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75.120 - Hydraulic fluids

ICS 75.120 Details

Hydraulic fluids

Hydraulikfluide

Fluides hydrauliques

Hidravlični fluidi

General Information

Parent
75 - PETROLEUM AND RELATED TECHNOLOGIES

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Standardization Organization
Technical Committee
Directive
Mandate
50
ISO
ISO 7745:2024(Main)
Hydraulic fluid power — Fire-resistant fluids — Requirements and guidelines for use

This document specifies the operational characteristics for the various categories of fire-resistant fluids defined by ISO 6743-4. It includes requirements and guidelines for use of these fluids and specifies the factors to consider when selecting a fluid from these categories for a proposed application. This document identifies difficulties which can arise from the use of such fluids and indicates how they can be minimized. Procedures are given for replacing one fluid with another from a different category. Health and safety aspects when handling and disposing of fire-resistant fluids are also covered. This document does not apply to fire-resistant fluids used in the hydraulic systems of commercial or military aircraft.

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ISO
ISO 11158:2023(Main)
Lubricants, industrial oils and related products (class L) — Family H (hydraulic systems) — Specifications for categories HH, HL, HM, HV and HG

This document specifies the minimum requirements for new mineral oil hydraulic fluids and is intended for hydraulic systems, particularly for hydrostatic hydraulic fluid power application. The purpose of this document is to guide suppliers and end users of mineral oil hydraulic fluids and to direct equipment manufacturers of hydraulic systems. This document is written in a general form so that its application can accommodate various climatic conditions. This document also stipulates the requirements for mineral-oil hydraulic fluids at the time of delivery. This document is intended to be used in conjunction with ISO 6743-4, which classifies fluids used in hydraulic applications. Among the categories covered by ISO 6743-4, only five types of mineral oil-based fluids are covered in this document. These categories are HH, HL, HM, HV and HG. This document does not cover the extreme cases of use in terms of hydraulic circuits design, temperature and extreme conditions. NOTE For use in exceptional conditions, suppliers and purchasers of lubricants can mutually agree upon additional testing methods and acceptability criteria of the products. .

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SIST
SIST ISO 4406:2022(Main)
Hydraulic fluid power - Fluids - Method for coding the level of contamination by solid particles
ISO 4406:2021

This document specifies the code to be used in defining the quantity of solid particles in the fluid used in a given hydraulic fluid power system.

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ISO
ISO 4406:2021(Main)
Hydraulic fluid power — Fluids — Method for coding the level of contamination by solid particles
SIST ISO 4406:2022

This document specifies the code to be used in defining the quantity of solid particles in the fluid used in a given hydraulic fluid power system.

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CEN
EN ISO 12922:2020(Main)
Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) - Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (ISO 12922:2020)
SIST EN ISO 12922:2020

This document specifies the minimum requirements of unused fire-resistant and less flammable hydraulic fluids for hydrostatic and hydrodynamic systems in general industrial applications. It is not intended for use in aerospace or power-generation applications, where different requirements apply. It provides guidance for suppliers and end users of these less hazardous fluids and to the manufacturers of hydraulic equipment in which they are used.
Of the categories covered by ISO 6743-4, which classifies the different types of fluids used in hydraulic applications, only the following are detailed in this document: HFAE, HFAS, HFB, HFC, HFDR and HFDU.
Types HFAE, HFAS, HFB, HFC and HFDR are "fire-resistant" fluids as defined by ISO 5598. Most HFDU fluids, while displaying an improvement in combustion behaviour over mineral oil, fall outside this definition and are more appropriately considered as "less flammable" fluids.

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ISO
ISO 4926:2020(Main)
Road vehicles — Hydraulic braking systems — Non-petroleum-based reference fluid

This document specifies the composition and characteristics of a reference fluid used for the compatibility testing of hydraulic braking systems and components mounted on road vehicles.

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ISO
ISO 4925:2020(Main)
Road vehicles — Specification of non-petroleum-based brake fluids for hydraulic systems

This document provides the specifications, requirements and test methods, for non-petroleum-based fluids used in road-vehicle hydraulic brake and clutch systems that are designed for use with such fluids and equipped with seals, cups or double-lipped type gland seals made of styrene-butadiene rubber (SBR) and ethylene-propylene elastomer (EPDM).

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SIST
SIST EN ISO 12922:2020(Main)
Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) - Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (ISO 12922:2020)
EN ISO 12922:2020

EN-ISO 12922 specifies the minimum requirements of unused fire-resistant and less flammable hydraulic fluids for hydrostatic and hydrodynamic systems in general industrial applications. It is not intended for use in aerospace or power-generation applications, where different requirements apply. It provides guidance for suppliers and end users of these less hazardous fluids and to the manufacturers of hydraulic equipment in which they are used.Of the categories covered by ISO 6743-4, which classifies the different types of fluids used in hydraulic applications, only the following are detailed in this document: HFAE, HFAS, HFB, HFC, HFDR and HFDU.Types HFAE, HFAS, HFB, HFC and HFDR are "fire-resistant" fluids as defined by ISO 5598. Most HFDU fluids, while displaying an improvement in combustion behaviour over mineral oil, fall outside this definition and are more appropriately considered as "less flammable" fluids.

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ISO
ISO 12922:2020(Main)
Lubricants, industrial oils and related products (class L) — Family H (hydraulic systems) — Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and HFDU

This document specifies the minimum requirements of unused fire-resistant and less flammable hydraulic fluids for hydrostatic and hydrodynamic systems in general industrial applications. It is not intended for use in aerospace or power-generation applications, where different requirements apply. It provides guidance for suppliers and end users of these less hazardous fluids and to the manufacturers of hydraulic equipment in which they are used. Of the categories covered by ISO 6743-4, which classifies the different types of fluids used in hydraulic applications, only the following are detailed in this document: HFAE, HFAS, HFB, HFC, HFDR and HFDU. Types HFAE, HFAS, HFB, HFC and HFDR are "fire-resistant" fluids as defined by ISO 5598. Most HFDU fluids, while displaying an improvement in combustion behaviour over mineral oil, fall outside this definition and are more appropriately considered as "less flammable" fluids.

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ISO
ISO 11365:2017(Main)
Petroleum and related products — Requirements and guidance for the maintenance of triaryl phosphate ester turbine control fluids

ISO 11365:2017 is applicable to the use of triaryl phosphate esters as fire-resistant fluids for turbine control and other hydraulic systems in power generation. These fluids fall under category HFDR of ISO 6743‑4[1]. ISO 11365:2017 is intended to: - assist the power equipment operator to maintain the fluid in a condition that will ensure the safe and reliable operation of the turbine while maximizing fluid life; - recommend procedures for examining consignments of new fluid and monitoring the fluid in use; - provide information on the safe handling, storage and disposal of the fluid; - offer background information on the causes of fluid degradation.

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CEN
EN ISO 4263-3:2015(Main)
Petroleum and related products - Determination of the ageing behaviour of inhibited oils and fluids using the TOST test - Part 3: Anhydrous procedure for synthetic hydraulic fluids (ISO 4263-3:2015)
SIST EN ISO 4263-3:2016

ISO 4263-3:2015 specifies a method for the determination of the ageing behaviour of synthetic hydraulic fluids of categories HFDU, HEES, HEPG and HETG as defined, for example, in ISO 12922[1] and ISO 15380[2]. The ageing is accelerated by the presence of oxygen and metal catalysts at elevated temperature, and the degradation of the fluid is followed by changes in acid number. Other parts of ISO 4263 specify similar procedures for the determination of ageing behaviour of mineral oils and specified categories of fire-resistant fluids used in hydraulic and other applications.
NOTE          Other signs of fluid deterioration, such as the formation of insoluble sludge, catalyst coil corrosion or change in viscosity, can occur which indicate oxidation of the fluid, but are not reflected in the calculated oxidation lifetime. The correlation of these occurrences with field service is under investigation. This test method may be used to compare the oxidation stability of fluids that are not prone to contamination with water. However, because of the large number of individual field-service applications, the correlation between the results of this test and actual service performance can vary markedly, and is best judged on experience. The precision of this test method for synthetic hydraulic fluids is not known because interlaboratory data are not available. This method might not be suitable for use in specifications or in the event of disputed results as long as these data are not available.

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CEN
EN ISO 6743-4:2015(Main)
Lubricants, industrial oils and related products (class L) - Classification - Part 4: Family H (Hydraulic systems) (ISO 6743-4:2015)
SIST EN ISO 6743-4:2015

ISO 6743-4:2015 establishes the detailed classification of fluids of Family H (Hydraulic systems) which belong to class L (Lubricants, industrial oils, and related products). It is intended to be read in conjunction with ISO 6743‑99. This classification system does not include automotive brake fluids or aircraft hydraulic fluids.

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SIST
SIST EN ISO 4263-3:2016(Main)
Petroleum and related products - Determination of the ageing behaviour of inhibited oils and fluids using the TOST test - Part 3: Anhydrous procedure for synthetic hydraulic fluids (ISO 4263-3:2015)
EN ISO 4263-3:2015

This part of ISO 4263 specifies a method for the determination of the ageing behaviour of synthetic
hydraulic fluids of categories HFDU, HEES, HEPG and HETG as defined, for example, in ISO 12922[1]
and ISO 15380[2]. The ageing is accelerated by the presence of oxygen and metal catalysts at elevated
temperature, and the degradation of the fluid is followed by changes in acid number. Other parts of
ISO 4263 specify similar procedures for the determination of ageing behaviour of mineral oils and
specified categories of fire-resistant fluids used in hydraulic and other applications.
NOTE Other signs of fluid deterioration, such as the formation of insoluble sludge, catalyst coil corrosion
or change in viscosity, can occur which indicate oxidation of the fluid, but are not reflected in the calculated
oxidation lifetime. The correlation of these occurrences with field service is under investigation. This test
method may be used to compare the oxidation stability of fluids that are not prone to contamination with water.
However, because of the large number of individual field-service applications, the correlation between the results
of this test and actual service performance can vary markedly, and is best judged on experience. The precision of
this test method for synthetic hydraulic fluids is not known because interlaboratory data are not available. This
method might not be suitable for use in specifications or in the event of disputed results as long as these data are
not available.

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ISO
ISO 4263-3:2015(Main)
Petroleum and related products — Determination of the ageing behaviour of inhibited oils and fluids using the TOST test — Part 3: Anhydrous procedure for synthetic hydraulic fluids

ISO 4263-3:2015 specifies a method for the determination of the ageing behaviour of synthetic hydraulic fluids of categories HFDU, HEES, HEPG and HETG as defined, for example, in ISO 12922[1] and ISO 15380[2]. The ageing is accelerated by the presence of oxygen and metal catalysts at elevated temperature, and the degradation of the fluid is followed by changes in acid number. Other parts of ISO 4263 specify similar procedures for the determination of ageing behaviour of mineral oils and specified categories of fire-resistant fluids used in hydraulic and other applications. NOTE Other signs of fluid deterioration, such as the formation of insoluble sludge, catalyst coil corrosion or change in viscosity, can occur which indicate oxidation of the fluid, but are not reflected in the calculated oxidation lifetime. The correlation of these occurrences with field service is under investigation. This test method may be used to compare the oxidation stability of fluids that are not prone to contamination with water. However, because of the large number of individual field-service applications, the correlation between the results of this test and actual service performance can vary markedly, and is best judged on experience. The precision of this test method for synthetic hydraulic fluids is not known because interlaboratory data are not available. This method might not be suitable for use in specifications or in the event of disputed results as long as these data are not available.

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ISO
ISO 6743-4:2015(Main)
Lubricants, industrial oils and related products (class L) — Classification — Part 4: Family H (Hydraulic systems)

ISO 6743-4:2015 establishes the detailed classification of fluids of Family H (Hydraulic systems) which belong to class L (Lubricants, industrial oils, and related products). It is intended to be read in conjunction with ISO 6743‑99. This classification system does not include automotive brake fluids or aircraft hydraulic fluids.

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CEN
EN ISO 4404-1:2012(Main)
Petroleum and related products - Determination of the corrosion resistance of fire-resistant hydraulic fluids - Part 1: Water-containing fluids (ISO 4404-1:2012)
SIST EN ISO 4404-1:2012

ISO 4404-1:2012 specifies a test method to determine the influence on metals of fire-resistant fluids in categories HFA, HFB and HFC, as classified in ISO 6743-4. ISO 4404-1:2012 evaluates the corrosion protection provided by these fluids towards metal components used in hydraulic systems and installations.

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SIST
SIST EN ISO 4404-1:2012(Main)
Petroleum and related products - Determination of the corrosion resistance of fire-resistant hydraulic fluids - Part 1: Watercontaining fluids (ISO 4404-1:2012)
EN ISO 4404-1:2012

This part of ISO 4404 specifies a test method to determine the influence on metals of fire-resistant fluids in categories HFA, HFB and HFC, as classified in ISO 6743-4. It evaluates the corrosion protection provided by these fluids towards metal components used in hydraulic systems and installations. A similar technique for fluids in category HFD is described in ISO 4404-2.

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ISO
ISO 4404-1:2012(Main)
Petroleum and related products — Determination of the corrosion resistance of fire-resistant hydraulic fluids — Part 1: Water-containing fluids

ISO 4404-1:2012 specifies a test method to determine the influence on metals of fire-resistant fluids in categories HFA, HFB and HFC, as classified in ISO 6743-4. ISO 4404-1:2012 evaluates the corrosion protection provided by these fluids towards metal components used in hydraulic systems and installations.

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CEN
CEN/TR 16227:2011(Main)
Liquid petroleum products - Bio-lubricants - Recommendation for terminology and characterisation of bio-lubricants and bio-based lubricants
SIST-TP CEN/TR 16227:2011

This Technical Report gives information about bio-lubricants and recommendations for bio-lubricant (and bio-based lubricant) related terminology. These recommendations are based on a discussion of commonly used terms in this field.
This Technical Report also briefly describes the current test methods in relation to the characterization of bio-lubricants. It presents recommendation for related standards in the field of biodegradability, product functionality, impact on greenhouse gas emissions and te amount of different renewable raw materials an/or different biobased contents used during manufacturing of such bio-lubricants forming one product group.
The criteria of the European Ecolabel for Lubricants ("EEL") [2] includes the terms discussed in this paper.
NOTE 1   The European Lead Market Initiative ("LMI") [3] defines the term "bio-based" as described in Table 1. It is important to mention that "bio-based" does not imply "biodegradable". In addition, "biodegradable" does not imply the use of "bio-based" material.
NOTE 2   For the purposes of this European Technical Report, the term "% (m/m)" is used to represent the mass fraction.

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CEN
EN ISO 20783-1:2011(Main)
Petroleum and related products - Determination of emulsion stability of fire-resistant fluids - Part 1: Fluids in category HFAE (ISO 20783-1:2011)
SIST EN ISO 20783-1:2011

ISO 20783‑1:2011 specifies a test method to assess the stability of emulsions within the category HFAE, as defined in ISO 6743-4, made up with waters having clearly-defined concentrations of salts. This method is applicable only to HFAE fluids and not to HFAS fluids.

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CEN
EN ISO 20843:2011(Main)
Petroleum and related products - Determination of pH of fire-resistant fluids within categories HFAE, HFAS and HFC (ISO 20843:2011)
SIST EN ISO 20843:2011

ISO 20843:2011 specifies a test method to determine the pH value of fire-resistant fluids within categories HFAE, HFAS and HFC, as classified in ISO 6743‑4.

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IEC
IEC TS 61994-3:2011(Main)
Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection - Glossary - Part 3: Piezoelectric and dielectric oscillators

IEC/TS 61994-3:2011(E) specifies the terms and definitions for piezoelectric dielectric oscillators representing the state-of-the-art, which are intended for use in the standards and documents of IEC TC 49.

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CEN
EN ISO 4404-2:2010(Main)
Petroleum and related products - Determination of the corrosion resistance of fire-resistant hydraulic fluids - Part 2: Non-aqueous fluids (ISO 4404-2:2010)
SIST EN ISO 4404-2:2011

ISO 4404-2:2010 specifies a procedure for the determination of the corrosion-inhibiting properties of non-aqueous hydraulic fluids within the category HFD, as classified in ISO 6743‑4.
It provides a qualitative assessment of corrosion of five of the most common metals used in the construction of hydraulic systems, but other metals and/or alloys could be added or substituted for these metals for particular installations.

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SIST
SIST EN ISO 4404-2:2011(Main)
Petroleum and related products - Determination of the corrosion resistance of fire-resistant hydraulic fluids - Part 2: Non-aqueous fluids (ISO 4404-2:2010)
EN ISO 4404-2:2010

This part of ISO 4404 specifies a procedure for the determination of the corrosion-inhibiting properties of non-aqueous hydraulic fluids within the category HFD, as classified in ISO 6743-4. It provides a qualitative assessment of corrosion of five of the most common metals used in the construction of hydraulic systems, but other metals and/or alloys could be added or substituted for these metals for particular installations.

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ISO
ISO 20843:2011(Main)
Petroleum and related products — Determination of pH of fire-resistant fluids within categories HFAE, HFAS and HFC

ISO 20843:2011 specifies a test method to determine the pH value of fire-resistant fluids within categories HFAE, HFAS and HFC, as classified in ISO 6743‑4.

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ISO
ISO 20783-1:2011(Main)
Petroleum and related products — Determination of emulsion stability of fire-resistant fluids — Part 1: Fluids in category HFAE

ISO 20783‑1:2011 specifies a test method to assess the stability of emulsions within the category HFAE, as defined in ISO 6743-4, made up with waters having clearly-defined concentrations of salts. This method is applicable only to HFAE fluids and not to HFAS fluids.

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ISO
ISO 4404-2:2010(Main)
Petroleum and related products — Determination of the corrosion resistance of fire-resistant hydraulic fluids — Part 2: Non-aqueous fluids

ISO 4404-2:2010 specifies a procedure for the determination of the corrosion-inhibiting properties of non-aqueous hydraulic fluids within the category HFD, as classified in ISO 6743‑4. It provides a qualitative assessment of corrosion of five of the most common metals used in the construction of hydraulic systems, but other metals and/or alloys could be added or substituted for these metals for particular installations.

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ISO
ISO 9128:2006(Main)
Road vehicles — Graphical symbols to designate brake fluid types

ISO 9128:2006 specifies the graphical symbols and colours used to identify, on road vehicles, the correct type of fluid to be used for: petroleum-base brake fluid systems; and non-petroleum-base brake fluid systems.

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SIST
SIST-TP CEN/TR 14489:2006(Main)
Fire-resistant hydraulic fluids - Classification and specification - Guidelines on selection for the protection of safety, health and the environment
CEN/TR 14489:2005

This Technical Report gives guidance on the achievement of compliance with Essential Health and Safety Requirements (EHSR) by the selection of fire-resistant fluids or by other means. It includes consideration of the selection of fluids with lower levels of fire resistance and of mineral oil, with appropriate additional safety measures, where this option may be considered to be most satisfactory during operation.
This Technical Report is concerned with assessing the fire resistance, health properties and effects on the environment, but does not cover requirements for their general physical and chemical properties, which are detailed in EN ISO 12922.

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CEN
CEN/TR 14489:2005(Main)
Fire-resistant hydraulic fluids - Classification and specification - Guidelines on selection for the protection of safety, health and the environment
SIST-TP CEN/TR 14489:2006

This Technical Report gives guidance on the achievement of compliance with Essential Health and Safety Requirements (EHSR) by the selection of fire-resistant fluids or by other means. It includes consideration of the selection of fluids with lower levels of fire resistance and of mineral oil, with appropriate additional safety measures, where this option may be considered to be most satisfactory during operation.
This Technical Report is concerned with assessing the fire resistance, health properties and effects on the environment, but does not cover requirements for their general physical and chemical properties, which are detailed in EN ISO 12922.

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ISO
ISO 10050:2005(Main)
Lubricants, industrial oils and related products (class L) — Family T (Turbines) — Specifications of triaryl phosphate ester turbine control fluids (category ISO-L-TCD)

ISO 10050:2005 specifies the characteristics of unused triaryl phosphate ester fluids for turbine governor controls and other hydraulic systems in electrical power stations.

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CEN
EN ISO 20763:2004(Main)
Petroleum and related products - Determination of anti-wear properties of hydraulic fluids - Vane pump method (ISO 20763:2004)
SIST EN ISO 20763:2004

ISO 20763:2004 specifies procedures for the determination of steel-on-steel anti-wear properties of hydraulic fluids by means of performance in a vane-type hydraulic pump. ISO 20763:2004 covers a range of hydraulic fluids, both anhydrous and aqueous, intended for applications where high-speed sliding contacts, such as those found in a vane pump, are encountered.
For mineral oils of categories HM and HV, and fire-resistant fluids of category HFD, the method is applicable to viscosity classes ISO VG 32, ISO VG 46 and ISO VG 68, as specified in ISO 3448. Under different specified conditions, the method is applicable to aqueous fire-resistant hydraulic fluids in categories HFA, HFB and HFC, as specified in ISO 12922, within the same viscosity classes.

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SIST
SIST EN ISO 20763:2004(Main)
Petroleum and related products - Determination of anti-wear properties of hydraulic fluids - Vane pump method (ISO 20763:2004)
EN ISO 20763:2004

ISO 20763:2004 specifies procedures for the determination of steel-on-steel anti-wear properties of hydraulic fluids by means of performance in a vane-type hydraulic pump. ISO 20763:2004 covers a range of hydraulic fluids, both anhydrous and aqueous, intended for applications where high-speed sliding contacts, such as those found in a vane pump, are encountered.
For mineral oils of categories HM and HV, and fire-resistant fluids of category HFD, the method is applicable to viscosity classes ISO VG 32, ISO VG 46 and ISO VG 68, as specified in ISO 3448. Under different specified conditions, the method is applicable to aqueous fire-resistant hydraulic fluids in categories HFA, HFB and HFC, as specified in ISO 12922, within the same viscosity classes.

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ISO
ISO 20763:2004(Main)
Petroleum and related products — Determination of anti-wear properties of hydraulic fluids — Vane pump method

ISO 20763:2004 specifies procedures for the determination of steel-on-steel anti-wear properties of hydraulic fluids by means of performance in a vane-type hydraulic pump. ISO 20763:2004 covers a range of hydraulic fluids, both anhydrous and aqueous, intended for applications where high-speed sliding contacts, such as those found in a vane pump, are encountered. For mineral oils of categories HM and HV, and fire-resistant fluids of category HFD, the method is applicable to viscosity classes ISO VG 32, ISO VG 46 and ISO VG 68, as specified in ISO 3448. Under different specified conditions, the method is applicable to aqueous fire-resistant hydraulic fluids in categories HFA, HFB and HFC, as specified in ISO 12922, within the same viscosity classes.

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CEN
EN ISO 20783-2:2003(Main)
Petroleum and related products - Determination of emulsion stability of fire-resistant fluids - Part 2: Fluids in category HFB (ISO 20783-2:2003)
SIST EN ISO 20783-2:2004

ISO 20783-2:2003 specifies three test methods to assess the stability of emulsions within the category HFB, as defined in ISO 6743-4.
Method A describes a method for the determination of stability during storage at ambient temperature [(20 ± 2) °C] and is applicable to HFB and HFB.LT fluids.
Method B describes a method for the determination of stability during storage at medium temperature [(70 ± 2) °C] and is again applicable to HFB and HFB.LT fluids.
Method C describes a method for the determination of stability during storage at low temperature [(-10 ± 2) °C] and is applicable only to HFB.LT fluids.

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ISO
ISO 20783-2:2003(Main)
Petroleum and related products — Determination of emulsion stability of fire-resistant fluids — Part 2: Fluids in category HFB

ISO 20783-2:2003 specifies three test methods to assess the stability of emulsions within the category HFB, as defined in ISO 6743-4. Method A describes a method for the determination of stability during storage at ambient temperature [(20 ± 2) °C] and is applicable to HFB and HFB.LT fluids. Method B describes a method for the determination of stability during storage at medium temperature [(70 ± 2) °C] and is again applicable to HFB and HFB.LT fluids. Method C describes a method for the determination of stability during storage at low temperature [(-10 ± 2) °C] and is applicable only to HFB.LT fluids.

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CEN
EN ISO 4263-2:2003(Main)
Petroleum and related products - Determination of the ageing behaviour of inhibited oils and fluids - TOST test - Part 2: Procedure for category HFC hydraulic fluids (ISO 4263-2:2003)
SIST EN ISO 4263-2:2003

ISO 4263-2:2003 specifies a method for the determination of the ageing behaviour of hydraulic fluids of category HFC as defined in ISO 6743-4 and specified in ISO 12922. The ageing is accelerated by the presence of oxygen, water and metal catalysts at elevated temperature, and the degradation of the fluid is followed by changes in pH value and insolubles content. Other parts of ISO 4263 specify similar procedures for the determination of the ageing behaviour of mineral oils and specified categories of fire-resistant fluids used in hydraulic and other applications.

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SIST
SIST EN ISO 4263-2:2003(Main)
Petroleum and related products - Determination of the ageing behaviour of inhibited oils and fluids - TOST test - Part 2: Procedure for category HFC hydraulic fluids (ISO 4263-2:2003)
EN ISO 4263-2:2003

ISO 4263-2:2003 specifies a method for the determination of the ageing behaviour of hydraulic fluids of category HFC as defined in ISO 6743-4 and specified in ISO 12922. The ageing is accelerated by the presence of oxygen, water and metal catalysts at elevated temperature, and the degradation of the fluid is followed by changes in pH value and insolubles content. Other parts of ISO 4263 specify similar procedures for the determination of the ageing behaviour of mineral oils and specified categories of fire-resistant fluids used in hydraulic and other applications.

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ISO
ISO 4263-2:2003(Main)
Petroleum and related products — Determination of the ageing behaviour of inhibited oils and fluids — TOST test — Part 2: Procedure for category HFC hydraulic fluids

ISO 4263-2:2003 specifies a method for the determination of the ageing behaviour of hydraulic fluids of category HFC as defined in ISO 6743-4 and specified in ISO 12922. The ageing is accelerated by the presence of oxygen, water and metal catalysts at elevated temperature, and the degradation of the fluid is followed by changes in pH value and insolubles content. Other parts of ISO 4263 specify similar procedures for the determination of the ageing behaviour of mineral oils and specified categories of fire-resistant fluids used in hydraulic and other applications.

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ISO
ISO 3871:2000(Main)
Road vehicles — Labelling of containers for petroleum-based or non-petroleum-based brake fluid

This International Standard specifies the minimum labelling required for commercial containers of petroleum- and non-petroleum-based fluids used in the braking and hydraulic systems of road vehicles, including mopeds and motorcycles.

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ISO
ISO 7308:1987(Main)
Road vehicles — Petroleum-based brake-fluid for stored-energy hydraulic brakes

The brake-fluid specified is for use in road vehicle brake systems equipped with rubber cups and seals (butadiene-acrylonitrile copolymer or equivalent). It is for use in hydraulic brake systems equipped with a pump; it may also be used in other systems without a pump. Not for use under arctic conditions.

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ISO
ISO 7309:1985(Main)
Road vehicles — Hydraulic braking systems — ISO reference petroleum base fluid

Specifies the composition (table 1) and required characteristics (table 2) of a reference fluid used for the testing of hydraulic braking systems and components mounted on road vehicles. Tabulates the physical and chemical characteristics together with units and values and the method of determination to be used.

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ISO
ISO 10050(Main)
Lubricants, industrial oils and related products (class L) — Family T (Turbines) — Specifications of triaryl phosphate ester turbine control fluids (category ISO-L-TCD)

This document specifies the characteristics of unused triaryl phosphate ester fluids for turbine governor controls and other hydraulic systems in electrical power stations. Fluids used in this application are classified under category TCD of ISO 6743-5.

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SIST
SIST EN ISO 12922:2013(Main)
Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) - Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (ISO 12922:2012)
EN ISO 12922:2012

This International Standard specifies the minimum requirements of unused fire-resistant and less-flammable hydraulic fluids for hydrostatic and hydrodynamic systems in general industrial applications. It is not intended for use in aerospace or power-generation applications, where different requirements apply. It provides guidance for suppliers and end users of these less hazardous fluids and to the manufacturers of hydraulic equipment in which they are used. Of the categories covered by ISO 6743-4, which classifies the different types of fluids used in hydraulic applications, only the following are detailed in this International Standard: HFAE, HFAS, HFB, HFC, HFDR and HFDU. Types HFAE, HFAS, HFB, HFC and HFDR are “fire-resistant” fluids as defined by ISO 5598. Most HFDU fluids, while displaying an improvement in combustion behaviour over mineral oil, fall outside this definition and are more appropriately considered “less-flammable” fluids.

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CEN
EN ISO 12922:2012(Main)
Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) - Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (ISO 12922:2012)
SIST EN ISO 12922:2013

ISO 12922:2012 specifies the minimum requirements of unused fire-resistant and less-flammable hydraulic fluids for hydrostatic and hydrodynamic systems in general industrial applications. It is not intended for use in aerospace or power-generation applications, where different requirements apply. It provides guidance for suppliers and end users of these less hazardous fluids and to the manufacturers of hydraulic equipment in which they are used.
Of the categories covered by ISO 6743-4, which classifies the different types of fluids used in hydraulic applications, only the following are detailed in this International Standard: HFAE, HFAS, HFB, HFC, HFDR and HFDU.

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SIST
SIST ISO 4406:2001(Main)
Hydraulic fluid power -- Fluids -- Method for coding the level of contamination by solid particles
ISO 4406:1999
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ISO
ISO 4406:2017(Main)
Hydraulic fluid power — Fluids — Method for coding the level of contamination by solid particles

ISO 4406:2017 specifies the code to be used in defining the quantity of solid particles in the fluid used in a given hydraulic fluid power system.

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SIST
SIST EN ISO 4263-3:2010(Main)
Petroleum and related products - Determination of the ageing behaviour of inhibited oils and fluids using the TOST test - Part 3: Anhydrous procedure for synthetic hydraulic fluids (ISO 4263- 3:2010)
EN ISO 4263-3:2010

This part of ISO 4263 specifies a method for the determination of the ageing behaviour of synthetic hydraulic fluids of categories HFDR, HFDU, HEES and HEPG as defined, for example, in ISO 12922 and ISO 15380. The ageing is accelerated by the presence of oxygen and metal catalysts at elevated temperature, and the degradation of the fluid is followed by changes in acid number. Other parts of ISO 4263 specify similar procedures for the determination of ageing behaviour of mineral oils and specified categories of fire-resistant fluids used in hydraulic and other applications. This test method can be used to compare the oxidation stability of fluids that are not prone to contamination with water. However, because of the large number of individual field-service applications, the correlation between the results of this test and actual service performance can vary markedly, and is best judged on experience. The precision of this test method for synthetic hydraulic fluids is not known because interlaboratory data are not available. This method might not be suitable for use in specifications or in the event of disputed results as long as these data are not available. However, precision for inhibited turbine oils is given in Clause 11 for guidance as an indication of the precision that could be obtained for synthetic hydraulic fluids.

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CEN
EN ISO 4263-3:2010(Main)
Petroleum and related products - Determination of the ageing behaviour of inhibited oils and fluids using the TOST test - Part 3: Anhydrous procedure for synthetic hydraulic fluids (ISO 4263-3:2010)
SIST EN ISO 4263-3:2010

ISO 4263-3:2010 specifies a method for the determination of the ageing behaviour of synthetic hydraulic fluids of categories HFDR, HFDU, HEES and HEPG as defined e.g. in ISO 12922 and ISO 15380. The ageing is accelerated by the presence of oxygen and metal catalysts at elevated temperature, and the degradation of the fluid is followed by changes in acid number. Other parts of ISO 4263 specify similar procedures for the determination of ageing behaviour of mineral oils and specified categories of fire-resistant fluids used in hydraulic and other applications.
Other signs of fluid deterioration, such as the formation of insoluble sludge, catalyst coil corrosion or decrease in viscosity, can occur, which indicate oxidation of the fluid, but are not reflected in the calculated oxidation lifetime. The correlation of these occurrences with field service is under investigation.
ISO 4263-3:2010 can be used to compare the oxidation stability of fluids that are not prone to contamination with water. However, because of the large number of individual field-service applications, the correlation between the results of ISO 4263-3:2010 and actual service performance can vary markedly, and is best judged on experience.
The precision of ISO 4263-3:2010 for synthetic hydraulic fluids is not known because interlaboratory data are not available. ISO 4263-3:2010 might not be suitable for use in specifications or in the event of disputed results as long as these data are not available. However, precision for inhibited turbine oils is given for guidance as an indication of the precision that could be obtained for synthetic hydraulic fluids.

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CEN
EN ISO 6743-4:2001(Main)
Lubricants, industrial oils and related products (class L) - Classification - Part 4: Family H (Hydraulic systems) (ISO 6743-4:1999)
SIST EN ISO 6743-4:2002

Migrated from Progress Sheet (TC Comment) (2000-07-10): BTC235/1998: UAP on ISO 6743-4 when available (TA/990104) ++ new TC forecast in BP Bli 991022 ++  New TC forecasts in rev BP (NT/01-01-02)

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