SPI Vacuum Greases
NGLI Grades
The term "NGLI" refers to the National
Lubricating Grease Institute, an organization that produces new
standards for grease performance, production, applications, etc.. The NLGI
Grade that is mentioned on the SPI Supplies website refers to the grade
(as determined by the NGLI) of the grease.
An NGLI grease "grade" is similar in many ways to an oil viscosity
measurement. A grease is made by taking oil, adding thickener and sometimes
additives to impart special characteristics to the grease. For example,
some additives protect metal surfaces against corrosion. The testing of
the grease, and the derivation of the "grade" is done by testing by dropping
a special cone into the grease to achieve a "penetration" number. This
number equates to a rating of 000 (semi fluid=melted ice cream) to 6
(frozen butter).
Generally speaking, 80% of the applications in the world for vacuum grease
use a #2 grade.
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Saturday July 05, 2008
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