1、Designation: D1122 16Standard Test Method forDensity or Relative Density of Engine Coolant Concentratesand Engine Coolants By The Hydrometer1This standard is issued under the fixed designation D1122; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 Th
3、is test method covers the determination of the relativedensity of engine coolant concentrates and engine coolants.1.2 The values stated in SI units are to be regarded asstandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety co
4、ncerns, 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.2. Referenced Documents2.1 ASTM Standards:2D1176 Practice for Sampling and Prepa
5、ring Aqueous Solu-tions of Engine Coolants or Antirusts for Testing PurposesE1 Specification for ASTM Liquid-in-Glass ThermometersE100 Specification for ASTM HydrometersE230/E230M Specification and Temperature-ElectromotiveForce (emf) Tables for Standardized Thermocouples3. Terminology3.1 Definition
6、s:3.1.1 relative density, nthe ratio of the density of amaterial at a stated temperature to the density of water at thesame stated temperature.4. Significance and Use4.1 The relative density of an engine coolant may be used todetermine the approximate percent glycol, freezing point, andboiling point
7、, provided the glycol type is known.4.2 The relative density of an engine coolant concentratecan be used as a production control test.5. Apparatus5.1 HydrometersHydrometers shall be of glass, graduatedin specific gravity range as listed in Table 1, and shall conformto Specification E100.5.2 Hydromet
8、er CylinderThe hydrometer cylinder inwhich the sample for the relative density test is confined shallbe made of clear glass and shall be cylindrical in shape. Forconvenience in pouring, it may have a lip on the rim. Theinside diameter of the cylinder shall be at least 25.4 mm(1.0 in.) greater than t
9、he outside diameter of the hydrometer.The height of the cylinder shall be such that the length of thecolumn of sample it contains is greater by at least 25.4 mm(1.0 in.) than the portion of the hydrometer which is immersedbeneath the surface of the sample after a state of equilibriumhas been reached
10、.5.3 Temperature Measuring Instrument(Environmentallysafe thermometer or thermocouple). An ASTM Partial Immer-sion Thermometer, having a range from 5 to 300C andconforming to the requirements for thermometer 2C or 2F, asprescribed in Specification E1, or some suitable non-mercurycontaining temperatu
11、re measuring device, such as athermocouple, capable of operating in the same temperaturerange and having equal or better accuracy as summarized inSpecification E230/E230M. See Section 8, Precision and Bias.5.4 Water BathA water bath capable of maintaining asample temperature of 15.5 6 0.3C (60 6 0.5
12、F) during thetest.6. Sampling6.1 Sample the coolant in accordance with Test MethodD1176, except as specified in this test method.7. Procedure7.1 If the coolant has a small amount of separated upperlayer, remove it before determining the relative density of thelower layer. To separate, pour the sampl
13、e into a 500-mL1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and Related Fluids and is the direct responsibility of SubcommitteeD15.03 on Physical Properties.Current edition approved April 1, 2016. Published April 2016. Originallyapproved in 1950. Last previous
14、edition approved in 2013 as D1122 13. DOI:10.1520/D1122-16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A
15、 Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1separatory funnel, allow to stand for3hatroom temperaturebut not below 20C (68F), and then draw off the lower layer.7.2 If
16、the original coolant is homogeneous, no separationwill be required.7.3 Cool the homogeneous sample or the separated lowerlayer sample to about 14C (57F). Pour the sample into theclean, dry hydrometer cylinder without splashing, so as toreduce to a minimum the formation of air bubbles (see Note 1).Pl
17、ace the cylinder vertically in the water bath and let thetemperature of the sample reach 15.0 6 0.3C (59 6 0.5F).Slowly and carefully lower the hydrometer into the sample toa level two smallest scale divisions below that at which it willfloat and then release the hydrometer. When the hydrometerhas c
18、ome to rest and floats freely away from the walls of thecylinder and the temperature has reached 15.5 6 0.3C (60 60.5F), read the hydrometer.NOTE 1When handling the sample (that is, mixing, transferring, orstirring) be careful to avoid formation of air bubbles. Remove any airbubbles by touching them
19、 with a clean, dry glass rod.7.4 The hydrometer is read in the following ways: If thesample is sufficiently transparent, place the eye slightly belowthe level of the liquid and slowly raise it until the surface of thesample changes from a distorted ellipse to a straight linecutting the hydrometer sc
20、ale. If the sample is opaque, read thepoint on the hydrometer scale to which the sample rises abovethe main surface of the liquid with the eye placed slightlyabove the plane of the surface of the sample. Correct thisreading by an amount equal to the height to which the samplerises on the hydrometer
21、stem above the main liquid surface.This height will vary for different coolants and differenthydrometers, and the correction will depend upon the width ofthe hydrometer scale graduations. Determine the correctionfactor for the hydrometer used by observing the height abovethe main surface of the liqu
22、id to which the coolant rises on thehydrometer scale when the hydrometer is immersed in atransparent liquid, such as an ethylene or propylene glycolsolution, having a surface tension similar to that of the sampleunder test.8. Precision and Bias8.1 Precision:NOTE 2Previous versions of this test metho
23、d permitted the use ofmercury-containing thermometers. The data for the Precision and Biasstatement were generated under earlier versions of the test method, andwere generated with mercury-filled thermometers.8.1.1 RepeatabilityFor different operators their resultsshould vary not more than 0.0012 fr
24、om the average value whenthe relative density of the engine coolant concentrate sample isbetween 1.0000 and 1.1300.8.1.2 ReproducibilityFor different apparatus the resultsshould vary not more than 0.0012 from the average value whenthe density or relative density of the engine coolants concen-trate i
25、s between 1.0000 and 1.1300.8.2 BiasBias of the procedure in this test method formeasuring density or relative density has not been determinedbecause an accepted reference material has not been deter-mined.9. Keywords9.1 engine coolant; engine coolant concentrate; hydrometer;relative densitySUMMARY
26、OF CHANGESSubcommittee D15.03 has identified the location of selected changes to this test method since the last issue(D1122 13) that may impact the use of this standard.(1) Removed last sentence of 5.3. (2) Added Note 2.TABLE 1 Available Hydrometer SetsASTM Hydrometer No. TypeRangeTotal Each Hydrom
27、eter111H to 117H for general use in heavy liquids 1.000 to 1.350 0.050D1122 162ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the vali
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