ASTM D2265 for dropping point of lubricating grease
ASTM D2265 standard test method for dropping point of lubricating grease over wide temperature range
1. Scope
1.1 This test method covers the determination of the dropping point of lubricating grease.
1.2 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 ASTM Standards:
D217 Test Methods for Cone Penetration of Lubricating Grease
D235 Specifications for Mineral Spirits (Petroleum Spirits) Hydrocarbon Dry Cleaning Solvent
D566 Test Method for Dropping Point of Lubricating Grease
D3244 Practice for Utilization of Test Data to Determine Conformance with Specifications
E1 Specification for ASTM Thermometers
3. Terminology
3.1 Definitions:
3.1.1 dropping point, n-a numerical value assigned to a grease composition representing the corrected temperature at which the first drop of material falls from the test cup and reaches the bottom of the test tube.
3.1.1.1 Discussion - In the normal and proper operation of this test method, the observed dropping point is corrected by adding to it a value representing one third of the difference between the oven block temperature and the observed dropping point temperature. This corrected value is recorded as the dropping point of the grease.
3.1.2 lubricating grease, n-a semi-fluid to solid product of a thickener in a liquid lubricant.
3.1.2.1 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 are commonly included to impart special properties.
3.1.3 observed dropping point, n-the value noted on the thermometer monitoring the internal temperature of the grease test cup when the first drop of material falls from the test cup and reaches the bottom of the test tube.
3.1.4 thickener, n-in lubricating grease, a substance composed of finely-divided particles dispersed in a liquid to form the product's structure.
3.1.4.1 Discussion - Thickeners can be fibers (such as various metallic soaps) or plates or spheres (such as certain non-soap thickeners), which are insoluble or, at 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.
