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Designation: D6553 − 00 (Reapproved 2016)Standard Test Method forCoolant Compatibility of Way Lubricants 1This standard is issued under the f i xed designation D6553; 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 (´) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method measures the ability of single-use waylubricants to separate from metalworking coolants (syntheticcoolants, semisynthetic coolants, and soluble oils) or otheralkaline aqueous f l uids.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For specif i cwarning statements, see Section 7.2. Referenced Documents2.1 ASTM Standards: 2D1193 Specif i cation for Reagent WaterD1401 Test Method for Water Separability of Petroleum Oilsand Synthetic FluidsD4057 Practice for Manual Sampling of Petroleum andPetroleum Products3. Terminology3.1 Def i nitions:3.1.1 cuff—a layer between the way oil layer and the coolantor buffer layer that contains signif i cant amounts of both. Indescribing this intermediate layer, cuff is preferred to emulsionsince many of the coolants are themselves emulsions.4. Summary of Test Method4.1 This test procedure is essentially identical to TestMethod D1401, with the actual coolant or an alkaline bufferreplacing the distilled water of that test method. A 40 mLsample and 40 mL of either actual coolant or a pH 9.0 buffersolution (see Note 1) are stirred for 5 min at 54 °C (see Note 2)in a graduated cylinder. The time required for the separation ofthe emulsion thus formed is recorded. If complete separation oremulsion reduction to 3 mL or less does not occur afterstanding for 30 min, the volumes of oil (or f l uid), water, andemulsion remaining at the time are reported.N OTE 1—Distilled water is not a satisfactory aqueous phase for testingthe ability of way lubricants to separate from coolants because distilledwater gives different results from coolants. The best procedure is to use theactual coolant that the way lubricant will contaminate.Abuffer solution ofpH 9.0 may be used in place of a specif i c coolant to predict theseparability from alkaline coolants in general.N OTE 2—It is recommended, however, that the test temperature beraised to 82 °C 6 1 °C when testing way lubricants more viscous than90 cSt (mm 2 /s) at 40 °C.5. Signif i cance and Use5.1 In the normal use of a way lubricant in a machine tool,the way lubricant eventually becomes a contaminant that mayemulsify into the coolant. It is generally desirable to removethis contaminant by skimming; otherwise, the coolant lifetimemay be signif i cantly shortened. This test method provides aguide for determining the separability characteristics of waylubricants that are expected to get into aqueous alkalinemetalworking coolants. It is used for specif i cation of new oilsand might be useful in monitoring of in-service oils.6. Apparatus6.1 Cylinder, 100 mL, graduated from 5 mL to 100 mL in1.0 mL divisions, made of glass, heat-resistant glass, or achemical equivalent. The inside diameter shall be no less than27 mm and no more than 30 mm throughout its length,measured from the top to a point 6 mm from the bottom of thecylinder. The overall length of the cylinder shall be 225 mm to260 mm. The graduation shall not be in error by more than1 mL at any point on the scale.6.2 Heating Bath, sufficiently large and deep enough topermit the immersion of at least two test cylinders in the bathliquid up to their 85 mL graduations. The bath shall be capableof being maintained at a temperature of 54 °C 6 1 °C (seeNote 2), and shall be f i tted with clamps, which hold thecylinder in a position so that the longitudinal axis of the paddlecorresponds to the vertical center line of the cylinder during the1 This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility ofSubcommittee D02.L0.01 on Metal Removal Fluids and Lubricants.Current edition approved Jan. 1, 2016. Published February 2016. Originallyapproved in 2000. Last previous edition approved in 2005 as D6553 – 00 (2010).DOI: 10.1520/D6553-00R106.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1