The Best Base Stocks for Grease?
More than 30 years ago, the National Lubricating Grease Institute published its GC-LB specification. Originally designed for greases used in wheel bearings and automotive chasses, the spec now encompasses greases used in a variety of applications. While the spec remains valid, a new one—the High Performance Multiuse spec—was published in Dec. 2020.
“Due to advancements in materials, technologies and applications, NLGI has recognized that current applications may be better served by updated specifications,” the organization said.
Luca Salvi—product development STP principal at ExxonMobil Technology & Engineering Co.—and Joe Kaperick—senior advisor of grease technology at Afton Chemical and past president of NLGI—studied the difference in performance between finished greases formulated with mineral oil and synthetic base oil. Specifically, they were concerned with different greases’ ability to pass certain tests of the GC-LB and HPM specs.