you will be awash in results from multiple ML GROUP PUBLISHER Brett O'Kelley - bokelley@noria.com SENIOR EDITOR Jim Fitch - jfitch@noria.com EDITORS Nick Holder - nholder@noria.com Marissa Menge - mmenge@noria.com Hayden Beeson - hbeeson@noria.com Kate Perryman - kperryman@noria.com TECHNICAL WRITERS Wes Cash - wcash@noria.com Bennett Fitch - bfitch@noria.com Devin Jarrett - djarrett@noria.com Travis Richardson - trichardson@noria.com Paul Farless - pfarless@noria.com CREATIVE DIRECTOR Josh Couch - jcouch@noria.com GRAPHIC ARTISTS Patrick Clark - pclark@noria.com Matt Berkenbile - mberkenbile@noria.com ADVERTISING SALES Brett O'Kelley - bokelley@noria.com MEDIA PRODUCTION COORDINATOR Sheryl Adekoya - sadekoya@noria.com CORRESPONDENCE You may address articles, case studies, special requests and other correspondence to: Editor MACHINERY LUBRICATION Noria Corporation 1328 E. 43rd Court • Tulsa, Oklahoma 74105 Phone: 918-749-1400 Fax: 918-746-0925 Email address: editor@noria.com MACHINERY LUBRICATION Volume 25 - Issue 4 July - August 2021 ( USPS 021-695) is published bimonthly by Noria Corporation, 1328 E. 43rd Court, Tulsa, OK 74105-4124. Periodicals postage paid at Tulsa, OK and additional mailing offices. POSTMASTER: Send address changes and form 3579 to MACHINERY LUBRICATION, 1328 E. 43rd Court, Tulsa, OK 74105-4124. SUBSCRIBER SERVICES: The publisher reserves the right to accept or reject any subscription. Send subscription orders, change of address and all subscription-related correspondence to: : Noria Corporation, 1328 E. 43rd Court, Tulsa OK 74105-4124. 918-749- 1400 or Fax: 918-746-0925 Copyright © 2021 Noria Corporation. Noria, Machinery Lubrica - tion and associated logos are trademarks of Noria Corporation. All rights reserved. Reproduction in whole or in part in any form or medium without express written permission of Noria Corpo- ration is prohibited. Machinery Lubrication is an independently produced publication of Noria Corporation. Noria Corporation reserves the right, with respect to submissions, to revise, republish and authorize its readers to use the tips and articles submitted for personal and commercial use. The opinions of those interviewed and those who write articles for this magazine are not necessarily shared by Noria Corporation. CONTENT NOTICE: The recommendations and information provided in Machinery Lubrication and its related information properties do not purport to address all of the safety concerns that may exist. It is the responsibility of the user to follow appro - priate safety and health practices. Further, Noria does not make any representations, warranties, express or implied, regarding the accuracy, completeness or suitability of the information or recommendations provided herewith. Noria shall not be liable for any injuries, loss of profits, business, goodwill, data, interruption of business, nor for incidental or consequential merchantability or fitness of purpose, or damages related to the use of information or recommendations provided.