Standard Classification of Industrial Fluid Lubricants by Viscosity System

ABSTRACT
This classification is applicable to all petroleum-base fluid lubricants and to those nonpetroleum materials which may be readily blended to produce fluid lubricants of a desired viscosity, that is, lubricants for bearings, gears, compressor cylinders, hydraulic fluids, etc. This classification is used to eliminate unjustified intermediate viscosities, thereby reducing the total number of viscosity grades used in the lubrication of industrial equipment. The lubricants shall be classified according to viscosity grades: ISO VG 2; ISO VG 3; ISO VG 5; ISO VG 7; ISO VG 10; ISO VG 15; ISO VG 22; ISO VG 32; ISO VG 46; ISO VG 68; ISO VG 100; ISO VG 150; ISO VG 220; ISO VG 320; ISO VG 460; ISO VG 680; ISO VG 1000; ISO VG 1500; ISO VG 2200; and ISO VG 3200.
SIGNIFICANCE AND USE
3.1 This classification establishes a series of definite viscosity levels so that lubricant suppliers, lubricant users, and equipment designers will have a uniform and common basis for designating, specifying, or selecting the viscosity of industrial fluid lubricants.  
3.2 This classification is used to eliminate unjustified intermediate viscosities, thereby reducing the total number of viscosity grades used in the lubrication of industrial equipment.  
3.3 This system provides a suitable number of viscosity grades, a uniform reference temperature, a uniform viscosity tolerance, and a nomenclature system for identifying the viscosity characteristics of each grade.  
3.4 This system implies no evaluation of lubricant quality and applies to no property of a fluid other than its viscosity at the reference temperature. It does not apply to those lubricants used primarily with automotive equipment and identified with an SAE number.
SCOPE
1.1 This classification is applicable to all petroleum-base fluid lubricants and to those nonpetroleum materials which may be readily blended to produce fluid lubricants of a desired viscosity, that is, lubricants for bearings, gears, compressor cylinders, hydraulic fluids, etc.  
1.2 This classification is applicable to fluids ranging in kinematic viscosity from 2 cSt to 3200 cSt (mm2/s) as measured at a reference temperature of 40 °C. In the category of petroleum-base fluids, this covers the range from kerosene to heavy cylinder oils.  
1.3 Fluids of either lesser or greater viscosity than the range described in 1.2 are, at present, seldom used as industrial lubricants. Should industrial practices change, then this system, based on a mathematical series of numbers, may be extended to retain its orderly progression.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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
30-Sep-2018

Relations

Effective Date
01-May-2020
Effective Date
01-May-2020
Effective Date
01-Jul-2017
Effective Date
01-Jun-2015
Effective Date
01-Oct-2009
Effective Date
01-Dec-2003
Effective Date
10-Apr-1998

Overview

ASTM D2422-97(2018): Standard Classification of Industrial Fluid Lubricants by Viscosity System is an international standard developed by ASTM International. This classification system covers both petroleum-based and selected non-petroleum materials suitable for blending into industrial fluid lubricants. It establishes a uniform series of viscosity grades for lubricants used in a range of industrial equipment, such as bearings, gears, compressor cylinders, and hydraulic fluids.

The primary goal is to eliminate unnecessary intermediate viscosities, providing a streamlined set of viscosity grades for use in industrial lubricant selection and specification, thus simplifying inventory, supply, and equipment design.

Key Topics

  • Applicability: Relevant to all petroleum-based fluid lubricants and nonpetroleum materials readily blended for targeted viscosities.
  • Viscosity Range: Covers fluids with kinematic viscosities from 2 cSt to 3200 cSt at 40°C, enabling classification from very light to very heavy lubricants.
  • Standardized Grades: Defines specific viscosity grades such as ISO VG 2, 3, 5, up to ISO VG 3200, each with standardized nominal viscosity and specified limits.
  • Uniform Reference Temperature: Viscosity is measured and specified at a uniform reference of 40°C, ensuring consistency in classification.
  • Tolerance and Nomenclature: Each grade has a clearly defined tolerance and a standard naming system (e.g., ISO VG 68).
  • Global Consistency: Developed in line with international standards principles for global applicability and trade facilitation.

Applications

The ASTM D2422 viscosity classification system is widely used in the industrial lubrication sector to:

  • Specify Lubricant Grades: Equipment manufacturers and designers can reference a standardized viscosity grade when specifying lubricants, reducing ambiguity.
  • Streamline Inventory: By eliminating unnecessary intermediate grades, users and suppliers reduce inventory complexity and improve supply chain efficiency.
  • Facilitate Equipment Design: Designers can ensure compatibility with globally recognized viscosity grades, promoting reliability and maintainability for industrial machinery.
  • Support Quality Control: The system defines viscosity-specific requirements but does not assess lubricant quality, leaving additional performance attributes to be managed by other standards.
  • Global Trade: Harmonizes lubricant specifications for international trade, ensuring that users and suppliers worldwide use common viscosity reference points.

Typical Uses

  • Lubricants for industrial bearings
  • Gear oils for heavy machinery and gearboxes
  • Compressor cylinder and crankcase lubricants
  • Hydraulic fluids for industrial systems

Related Standards

Several standards support or complement ASTM D2422-97(2018), ensuring complete and compatible viscosity classification:

  • ISO 3448: Industrial liquid lubricants - ISO viscosity classification: The basis for the viscosity grades used in ASTM D2422.
  • ASTM D341: Practice for Viscosity-Temperature Charts for Liquid Petroleum Products: Guidelines for correlating viscosity at different temperatures.
  • SAE J300: Engine Oil Viscosity Classification: Specifies viscosity grades for automotive, not industrial, fluids.
  • ISO VG System: Globally recognized nomenclature for lubricant viscosity grading used in industrial applications.

Practical Value

Adopting the ASTM D2422-97(2018) viscosity classification enables lubricant producers, equipment manufacturers, and end-users to communicate effectively regarding viscosity requirements. This leads to more precise lubricant specification, reduced operational risk, optimized maintenance practices, and better equipment performance. The standard’s alignment with international trade norms ensures broad acceptance and facilitates the global exchange of industrial lubricants.

Keywords: industrial lubricants, viscosity classification, ASTM D2422, ISO VG grades, lubricant specification, viscosity system, equipment lubrication, international standards, industrial oils

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Frequently Asked Questions

ASTM D2422-97(2018) is a standard published by ASTM International. Its full title is "Standard Classification of Industrial Fluid Lubricants by Viscosity System". This standard covers: ABSTRACT This classification is applicable to all petroleum-base fluid lubricants and to those nonpetroleum materials which may be readily blended to produce fluid lubricants of a desired viscosity, that is, lubricants for bearings, gears, compressor cylinders, hydraulic fluids, etc. This classification is used to eliminate unjustified intermediate viscosities, thereby reducing the total number of viscosity grades used in the lubrication of industrial equipment. The lubricants shall be classified according to viscosity grades: ISO VG 2; ISO VG 3; ISO VG 5; ISO VG 7; ISO VG 10; ISO VG 15; ISO VG 22; ISO VG 32; ISO VG 46; ISO VG 68; ISO VG 100; ISO VG 150; ISO VG 220; ISO VG 320; ISO VG 460; ISO VG 680; ISO VG 1000; ISO VG 1500; ISO VG 2200; and ISO VG 3200. SIGNIFICANCE AND USE 3.1 This classification establishes a series of definite viscosity levels so that lubricant suppliers, lubricant users, and equipment designers will have a uniform and common basis for designating, specifying, or selecting the viscosity of industrial fluid lubricants. 3.2 This classification is used to eliminate unjustified intermediate viscosities, thereby reducing the total number of viscosity grades used in the lubrication of industrial equipment. 3.3 This system provides a suitable number of viscosity grades, a uniform reference temperature, a uniform viscosity tolerance, and a nomenclature system for identifying the viscosity characteristics of each grade. 3.4 This system implies no evaluation of lubricant quality and applies to no property of a fluid other than its viscosity at the reference temperature. It does not apply to those lubricants used primarily with automotive equipment and identified with an SAE number. SCOPE 1.1 This classification is applicable to all petroleum-base fluid lubricants and to those nonpetroleum materials which may be readily blended to produce fluid lubricants of a desired viscosity, that is, lubricants for bearings, gears, compressor cylinders, hydraulic fluids, etc. 1.2 This classification is applicable to fluids ranging in kinematic viscosity from 2 cSt to 3200 cSt (mm2/s) as measured at a reference temperature of 40 °C. In the category of petroleum-base fluids, this covers the range from kerosene to heavy cylinder oils. 1.3 Fluids of either lesser or greater viscosity than the range described in 1.2 are, at present, seldom used as industrial lubricants. Should industrial practices change, then this system, based on a mathematical series of numbers, may be extended to retain its orderly progression. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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.

ABSTRACT This classification is applicable to all petroleum-base fluid lubricants and to those nonpetroleum materials which may be readily blended to produce fluid lubricants of a desired viscosity, that is, lubricants for bearings, gears, compressor cylinders, hydraulic fluids, etc. This classification is used to eliminate unjustified intermediate viscosities, thereby reducing the total number of viscosity grades used in the lubrication of industrial equipment. The lubricants shall be classified according to viscosity grades: ISO VG 2; ISO VG 3; ISO VG 5; ISO VG 7; ISO VG 10; ISO VG 15; ISO VG 22; ISO VG 32; ISO VG 46; ISO VG 68; ISO VG 100; ISO VG 150; ISO VG 220; ISO VG 320; ISO VG 460; ISO VG 680; ISO VG 1000; ISO VG 1500; ISO VG 2200; and ISO VG 3200. SIGNIFICANCE AND USE 3.1 This classification establishes a series of definite viscosity levels so that lubricant suppliers, lubricant users, and equipment designers will have a uniform and common basis for designating, specifying, or selecting the viscosity of industrial fluid lubricants. 3.2 This classification is used to eliminate unjustified intermediate viscosities, thereby reducing the total number of viscosity grades used in the lubrication of industrial equipment. 3.3 This system provides a suitable number of viscosity grades, a uniform reference temperature, a uniform viscosity tolerance, and a nomenclature system for identifying the viscosity characteristics of each grade. 3.4 This system implies no evaluation of lubricant quality and applies to no property of a fluid other than its viscosity at the reference temperature. It does not apply to those lubricants used primarily with automotive equipment and identified with an SAE number. SCOPE 1.1 This classification is applicable to all petroleum-base fluid lubricants and to those nonpetroleum materials which may be readily blended to produce fluid lubricants of a desired viscosity, that is, lubricants for bearings, gears, compressor cylinders, hydraulic fluids, etc. 1.2 This classification is applicable to fluids ranging in kinematic viscosity from 2 cSt to 3200 cSt (mm2/s) as measured at a reference temperature of 40 °C. In the category of petroleum-base fluids, this covers the range from kerosene to heavy cylinder oils. 1.3 Fluids of either lesser or greater viscosity than the range described in 1.2 are, at present, seldom used as industrial lubricants. Should industrial practices change, then this system, based on a mathematical series of numbers, may be extended to retain its orderly progression. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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.

ASTM D2422-97(2018) is classified under the following ICS (International Classification for Standards) categories: 75.100 - Lubricants, industrial oils and related products. The ICS classification helps identify the subject area and facilitates finding related standards.

ASTM D2422-97(2018) has the following relationships with other standards: It is inter standard links to ASTM D341-20e1, ASTM D341-20, ASTM D341-17, ASTM D341-09(2015), ASTM D341-09, ASTM D341-03, ASTM D341-93(1998). Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

ASTM D2422-97(2018) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

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: D2422 −97 (Reapproved 2018)
Standard Classification of
Industrial Fluid Lubricants by Viscosity System
This standard is issued under the fixed designation D2422; 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 2.2 SAE Standard:
J 300 Engine Oil Viscosity Classification
1.1 This classification is applicable to all petroleum-base
2.3 ISO Standard:
fluid lubricants and to those nonpetroleum materials which
ISO 3448 Industrial Liquid Lubricants—ISOViscosity Clas-
may be readily blended to produce fluid lubricants of a desired
sification
viscosity, that is, lubricants for bearings, gears, compressor
cylinders, hydraulic fluids, etc.
3. Significance and Use
1.2 This classification is applicable to fluids ranging in
3.1 This classification establishes a series of definite viscos-
kinematic viscosity from 2 cSt to 3200 cSt (mm /s) as mea-
ity levels so that lubricant suppliers, lubricant users, and
sured at a reference temperature of 40 °C. In the category of
equipmentdesignerswillhaveauniformandcommonbasisfor
petroleum-base fluids, this covers the range from kerosene to
designating, specifying, or selecting the viscosity of industrial
heavy cylinder oils.
fluid lubricants.
1.3 Fluids of either lesser or greater viscosity than the range
3.2 This classification is used to eliminate unjustified inter-
described in 1.2 are, at present, seldom used as industrial
mediate viscosities, thereby reducing the total number of
lubricants.Shouldindustrialpracticeschange,thenthissystem,
viscositygradesusedinthelubricationofindustrialequipment.
basedonamathematicalseriesofnumbers,maybeextendedto
3.3 This system provides a suitable number of viscosity
retain its orderly progression.
grades, a uniform reference temperature, a uniform viscosity
1.4 The values stated in SI units are to be regarded as
tolerance, and a nomenclature system for identifying the
standard. No other units of measurement are included in this
viscosity characteristics of each grade.
standard.
3.4 This system implies no evaluation of lubricant quality
1.5 This international standard was developed in accor-
and applies to no property of a fluid other than its viscosity at
dance with internationally recognized principles on standard-
the reference temperature. It does not apply to those lubricants
ization established in the Decision on Principles for the
used primarily with automotive equipment and identified with
Development of International Standards, Guides and Recom-
an SAE number.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
4. Basis of Classification
4.1 Twenty viscosity grades are given in Table 1.
2. Referenced Documents
4.2 Each grade shall be designated by its nominal viscosity
2.1 ASTM Standards:
at 40 °C.
D341 Practice for Viscosity-Temperature Charts for Liquid
Petroleum Products
4.3 Thepermissiblevarianceinviscosityofeachgradeshall
be as shown in the two right-hand columns of Table 1. These
limits are based upon a 610 % deviation from the mathemati-
cal values which were used as the basis of construction of this
system.
This classification is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricantsand is the direct responsibility of
4.4 The lubricant supplier may choose to exert a manufac-
Subcommittee D02.L0.11 on Tribological Properties of Industrial Fluids and
turing control on a given product that is closer than this 610 %
Lubricates.
tolerance. It is to be understood that any different percentage
Current edition approved Oct. 1, 2018. Published November 2018. Originally
approved in 1965. Last previous edition approved in 2013 as D2422 – 97 (2013).
DOI: 10.1520/D2422-97R18.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from SAE International (SAE), 400 Commonwealth Dr.,Warrendale,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM PA 15096-0001, http://www.sae.org.
Standards volume information, refer to the standard’s Document Sum
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