ASTM D1263 for leakage tendencies of automotive wheel bearing greases
1. Scope
1.1 This test method covers the evaluation of the leakage tendencies of wheel bearing greases when tested under prescribed laboratory conditions.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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. For specific hazard information see Note 2 and Annex A2.
2. Referenced Documents
2.1 ASTM Standards:
D217 Test Methods for Cone Penetration of Lubricating Grease
D3527 Test Method for Life Performance of Automotive Wheel Bearing Grease
D4175 Terminology Relating to Petroleum, Petroleum Products, and Lubricants
D4290 Test Method for Determining the Leakage Tendencies of Automotive Wheel Bearing Grease under Accelerated Conditions
E 1 Specification for ASTM Thermometers
E 77 Test Method for Inspection and Verification of Thermometers
3. Terminology
3.1 Definitions:
3.1.1 lubricating grease, n - a semi-fluid to solid product of a dispersion of a thickener in a liquid lubricant.
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 are commonly included to impart special properties.
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 solid 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 sightly 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.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 automotive wheel bearing grease, n - a lubricating grease specifically formulated to lubricate automotive wheel bearings at relatively high grease temperatures and bearing speed.
3.2.2 leakage, n - of wheel bearing grease, separation and overflow of grease or oil from the bulk grease charge, induced by high temperature and bearing rotation.
