1、Designation: D1120 16Standard Test Method forBoiling Point of Engine Coolants1This standard is issued under the fixed designation D1120; 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 parenth
2、eses 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 This test method covers the determination of the equi-librium boi
3、ling point of engine coolants. The equilibriumboiling point indicates the temperature at which the sample willstart to boil in a cooling system under equilibrium conditions atatmospheric pressure.NOTE 1Engine coolants may also be marketed in a ready-to-use form(prediluted). This test procedure is ap
4、plicable to diluted solutions as wellas to concentrates.NOTE 2The procedure for obtaining a representative test sample of acoolant solution that contains an antileak additive is found in PracticeD1176.1.2 The values stated in SI units are to be regarded asstandard. The values given in parentheses ar
5、e for informationonly.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
6、to use.2. Referenced Documents2.1 ASTM Standards:2D1176 Practice for Sampling and Preparing Aqueous Solu-tions of Engine Coolants orAntirusts for Testing PurposesE1 Specification for ASTM Liquid-in-Glass ThermometersE230/E230M Specification and Temperature-ElectromotiveForce (emf) Tables for Standar
7、dized Thermocouples3. Summary of Test Method3.1 Sixty millilitres (two ounces) of the sample are boiledunder equilibrium conditions at atmospheric pressure in a100-mL flask. The temperature of the liquid corrected forbarometric pressure is the boiling point.4. Apparatus (see Fig. 1)4.1 FlaskA 100-mL
8、 round-bottom, short-neck, heat-resistant glass flask having a neck with a1938 standard-taper,female ground-glass joint and a 10-mm (0.4-in) outside diam-eter side-entering tube, so located as to permit the end of thethermometer device to be directly centered in the flask 6.5 mm(0.26 in.) from the b
9、ottom. The flask is shown in Fig. 2.4.2 CondenserThe condenser shall be of the water-cooled,reflux, glass-tube type, having a condenser jacket 200 mm(7.9 in.) in length. The bottom end of the condenser shall havea1938 standard-taper, drip-tip, male ground-glass joint.4.3 Boiling StonesThree or four
10、silicon carbide grains,grit No. 8 or other suitable inert chips, shall be used for eachdetermination. For samples exhibiting heavy foam, moreboiling chips may be added.4.4 Temperature Measuring Instrument (EnvironmentallySafe Thermometer or Thermocouple)An ASTM Partial Im-mersionThermometer, having
11、a range from 5 to 300C (20 to580F) and conforming to the requirements for Thermometer2C or 2F, as prescribed in Specification E1, or some othersuitable non-mercury containing temperature measuringdevice, such as a thermocouple, capable of operating in thesame temperature range and having equal or be
12、tter accuracy assummarized in Specification E230/E230M. See Section 10,Precision and Bias.4.5 Heat SourceAsuitable electric heating mantle shall beused, such that sufficient heat can be obtained to comply withthe heating and refluxing rates specified in Section 7.5. Sample5.1 To obtain a sample of u
13、nused concentrated coolant forboiling point determination, the following procedure is sug-gested:5.1.1 Allow material as received in the original container tocome to room temperature 20C (68F) but not below 20Cminimum).5.1.2 Shake the container to mix any material that may haveseparated.1This test m
14、ethod 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 as D1120 50 T. Last previous edition appro
15、ved in 2011 asD1120 111. DOI: 10.1520/D1120-16.2For 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 Summary of
16、Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.1.3 Immediately remove desired sample for test require-ment.5.2 To prepare a dilute solution of any mixture, thoroughlymix the sample
17、, pipet the required volume into a calibratedvolumetric flask, and add distilled water to bring the mixedcontents of the flask to the proper volume while maintainingthe calibration temperature.5.3 The procedure for obtaining a representative test sampleof a coolant solution that contains an antileak
18、 additive is foundin Practice D1176.6. Preparation of Apparatus6.1 Use a calibrated temperature measuring instrument(thermometer or thermocouple).6.2 Insert the calibrated temperature measuring instrumentthrough the side tube until the tip of the bulb is 6.5 mm(0.26 in.) from the bottom of the cente
19、r of the flask. Make aseal around the temperature measuring instrument with a shortpiece of rubber tubing or other suitable material.6.3 Place 60 mL (2 oz) of the sample to be tested, togetherwith three or four silicon carbide grains, into the flask.6.4 Attach the chemically cleaned condenser to the
20、 flask andmount the flask in an appropriate heating mantle. Support theglassware by a laboratory-type ring support and stand. Thewhole assembly is held in place by a clamp. Connect thecooling water inlet and outlet tubes to the condenser.7. Procedure7.1 When assembled as shown in Fig. 1, turn on the
21、condenser water and apply heat by means of an electric heaterat such a rate that the sample is brought to its boiling pointwithin 15 min. Heat strongly until boiling is reached and thenreduce heat input slowly until the required reflux rate isobtained. Adjust the rate of reflux over the next 10-min
22、periodto 1 to 2 drops of reflux per second. To obtain accurate results,it is important to carefully observe the specified reflux rate andmaintain the proper reflux rate for 2 min before reading thetemperature.7.2 Record the observed temperature and the barometricpressure.8. Calculation8.1 Temperatur
23、e Measuring Instrument InaccuracyCorrect the observed temperature by applying the correctionfactor obtained in calibrating the thermometer or thermocouplefor inaccuracy (6.1).8.2 Variation from Standard Barometric PressureThiscorrection shall be applied to the observed temperature aftercorrection fo
24、r inaccuracy of the thermometer. Use Table 1 todetermine the barometric correction.9. Report9.1 Report the following information:9.1.1 The equilibrium boiling point as the observed tem-perature rounded off to the nearest 0.3C (0.5F), corrected forthermometer or thermocouple inaccuracy and barometric
25、 pres-sure.FIG. 1 Boiling Point Test ApparatusFIG. 2 Short-Neck Flask, 100 mLD1120 16210. Precision and Bias10.1 Precision:NOTE 3Previous versions of this test method permitted the use ofmercury-containing thermometers. The data for the Precision and Biasstatement were generated under earlier versio
26、ns of the test method, andwere generated with mercury-filled thermometers.10.1.1 ReproducibilityFor diluted samples boiling below100C (212F), results should not differ from each other bymore than 1.4C (2.5F) and, for samples boiling above 100C(212F), results should not differ from each other by more
27、 than2.5C (4.5F).10.1.2 For unused concentrated samples boiling below100C (212F), results should not differ from each other bymore than 1.4C (2.5F), and for samples boiling above 100C(212F), results should not differ by more than 5.6C (10F).10.2 BiasSince there is no accepted reference materialsuita
28、ble for determining the bias for the procedure in this testmethod, bias has not been determined.11. Keywords11.1 boiling point; engine coolantSUMMARY OF CHANGESSubcommittee D15.03 has identified the location of selected changes to this standard since the last issue(D1120-11) that may impact the use
29、of this standard.(1) Removed last sentence of 4.4. (2) Added Note 3.ASTM 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 validity of any
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34、 Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Corrections for Barometric PressureAObserved TemperatureCorrected for TemperatureMeasuring InstrumentInaccuracyCorrection per 1-mm HgDifference in PressureBC FUnder 100C (212F) 0.03 0.06100C (212F) to 190C (374F) 0.04 0.07Over 190C (374F) 0.04
35、 0.08AThis table is an approximation based on the Sydney Young equation, as follows:Cc= 0.000095 (760 P) (273 tc)where:Cc= correction to be added to the observed temperature, tc, andP = actual barometric pressure in millimetres of mercury.The corresponding equation for the correction of a Fahrenheit temperaturemeasuring instrument is as follows:Cf= 0.000095 (760 P) (460 tf) where:Cf= correction to be added to the observed temperature, tf.BTo be added in case barometric pressure is below 760 mm; to be subtracted incase barometric pressure is above 760 mm.D1120 163
