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The NLGI consistency number is also a component of the code specified in standard ISO 6743-9 “lubricants, industrial oils and related products (class L) — classification — part 9: family X (greases)”. [1] The NLGI consistency number alone is not sufficient for specifying the grease required by a particular application.
The NLGI was incorporated by a small number of U.S. companies in 1933 to create a code for the National Recovery Act. The original name of the organization was the National Association of Lubricating Grease Manufacturers, Inc. The name was changed in 1937 as the industry recognized the need for a joint development and standards association and ...
The measure of the consistency of grease is commonly expressed by its NLGI consistency number. The main elements of standard ATSM D4950 and NLGI's consistency classification are reproduced and described in standard SAE J310 “automotive lubricating greases” published by SAE International.
It was introduced in 1974 as a Multi-grade 5W20 viscosity synthetic motor oil. The brand now includes multi-grade motor oils, oil filters, synthetic grease, transmission fluids, and gear lubricants. [14] The Esso and Exxon motor oil brands have largely been discontinued.
Other naturally derived lubricants include lanolin (wool grease, a natural water repellent). [ 10 ] Whale oil was a historically important lubricant, with some uses up to the latter part of the 20th century as a friction modifier additive for automatic transmission fluid .
In 1 H NMR, silicone grease appears at a singlet at δ = 0.07 ppm in CDCl 3, 0.09 in CD 3 CN, 0.29 in C 6 D 6, and −0.06 ppm in (CD 3) 2 SO. In 13 C NMR, it appears at δ = 1.19 ppm in CDCl 3 and 1.38 ppm in C 6 D 6. Tables of impurities commonly found in NMR spectroscopy have been prepared, and such tables include silicone grease. [9]