ASTMD892-2003

Designation:D 892-03An American National StandardBritish Standard 5092INTERNATIONALIPDesignation:146/2000Standard Test Method forFoaming Characteristics of Lubricating Oils1This standard is issued under the fi xed designation D 892;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon (e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope*3.1.1.1 Discussion-In this test method the diffuser may be1.1 This test method covers the determination of the foam-made of either metallic or non-metallic materials.ing characteristics of lubricating oils at 24C and 93.5C.3.1.2 entrained air (or gas),nin liquids,a two-phaseMeans of empirically rating the foaming tendency and themixture of air (or gas)dispersed in a liquid in which thestability of the foam are described.volume of the liquid is the major component.1.2 The values stated in acceptable SI units are to be3.1.2.1 Discussion-The air (or gas)is in the form ofregarded as the standard.discrete bubbles of about 10 to 1000 um in diameter.The1.3 This standard does not purport to address all of thebubbles are not uniformly dispersed.In time they tend to risesafety concerns,if any,associated with its use.It is theto the surface to coalesce to form larger bubbles which break orresponsibility of the user of this standard to establish appro-form foam.Subsurface coalescence can also occur,in whichpriate safety and health practices and determine the applica-case,the bubbles rise more rapidly.bility of regulatory limitationsprior to use.For specific3.1.3 foam,nin liquids,a collection of bubbles formed inwarning statements,see Sectionsand⑨.1.□the liquid or on (at)its surface in which the air (or gas)is themajor component on a volumetric basis.2.Referenced Documents3.1.4 lubricant,nany material interposed between two2.1 ASTM Standards:surfaces that reduces the friction or wear between them.D 445 Test Method for Kinematic Viscosity of TransparentD4175-88and Opaque Liquids and the Calculation of Dynamic3.1.4.1 Discussion-In this test method,the lubricant is anViscosity2oil which can or can not contain additives such as foamD4175 Terminology Relating to Petroleum,Petroleuminhibitors.Products,and Lubricants3.1.5 maximum pore diameter,n-in gas diffusion,theE 1 Specifi cation for ASTM Thermometersdiameter a capillary of circular cross section which is equiva-E 128 Test Method for Maximum Pore Diameter and Per-lent(with respect to surface tension effects)to the largest poremeability of Rigid,Porous Filters for Laboratory Usesof the diffuser under consideration.3.1.5.1 Discussion-The pore dimension is expressed in3.Terminologymicrometres in this test method.3.1 Definitions3.1.6 permeability,nin gas diffusion,the flow of gas,3.1.1 diffuser,n-for gas,a devic