1、Designation: D 1122 97a (Reapproved 2002)Standard Test Method forDensity or Relative Density of Engine Coolant Concentratesand Engine Coolants By The Hydrometer1This standard is issued under the fixed designation D 1122; the number immediately following the designation indicates the year oforiginal
2、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 Defens
3、e.1. Scope1.1 This 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
4、 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.2. Referenced Documents2.1 ASTM Standards:D 1176 Practice for Sa
5、mpling and Preparing Aqueous So-lutions of Engine Coolants or Antirusts for Testing Pur-poses2E 1 Specification for ASTM Thermometers3E 100 Specification for ASTM Hydrometers33. Terminology3.1 Definition:3.1.1 relative density, nthe ratio of the density of amaterial at a stated temperature to the de
6、nsity 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, provided the glycol type is known.4.2 The relative density of an engine coolant concentratecan b
7、e 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 E 100.5.2 Hydrometer CylinderThe hydrometer cylinder inwhich the sample for the relative density test is confined s
8、hallbe 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 (1.0in.) greater than the outside diameter of the hydrometer. Theheight of the cylinder shall be such that the length of
9、 thecolumn of sample it contains is greater by at least 25.4 mm (1.0in.) than the portion of the hydrometer which is immersedbeneath the surface of the sample after a state of equilibriumhas been reached.5.3 ThermometerAn ASTM Gravity Thermometer 12C,having a range from 20 to +120C (or 12F having a
10、rangefrom 5 to +215F) and conforming to Specification E 1.5.4 Water BathA water bath capable of maintaining asample temperature of 15.5 6 0.3C (60 6 0.5F) during thetest.6. Sampling6.1 Sample the coolant in accordance with Test MethodD 1176, except as specified in this test method.7. Procedure7.1 If
11、 the coolant has a small amount of separated upperlayer, remove it before determining the relative density of thelower layer. To separate, pour the sample into a 500-mLseparatory funnel, allow to stand for3hatroom temperaturebut not below 20C (68F), and then draw off the lower layer.7.2 If the origi
12、nal 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).Place the c
13、ylinder vertically in the water bath and let thetemperature of the sample reach 15.0 6 0.3C (59 6 0.5F).1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and is the direct responsibility of Subcommittee D15.03 on PhysicalProperties.Current edition approved Oct 10, 1
14、997. Published June 1998. Originallypublished as D 1122 50. Last previous edition D 1122 97.2Annual Book of ASTM Standards, Vol 15.05.3Annual Book of ASTM Standards, Vol 14.03.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Slowly an
15、d 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 come to rest and floats freely away from the walls of thecylinder and the temperature has reached 15.5 6 0.3C (60 60.5F), r
16、ead 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 with a clean, dry glass rod.7.4 The hydrometer is read in the following ways: If thesample is sufficiently transparent, p
17、lace 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 scale. If the sample is opaque, read thepoint on the hydrometer scale to which the sample rises abovethe main surface of the
18、 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 stem above the main liquid surface.This height will vary for different coolants and differenthydrometers, and the correcti
19、on 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 liquid to which the coolant rises on thehydrometer scale when the hydrometer is immersed in atransparent liquid, such as an et
20、hylene or propylene glycolsolution, having a surface tension similar to that of the sampleunder test.8. Precision and Bias8.1 Precision:8.1.1 RepeatabilityFor different operators their resultsshould vary not more than 0.0012 from the average value whenthe relative density of the engine coolant conce
21、ntrate 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 is between 1.0000 and 1.1300.8.2 BiasBias of the procedure in this test me
22、thod 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 densityASTM International takes no position respecting the validity of any patent rights
23、 asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any ti
24、me by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will
25、receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM
26、International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Available Hydrometer SetsASTM Hydrometer No. TypeRangeTotal Each Hydrometer111H to 117H for general use in heavy liquids 1.000 to 1.350 0.050D 1122 97a (2002)2
