The ASTM D1264 test, in which a grease-packed ball bearing spins at 600 rpm for an hour under a jet of water at 38 C or 79 C, and the mass lost is reported as a percentage. Good water-resistant greases lose under 5 percent at 79 C. The related spray-off test, ASTM D4049, blasts grease off a plate. Buyers lean on both numbers when picking grease for wet-end paper machinery, washdown lines, marine and mining equipment.
Water washout at 79 C was 2 percent on the cal sulf and 12 on the lithium, easy pick for the wash line.
Also heard as
- water washout resistance
- washout
Related terms
Calcium sulfonate
Grease thickener based on overbased calcium sulfonate, known for water resistance and built-in EP protection.
Grease
Semi-solid lubricant made of oil held in a thickener sponge, usually with additives.
Tackifier
Polymer additive that makes a lubricant sticky and stringy so it clings to chains, open gears and slides.
Milkshake
Oil turned milky or creamy by emulsified water, seen in gearboxes, hydraulics and engines.