ASTM D4725-06
(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.
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:D4725–06
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 boiling point, n—the temperature at which the vapor pressure
of an engine coolant reaches atmospheric pressure under
1.1 This document covers terminology relating to engine
equilibrium boiling conditions.
coolants. It is intended to provide a reference for anyone
cavitation corrosion, n—a form of localized, accelerated
seeking information on engine coolants, and also to provide a
corrosion characterized by deep pitting and caused by high
uniform set of definitions for use in preparing ASTM specifi-
mechanical forces resulting from coolant vapor bubble
cations, test methods and other standard documents.
collapse at the surface of the metal.
1.2 This standard does not purport to address all of the
cavitation erosion corrosion, n—the mechanical removal of
safety concerns, if any, associated with its use. It is the
protective films on metal by the formation and collapse of
responsibility of the user of this standard to establish appro-
vapor bubbles in a liquid,and the abrasive action of a liquid,
priate safety and health practices and determine the applica-
which may contain suspended solids, moving at high veloc-
bility of regulatory limitations prior to use.
ity.
2. Referenced Documents
DISCUSSION—Themechanicalremovaloftheprotectivefilmsexposes
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2.1 ASTM Standards:
fresh metal to corrosive attack.
D 1193 Specification for Reagent Water
coolant additive package, n—the combination of inhibitors
D 3585 Specification for ASTM Reference Fluid for Cool-
added to an engine coolant to mitigate cooling system
ant Tests
degradation, corrosion, scaling, and foaming, or to provide
other desirable properties.
3. Terminology
corrosion inhibitor package, n—the combination of inhibi-
antifoam, n—a substance added to engine coolant concentrate,
tors added to an engine coolant to mitigate cooling system
corrosion inhibitor packages, or supplemental coolant addi-
corrosion.
tives to prevent or suppress foam.
corrosive water, n—a standard solution containing 100 ppm
each of sulfate, chloride, and bicarbonate ions introduced as
DISCUSSION—Eliminating foam improves heat transfer.
the sodium salts to distilled water.
antifreeze, n—a term frequently used in the marketplace for
dye, n—a colorant added to an engine coolant to give it a
engine coolant concentrate. (See engine coolant concen-
distinctive color.
trate.)
engine coolant, n—a fluid used to transfer heat from an engine
antirust, n—an inhibitor package, solid or liquid, intended to
to the radiator, usually containing specific amounts of
be diluted with water or glycol for use in an engine cooling
glycols, water, corrosion inhibitors, and a foam supressor.
system to mitigate rust and corrosion.
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
intended to be diluted with water for use in engine cooling
systems.
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This terminology is under the jurisdiction ofASTM Committee D15 on Engine
DISCUSSION—Functionally, the product provides a lower freeze point
Coolants and is the direct responsibility of Subcommittee D15.92 on Terminology.
and mitigates corrosion and foaming.
Current edition approved June 1, 2006. Published June 2006. Originally
approved in 1987. Last previous edition approved in 2004 as D 4725 – 04.
engine dynamometer test, n—a laboratory full-scale engine
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
test designed to evaluate corrosion protection and inhibitor
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
stability of engine coolants under simulated operational
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. conditions.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4725–06
DISCUSSION—Examples of inhibitors are corrosion inhibitors, foam
erosion corrosion, n—nonuniform, accelerated corrosion
inhibitors, and scale inhibitors
characterized by a smooth appearance and caused by high-
velocity coolant.
light-duty, adj— in internal combustion engine operation,
characterized by average speeds, power output, and inte
...
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