Testing Services, Inc
General purpose lubricating greases are usually based on lithium, calcium or sodium soaps and include some EP greases and lithium complex grease. Specialty greases [high-specification greases] are formulated to meet rigorous specifications and based on complex soaps combined with highly refined or synthetic base oils and additives. While mineral oil based grease is the most common. Others are: water based lubricants, industrial grease, high temperature grease, dry film lubricants, conveyor lubricants, bearing grease, moly lubricant, synthetic grease – 3/24, dry lubricant bearing grease, and moly grease to name a few,
According to The National Lubricating Grease Institute (NLGI) -- an international technical trade association that serves the lubricating grease and gear lubricant industry:
the past, the diversity of specifications for automotive service greases, as
established by the original equipment manufacturer (OEM), made it difficult for
the marketer of lubricating greases to make available all the many specified
products. Finally, the Society of Automotive Engineers, the American Society for
Testing and Materials and NLGI, forming a tripartite group, all played their
respective roles in establishing ASTM D 4950 as a standard for automotive
service greases. As a result, OEM's, suppliers and consumers have a common
language to use when describing lubricating greases for automotive service.
D 4950 includes specifications for two category groups: chassis lubricants
(letter "L" prefix) and wheel bearing lubricants (letter "G"
prefix). Performance classifications within these groups result in two letter
designations for chassis greases (LA and LB) and three for wheel bearing greases
(GA, GB, and GC) The automotive industry is in general agreement that the
highest performance category, to date, in each group (LB and GC) is suitable for
the development of these categories, the Institute implemented its NLGI service
classification as a means of identifying to the consumer the two highest
performance levels: GC and LB; the combination, GC-LB, represents a
multi-purpose category. In the future, NLGI will revise the system concurrently
with any changes made to ASTM D 4950.
To facilitate easy, accurate identification to all users, NLGI has made available to the industry an identifying symbol, i.e., the NLGI Certification Mark, to be displayed on grease packaging. Those OEM owner's manuals that illustrate this mark will advise users to use only those greases carrying this mark on the label.
Standard Classification and Specification of Automotive Service Greases
D217 provides information about the compatible of products -- under ideal
conditions to actual plant conditions -- and their consistency or incompatibility..
and more ...
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laboratory uses the methods and standards of this organization
ASTM [ American Standard and Testing Material ]
For detailed information see the ASTM website at: http://www.ASTM.ORG
established industry standards.
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