1. Scope
1.1 This test method covers determination of the changes in the consistency, as measured by cone penetration, of lubricating greases when worked in the roll stability test apparatus.
1.2 The values stated in inch-pound units for the apparatus dimensions are to be regarded as standard; the SI conversions are provided for information only. All other values stated in SI units are standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTMStandards:
D217 Test Methods for Cone Penetration of Lubricating Grease
D1403 Test Methods for Cone Penetration of Lubricating Grease Using One-Quarter and One-Half Scale Cone Equipment
D4175 Terminology Relating to Petroleum, Petroleum Products, and Lubricants
3. Terminology
3.1 Definitions:
3.1.1 lubricating grease, n-asemi-fluid to solid product of a dispersion of a thickener in a liquidl ubricant.
3.1.1.1 Discussion - The dispersion of the thickener forms a two-phase system and immobilizes the liquid lubricant by surface tension and other physical forces. Other ingredients imparting special properties are often included.
3.1.2 lubricant, n-any material interposed between two surfaces that reduces the friction or wear between them.
3.1.3 thickener, n-in lubricating grease, a substance composed of finely divided particles dispersed in a liquid lubricant to form the product's structure.
3.1.3.1 Discussion - The thickener can be fibers (such as various metallic soaps) or plates or spheres (such as certain non-soap thickeners) which are insoluble or, at the most, only very slightly soluble in the liquid lubricant. The general requirements are that the solid particles be extremely small, uniformly dispersed, and capable of forming a relatively stable, gel-like structure with the liquid lubricant.
3.1.4 consistency, n-of lubricating grease, the degree of resistance to movement under stress.
3.1.4.1 Discussion - The term consistency is used somewhat synonymously with penetration. Generally, consistency refers to the worked penetration of a grease.
3.1.5 penetration, n-of lubricating grease, the depth that the standard cone, when released to fall under its own weight for 5s, enters the sample.
3.1.6 working, n-of lubricating grease, the subjection of a sample to the shearing action of the standard grease worker.
3.1.7 worked penetration, n-of lubricating grease, the penetration at 25°C (77°F), without delay, of a sample after 60 double strokes in a standard grease worker.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 rollstability, n-of lubricating grease, the change in consistency of a sample after a specified amount of working in a test apparatus utilizing a weighted roller inside a rotating cylinder.
