An elastic, jelly-like material that resembles a solid but flows like a liquid. Most gels are dispersions of liquids in networks of colloidal particles or polymers.
See Lubricating Grease.
A device designed to apply shear to a grease. The full-scale grease worker consists of a metal cup of standard dimensions, and a cover fitted with a handle and shaft attached to a metal plate drilled with 61.x Â¼-inch holes. The plate is designed to be pushed through the grease sample to be worked. The device can be manually or mechanically driven. For Â½-scale and Â¼-scale penetrations, the equipment is progressively smaller. The equipment details can be found in ASTM D217 (full-scale) and ASTM D1403 (small-scale).
A machined metal cup that holds grease for working. It is also the cup that is used to hold the grease for penetration measurement. A full-scale worker cup holds about one pound (450grams) of grease. See ASTM D217 for the details of the cup dimensions. Smaller scale (Â½- and Â¼-scale) worker cups are detailed in ASTM D1403.