ASTM D7752-18
(Practice)Standard Practice for Evaluating Compatibility of Mixtures of Hydraulic Fluids
Standard Practice for Evaluating Compatibility of Mixtures of Hydraulic Fluids
SIGNIFICANCE AND USE
5.1 Hydraulic fluid compatibility is important to hydraulic equipment users because a mixture of incompatible fluids may produce a substance that is markedly inferior to its constituents. Even in identical base stocks, the formation of a precipitate may occur as a result of additive interactions. In this practice, compatibility will be determined using ISO 13357-1 filterability test method. Since hydraulic systems utilize fine-filtration to protect components from wear, incompatibility often exhibits itself as premature filter plugging.
5.2 Because of such occurrences, suppliers recommend evaluating the compatibility of hydraulic fluids prior to mixing. A flowchart is provided in Annex A1 to aid in interpretation of the test results and hydraulic system conversion.
5.3 Although new hydraulic fluids may be compatible, in-service fluid of the same type may be degraded or contaminated to such an extent that the new fluid added may not be compatible with the system fluid. In-service fluid compatibility with new fluid additions should be evaluated on a case by case basis.
5.4 The oxidation resistance and wear protection of different fluids of the same type can vary widely, and compatibility does not imply equivalent performance.
SCOPE
1.1 This practice covers the compatibility of mixtures of hydraulic fluids as defined by Specifications D6158, DIN 51524, ISO 11158, and ISO 15380.
1.2 This practice can be used to evaluate new (unused) lubricant compatibility or the effects of combining new (replacement) lubricant with in-service (original) lubricant in the system.
1.3 To evaluate primary compatibility using this method, the replacement fluid must pass the ISO 13357-1 Stage II filterability test. The original fluid is not required to pass ISO 13357-1 filterability test, Stage I or II.
1.4 Primary testing is conducted on fluid mixtures in 2:98, 10:90, and 50:50 ratios using the ISO 13357-1 Filterability Test, Stage II.
1.5 Secondary testing is suggested when circumstances indicate the need for additional testing.
1.6 This practice does not evaluate the wear prevention characteristics, load carrying capacity, or the mechanical shear stability of lubricant mixtures while in service. If anti-wear (AW), extreme pressure (EP), or shear stability are to be evaluated, further testing of these parameters may be required.
1.7 This practice does not purport to cover all test methods that could be employed.
1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.9 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.
1.10 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.
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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: D7752 − 18
Standard Practice for
1
Evaluating Compatibility of Mixtures of Hydraulic Fluids
This standard is issued under the fixed designation D7752; 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* Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.1 This practice covers the compatibility of mixtures of
Barriers to Trade (TBT) Committee.
hydraulic fluids as defined by Specifications D6158, DIN
51524, ISO 11158, and ISO 15380.
2. Referenced Documents
1.2 This practice can be used to evaluate new (unused)
2
2.1 ASTM Standards:
lubricant compatibility or the effects of combining new (re-
D130 Test Method for Corrosiveness to Copper from Petro-
placement) lubricant with in-service (original) lubricant in the
leum Products by Copper Strip Test
system.
D445 Test Method for Kinematic Viscosity of Transparent
1.3 Toevaluateprimarycompatibilityusingthismethod,the
and Opaque Liquids (and Calculation of Dynamic Viscos-
replacement fluid must pass the ISO 13357-1 Stage II filter-
ity)
ability test. The original fluid is not required to pass ISO
D664 Test Method for Acid Number of Petroleum Products
13357-1 filterability test, Stage I or II.
by Potentiometric Titration
D665 Test Method for Rust-Preventing Characteristics of
1.4 Primary testing is conducted on fluid mixtures in 2:98,
Inhibited Mineral Oil in the Presence of Water
10:90, and 50:50 ratios using the ISO 13357-1 Filterability
D892 Test Method for Foaming Characteristics of Lubricat-
Test, Stage II.
ing Oils
1.5 Secondary testing is suggested when circumstances
D974 Test Method for Acid and Base Number by Color-
indicate the need for additional testing.
Indicator Titration
1.6 This practice does not evaluate the wear prevention
D1401 TestMethodforWaterSeparabilityofPetroleumOils
characteristics, load carrying capacity, or the mechanical shear
and Synthetic Fluids
stability of lubricant mixtures while in service. If anti-wear
D2270 Practice for Calculating Viscosity Index from Kine-
(AW), extreme pressure (EP), or shear stability are to be
matic Viscosity at 40 °C and 100 °C
evaluated, further testing of these parameters may be required.
D3427 Test Method forAir Release Properties of Hydrocar-
bon Based Oils
1.7 This practice does not purport to cover all test methods
D6158 Specification for Mineral Hydraulic Oils
that could be employed.
D7042 Test Method for Dynamic Viscosity and Density of
1.8 The values stated in SI units are to be regarded as
Liquids by Stabinger Viscometer (and the Calculation of
standard. No other units of measurement are included in this
Kinematic Viscosity)
standard.
3
2.2 ISO Standards:
1.9 This standard does not purport to address all of the
11158:2009 Lubricants, industrial oils and related products
safety concerns, if any, associated with its use. It is the
(class L)—Family H (hydraulic systems)—Specifications
responsibility of the user of this standard to establish appro-
for categories HH, HL, HM, HR, HV and HG
priate safety, health, and environmental practices and deter-
13357-1:2002(E) PetroleumProducts—Determinationofthe
mine the applicability of regulatory limitations prior to use.
filterability of lubricating oils—Part 1: Procedure for oils
1.10 This international standard was developed in accor-
in the presence of water
dance with internationally recognized principles on standard-
13357-2:2005(E) PetroleumProducts—Determinationofthe
ization established in the Decision on Principles for the
1 2
This practice is under the jurisdiction ofASTM Committee D02 on Petroleum For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom- contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
mittee D02.N0 on Hydraulic Fluids. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved March 1, 2018. Published March 2018. Originally the ASTM website.
3
approved in 2011. Last previous edition approved in 2011 as D7752 – 11. DOI: Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/D7752-18. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Un
...
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: D7752 − 11 D7752 − 18
Standard Practice for
1
Evaluating Compatibility of Mixtures of Hydraulic Fluids
This standard is issued under the fixed designation D7752; 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 Scope*
1.1 This practice covers the compatibility of mixtures of hydraulic fluids as defined by Specifications D6158, DIN 51524, ISO
11158, and ISO 15380.
1.2 This practice can be used to evaluate new (unused) lubricant compatibility or the effects of combining new (replacement)
lubricant with in-service (original) lubricant in the system.
1.3 To evaluate primary compatibility using this method, the replacement fluid must pass the ISO 13357-1 Stage II filterability
test. The original fluid is not required to pass ISO 13357-1 filterability test, Stage I or II.
1.4 Primary testing is conducted on fluid mixtures in 2:98, 10:90, and 50:50 ratios using the ISO 13357-1 Filterability Test,
Stage II.
1.5 Secondary testing is suggested when circumstances indicate the need for additional testing.
1.6 This practice does not evaluate the wear prevention characteristics, load carrying capacity, or the mechanical shear stability
of lubricant mixtures while in service. If anti-wear (AW), extreme pressure (EP), or shear stability are to be evaluated, further
testing of these parameters may be required.
1.7 This practice does not purport to cover all test methods that could be employed.
1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.9 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
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.N0 on Hydraulic Fluids.
Current edition approved Oct. 1, 2011March 1, 2018. Published November 2011March 2018. Originally approved in 2011. Last previous edition approved in 2011 as
D7752 – 11. DOI: 10.1520/D7752–11.10.1520/D7752-18.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7752 − 18
1.10 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:
D130 Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip Test
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration
D665 Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water
D892 Test Method for Foaming Characteristics of Lubricating Oils
D974 Test Method for Acid and Base Number by Color-Indicator Titration
D1401 Test Method for Water Separability of Petroleum Oils and Synthetic Fluids
D2270 Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 °C and 100 °C
D3427 Test Method for Air Release Properties of Hydrocarbon Based Oils
D6158 Specification for Mineral Hydraulic Oils
D7042 Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic
Viscosity)
3
2.2 ISO Standards:
11158:199711158:2009 Lubricants, industrial oils and related products (class L)—Family H (hydraulic systems)—Specifications
for categories HH, HL, HM, HR, HV and HG
13357-1:2002(E) Petroleum Products—Determination of the filterability of lubricating oils—Part 1: Procedure for oils in the
presence of water
13357-2:2005(E) Petroleum Products—Determination of the filterability of lubricating oils—Part 2: Procedure for dry oils
15380:200215380:2011 Lubricant
...
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