ASTM D4725-04
(Terminology)Standard Terminology for Engine Coolants
Standard Terminology for Engine Coolants
SCOPE
1.1 This document covers terminology relating to engine coolants. It is intended to provide a reference for anyone seeking information on engine coolants, and also to provide a uniform set of definitions for use in preparing ASTM specifications, test methods and other standard documents.
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:D4725–04
Standard Terminology for
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Engine Coolants
This standard is issued under the fixed designation D 4725; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope cavitation corrosion, n—a form of localized, accelerated
corrosion characterized by deep pitting and caused by high
1.1 This document covers terminology relating to engine
mechanical forces resulting from coolant vapor bubble
coolants. It is intended to provide a reference for anyone
collapse at the surface of the metal.
seeking information on engine coolants, and also to provide a
cavitation erosion corrosion, n—the mechanical removal of
uniform set of definitions for use in preparing ASTM specifi-
protective films on metal by the formation and collapse of
cations, test methods and other standard documents.
vapor bubbles in a liquid,and the abrasive action of a liquid,
1.2 This standard does not purport to address all of the
which may contain suspended solids, moving at high veloc-
safety concerns, if any, associated with its use. It is the
ity.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
DISCUSSION—Themechanicalremovaloftheprotectivefilmsexposes
bility of regulatory limitations prior to use. fresh metal to corrosive attack.
coolant additive package, n—the combination of inhibitors
2. Referenced Documents
added to an engine coolant to mitigate cooling system
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2.1 ASTM Standards:
degradation, corrosion, scaling, and foaming, or to provide
D 1193 Specification for Reagent Water
other desirable properties.
D 3585 Specification for ASTM Reference Fluid for Cool-
corrosion inhibitor package, n—the combination of inhibi-
ant Tests
tors added to an engine coolant to mitigate cooling system
corrosion.
3. Terminology
corrosive water, n—a standard solution containing 100 ppm
antifoam, n—a substance added to engine coolant concentrate,
each of sulfate, chloride, and bicarbonate ions introduced as
corrosion inhibitor packages, or supplemental coolant addi-
the sodium salts to distilled water.
tives to prevent or suppress foam.
dye, n—a colorant added to an engine coolant to give it a
distinctive color.
DISCUSSION—Eliminating foam improves heat transfer.
engine coolant, n—a fluid used to transfer heat from an engine
antifreeze, n—a term frequently used in the marketplace for
to the radiator, usually containing specific amounts of
engine coolant concentrate. (See engine coolant concen-
glycols, water, corrosion inhibitors, and a foam supressor.
trate.)
DISCUSSION—Engine coolants may also contain supplemental coolant
ash content, n—the residue from an engine coolant concen-
additives.
trate, antirust, or engine coolant that remains after evapora-
tion, charring, and ignition at strong heat.
engine coolant concentrate, n—a formulated liquid product
boiling point, n—the temperature at which the vapor pressure
intended to be diluted with water for use in engine cooling
of an engine coolant reaches atmospheric pressure under
systems.
equilibrium boiling conditions.
DISCUSSION—Functionally, the product provides a lower freeze point
and mitigates corrosion and foaming.
engine dynamometer test, n—a laboratory full-scale engine
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This terminology is under the jurisdiction ofASTM Committee D15 on Engine
test designed to evaluate corrosion protection and inhibitor
Coolants and is the direct responsibility of Subcommittee D15.92 on Terminology.
stability of engine coolants under simulated operational
Current edition approved May 1, 2004. Published June 2004. Originally
approved in 1987. Last previous edition approved in 1998 as D 4725 – 98.
conditions.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
erosion corrosion, n—nonuniform, accelerated corrosion
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
characterized by a smooth appearance and caused by high-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. velocity coolant.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4725–04
DISCUSSION—The corrosive attack may be aggravated by suspended
liner pitting, n—cavities that develop on the coolant side of
solids.
cast iron cylinder liners as a result of cavitation corrosion.
extended life coolant, n—an engine coolant for light-duty
DISCUSSION—This predominantly occurs on the thrust side of heavy-
service vehicles with recommended change-out of the coo
...
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