ASTM D7933-22

Standard Test Method for Engine Coolant Stagnation in Flux-Brazed Aluminum Heat Exchangers

SIGNIFICANCE AND USE
4.1 Automobile and truck radiators and heater cores are now predominantly made with aluminum alloys using various manufacturing processes including brazing with a flux (See Appendix X1 for additional information). The presence of residual internal brazing flux in heat exchangers along with the high ratio of internal aluminum surface area to coolant volume may affect certain physical and chemical properties and corrosion protection of the coolant. This test method provides a screening test to assess engine coolant physical and chemical properties and corrosion protection after aging it in a heat exchanger brazed with flux at elevated temperature under stagnant conditions. This method cannot stand alone as evidence of satisfactory coolant performance in flux-brazed aluminum heat exchangers. The actual service of an engine coolant formulation can be determined only by more comprehensive bench, dynamometer, and field tests.
SCOPE
1.1 This test method covers a laboratory screening procedure for evaluating engine coolant compatibility and corrosion protection after aging two weeks at 90 °C in an aluminum heat exchanger brazed using flux.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-May-2022
• ICS: 71.100.45 - Refrigerants and antifreezes
• Technical Committee: D15 - Engine Coolants and Related Fluids
• Drafting Committee: D15.21 - Extended Life Coolants

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7933 − 22
Standard Test Method for
Engine Coolant Stagnation in Flux-Brazed Aluminum Heat
1
Exchangers
This standard is issued under the fixed designation D7933; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope isfilledwithenginecoolant,plugged,andplacedinanovenfor
two weeks (336 h) at 90 °C. Engine coolant compatibility is
1.1 This test method covers a laboratory screening proce-
assessed based on changes in coolant physical and composi-
dure for evaluating engine coolant compatibility and corrosion
tional properties, and engine coolant aluminum corrosion
protection after aging two weeks at 90 °C in an aluminum heat
protection is based on performance in the Test Method D4340
exchanger brazed using flux.
test.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Significance and Use
standard.
4.1 Automobileandtruckradiatorsandheatercoresarenow
1.3 This standard does not purport to address all of the
predominantly made with aluminum alloys using various
safety concerns, if any, associated with its use. It is the
manufacturing processes including brazing with a flux (See
responsibility of the user of this standard to establish appro-
Appendix X1 for additional information). The presence of
priate safety, health, and environmental practices and deter-
residual internal brazing flux in heat exchangers along with the
mine the applicability of regulatory limitations prior to use.
high ratio of internal aluminum surface area to coolant volume
1.4 This international standard was developed in accor-
may affect certain physical and chemical properties and corro-
dance with internationally recognized principles on standard-
sion protection of the coolant. This test method provides a
ization established in the Decision on Principles for the
screening test to assess engine coolant physical and chemical
Development of International Standards, Guides and Recom-
properties and corrosion protection after aging it in a heat
mendations issued by the World Trade Organization Technical
exchanger brazed with flux at elevated temperature under
Barriers to Trade (TBT) Committee.
stagnant conditions. This method cannot stand alone as evi-
dence of satisfactory coolant performance in flux-brazed alu-
2. Referenced Documents
minum heat exchangers. The actual service of an engine
2
2.1 ASTM Standards:
coolant formulation can be determined only by more compre-
D1176 Practice for Sampling and Preparing Aqueous Solu-
hensive bench, dynamometer, and field tests.
tions of Engine Coolants orAntirusts forTesting Purposes
D1193 Specification for Reagent Water
5. Apparatus
D4340 Test Method for Corrosion of CastAluminumAlloys
5.1 Aluminum Heat Exchanger Brazed with Flux—The heat
in Engine Coolants Under Heat-Rejecting Conditions
exchanger may be a radiator, heater core, or other, liquid
E230/E230M Specification for Temperature-Electromotive
cooled heat exchanger.
Force (emf) Tables for Standardized Thermocouples
NOTE 1—The aluminum brazed heat exchangers used in this test
3. Summary of Test Method
method may be commercially produced or experimentally prepared by the
heat exchanger supplier. The aluminum grade, alloying, flux loading
3.1 An aluminum heat exchanger that was brazed using flux
during brazing, and residual flux remaining in the heat exchanger after
via any application method or as part of the material cladding
brazing may vary from part to part. The heat exchanger type,
manufacturer, size, and other design parameters are decided by mutual
1 agreement of the parties involved.
This test method is under the jurisdiction ofASTM Committee D15 on Engine
Coolants and Related Fluids and is the direct responsibility of Subcommittee
5.2 Coolant Hoses, Clamps, Hose Adapters, and Caps or
D15.21 on Extended Life Coolants.
Plugs—Rubber engine coolant hoses (approximately 15 cm
Current edition approved June 1, 2022. Published June 2022. Originally
length) of appropriate diameter shall be fitted onto heat
approved in 2015. Last previous edition approved in 2015 as D7933–15. DOI:
10.1520/D7933-22.
exchanger inlet/outlets to allow for coolant expansion. EPDM
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
is one type hose material suitable for the test. Metal clamps,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
hose adapters, and threaded caps or plugs (stai
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: D7933 − 15 D7933 − 22
Standard Test Method for
Engine Coolant Stagnation in Flux-Brazed Aluminum Heat
1
Exchangers
This standard is issued under the fixed designation D7933; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a laboratory screening procedure for evaluating engine coolant compatibility and corrosion protection
after aging two weeks at 90°C90 °C in an aluminum heat exchanger brazed using flux.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D1176 Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing Purposes
D1193 Specification for Reagent Water
D4340 Test Method for Corrosion of Cast Aluminum Alloys in Engine Coolants Under Heat-Rejecting Conditions
E230/E230M Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples
3. Summary of Test Method
3.1 An aluminum heat exchanger that was brazed using flux via any application method or as part of the material cladding is filled
with engine coolant, plugged, and placed in an oven for two weeks (336 h) at 90°C.90 °C. Engine coolant compatibility is assessed
based on changes in coolant physical and compositional properties, and engine coolant aluminum corrosion protection is based on
performance in the Test Method D4340 test.
4. Significance and Use
4.1 Automobile and truck radiators and heater cores are now predominantly made with aluminum alloys using various
1
This test method is under the jurisdiction of ASTM Committee D15 on Engine Coolants and Related Fluids and is the direct responsibility of Subcommittee D15.21 on
Extended Life Coolants.
Current edition approved May 1, 2015June 1, 2022. Published May 2015June 2022. Originally approved in 2015. Last previous edition approved in 2015 as D7933–15.
DOI: 10.1520/D7933-1510.1520/D7933-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’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
1

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D7933 − 22
manufacturing processes including brazing with a flux (See Appendix X1 for additional information). The presence of residual
internal brazing flux in heat exchangers along with the high ratio of internal aluminum surface area to coolant volume may affect
certain physical and chemical properties and corrosion protection of the coolant. This test method provides a screening test to
assess engine coolant physical and chemical properties and corrosion protection after aging it in a heat exchanger brazed with flux
at elevated temperature under stagnant conditions. This method cannot stand alone as evidence of satisfactory coolant performance
in flux-brazed aluminum heat exchangers. The actual service of an engine coolant formulation can be determined only by more
comprehensive bench, dynamometer, and field tests.
5. Apparatus
5.1 Aluminum Heat Exchanger Brazed with Flux—The heat exchanger may be a radiator, heater core, or other, liquid cooled heat
exchanger.
NOTE 1—The aluminum brazed heat exchangers used in this test method may be commercially produced or experimentally prepared by the heat exchanger
supplier. The aluminum grade, alloying, flux loading during brazing, and residual flux remaining in the heat exchanger after brazing may vary fr
...