ASTM D4049 Standard Test Method for Determining the Resistance of Lubricating Grease to Water Spray
1. Scope
1.1 This test method covers the ability of a grease to adhere to a metal surface when subjected to a water spray under prescribed laboratory conditions.
1.2 The values stated in SI units are to be regarded as 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.
2. Referenced Documents
2.1 ASTM Standards:
D217 Test Methods for Cone Penetration of Lubricating Grease
D1742 Test Method for Oil Separation from Lubricating Grease During Storage
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions:
3.1.1 lubricating grease, n - a semi-fluid to solid product 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 by surface tension and other physical forces. Other ingredients are commonly included to impart special properties.
3.1.2 oil separation, n - the appearance of a liquid fraction from an otherwise homogeneous lubricating composition.
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 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.
