The NLGI HPM specification includes several additional and more-severe tests than required to meet the long-standing NLGI GC-LB grease specification, including…
Four-ball extreme-pressure testing evaluates protection under the high-load conditions encountered by bearings and components.
Copper-strip corrosion testing ensures compatibility with copper-containing alloys used in modern machinery.
Extended oxidation testing runs longer and at higher temperatures, simulating the thermal stress seen in modern high-performance applications.
Mechanical-stability testing is performed under higher temperatures for extended periods, ensuring greases maintain proper consistency in demanding conditions.
Water-resistance testing goes beyond simple washout to include water spray-off testing.
Contamination-resistance testing evaluates how well the grease maintains its protective properties when contaminated with dust and debris.
See the November AMSOIL Magazine for more information.
