ASTM D1287-09
(Test Method)Standard Test Method for pH of Engine Coolants and Antirusts
Standard Test Method for pH of Engine Coolants and Antirusts
SIGNIFICANCE AND USE
pH is a measure of the hydrogen ion concentration and indicates whether an engine coolant, antirust, or a solution of these compounds is acidic, alkaline, or neutral.
The pH range includes values from 0 to 14. Values from 0 to 7 represent the acidic half of the scale. Values from 7 to 14 represent the alkaline or basic half of the scale. The pH value 7 is considered neutral, as it is neither acidic nor alkaline.
pH is sometimes used for production quality control. It is generally desirable that engine coolants have an alkaline pH.
pH is not significant from the standpoint of predicting service life. The pH of used engine coolants or antirust solutions is not a dependable indication of either existing effectiveness or remaining life of the solution.
SCOPE
1.1 This test method covers the determination of the pH of unused engine coolants and antirusts, and used or unused aqueous dilutions of the concentrated products.
Note 1—Antirusts in solid form are not included in this test method.
Note 2—It is believed that this procedure gives all the information required for determining the pH of samples of engine coolant or antirust likely to be encountered. Should additional information on pH determinations be needed, reference should be made to Test Method E70.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D1287–09
Standard Test Method for
1
pH of Engine Coolants and Antirusts
This standard is issued under the fixed designation D1287; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) 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 4. Significance and Use
1.1 This test method covers the determination of the pH of 4.1 pH is a measure of the hydrogen ion concentration and
unused engine coolants and antirusts, and used or unused indicates whether an engine coolant, antirust, or a solution of
aqueous dilutions of the concentrated products. these compounds is acidic, alkaline, or neutral.
4.2 ThepHrangeincludesvaluesfrom0to14.Valuesfrom
NOTE 1—Antirusts in solid form are not included in this test method.
0to7representtheacidichalfofthescale.Valuesfrom7to14
NOTE 2—It is believed that this procedure gives all the information
represent the alkaline or basic half of the scale. The pH value
required for determining the pH of samples of engine coolant or antirust
7 is considered neutral, as it is neither acidic nor alkaline.
likely to be encountered. Should additional information on pH determi-
nations be needed, reference should be made to Test Method E70.
4.3 pH is sometimes used for production quality control. It
isgenerallydesirablethatenginecoolantshaveanalkalinepH.
1.2 This standard does not purport to address all of the
4.4 pH is not significant from the standpoint of predicting
safety concerns, if any, associated with its use. It is the
service life. The pH of used engine coolants or antirust
responsibility of the user of this standard to establish appro-
solutions is not a dependable indication of either existing
priate safety and health practices and determine the applica-
effectiveness or remaining life of the solution.
bility of regulatory limitations prior to use.
5. Apparatus
2. Referenced Documents
2
5.1 The pH meter, glass electrode, and calomel electrode,
2.1 ASTM Standards:
shall be as specified in the Annex.
D1176 Practice for Sampling and PreparingAqueous Solu-
tions of Engine Coolants orAntirusts forTesting Purposes
NOTE 4—In pH operation, the meter may be set up to perform one-,
E70 Test Method for pH of Aqueous Solutions With the
two-oruptofive-pointstandardizationsormaybesetuptoautomatically
Glass Electrode recognize U.S. standard (pH 4, 7 and 10) buffers, NIST/International (pH
1.68, 4.01, 6.86, 9.18 and 12.46) buffers, or a custom user-centered set of
3. Summary of Test Method buffers, or both.
3.1 Asample, as received or after dilution with a specified
6. Reagents
volume of distilled water, is placed in a beaker or sample cup
6.1 Purity of Reagents—Reagent grade chemicals shall be
and the pH measured with a pH meter and combination
used in all tests. Unless otherwise indicated, it is intended that
electrode or associated glass-saturated calomel electrode pair.
all reagents shall conform to the specifications of the Commit-
NOTE 3—The readings of the meter in the case of the concentrated
tee onAnalytical Reagents of theAmerican Chemical Society,
products are not pH values according to the accepted definition, but are
3
where such specifications are available. Other grades may be
apparent pH values which are useful in the interpretation of the condition
used, provided it is first ascertained that the reagent is of
of the product.
sufficiently high purity to permit its use without lessening the
accuracy of the determination.
1
6.2 Purity of Water—Unlessotherwiseindicated,references
This test method is under the jurisdiction ofASTM Committee D15 on Engine
Coolants and is the direct responsibility of Subcommittee D15.04 on Chemical
towatershallbeunderstoodtomeandistilledwaterorwaterof
Properties.
Current edition approved Nov. 1, 2009. Published December 2009. Originally
3
approved in 1953 as D1287–53T. Last previous edition approved in 2002 as Reagent Chemicals, American Chemical Society Specifications , American
D1287–91(02). DOI: 10.1520/D1287-09. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
the ASTM website. MD.
Copyright © ASTM International, 100 Barr Harbor D
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D1287–91 (Reapproved 2002) Designation: D1287 – 09
Standard Test Method for
1
pH of Engine Coolants and Antirusts
This standard is issued under the fixed designation D1287; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) 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
1.1 This test method covers the determination of the pH of unused engine coolants and antirusts, and used or unused aqueous
dilutions of the concentrated products.
NOTE 1—Antirusts in solid form are not included in this test method.
NOTE 2—It is believed that this procedure gives all the information required for determining the pH of samples of engine coolant or antirust likely to
be encountered. Should additional information on pH determinations be needed, reference should be made to Test Method E70.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D1176 Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing Purposes
E70 Test Method for pH of Aqueous Solutions With the Glass Electrode
3. Summary of Test Method
3.1 Asample, as received or after dilution with a specified volume of distilled water, is placed in a beaker or sample cup and
the pH measured with a pH meter and combination electrode or associated glass-saturated calomel electrode pair.
NOTE 3—The readings of the meter in the case of the concentrated products are not pH values according to the accepted definition, but are apparent
pH values which are useful in the interpretation of the condition of the product.
4. Significance and Use
4.1 pH is a measure of the hydrogen ion concentration and indicates whether an engine coolant, antirust, or a solution of these
compounds is acidic, alkaline, or neutral.
4.2pH is sometimes used for production quality control. It is generally desirable that engine coolants have an alkaline pH.
4.3pH is not significant from the standpoint of predicting service life. The pH of used engine coolants or antirust solutions is
not a dependable indication of either existing effectiveness or remaining life of the solution.
4.2 The pH range includes values from 0 to 14. Values from 0 to 7 represent the acidic half of the scale. Values from 7 to 14
represent the alkaline or basic half of the scale. The pH value 7 is considered neutral, as it is neither acidic nor alkaline.
4.3 pH is sometimes used for production quality control. It is generally desirable that engine coolants have an alkaline pH.
4.4 pH is not significant from the standpoint of predicting service life. The pH of used engine coolants or antirust solutions is
not a dependable indication of either existing effectiveness or remaining life of the solution.
5. Apparatus
5.1 The pH meter, glass electrode, and calomel electrode, shall be as specified in the Annex.
NOTE 4—InpHoperation,themetermaybesetuptoperformone-,two-oruptofive-pointstandardizationsormaybesetuptoautomaticallyrecognize
U.S.standard(pH4,7and10)buffers,NIST/International(pH1.68,4.01,6.86,9.18and12.46)buffers,oracustomuser-centeredsetofbuffers,orboth.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD15onEngineCoolantsandisthedirectresponsibilityofSubcommitteeD15.04onChemicalProperties.
Current edition approved June 15, 1991. Published October 1991. Originally published as D1287–53T. Last previous edition D1287–85. DOI: 10.1520/D1287-91R02.
Current edition approved Nov. 1, 2009. Published December 2009. Originally approved in 1953 as D1287–53T. Last previous edition approved in 2002 as
D1287–91(02). DOI: 10.1520/D1287-09.
2
Annual Book of ASTM Standards, Vol 15.05.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D1287 – 09
6. Reagents
6.1 Pu
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