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ASTM D8385-22

(Test Method)

Standard Test Method for Dry Filterability of Lubricants and Hydraulic Fluids by Mass Flow Technique

Standard Test Method for Dry Filterability of Lubricants and Hydraulic Fluids by Mass Flow Technique

SIGNIFICANCE AND USE
5.1 Precision equipment and high pressure hydraulic machinery require filtered lubricants and fluids to prevent damage from the circulation of hard particulate contaminants. Three types of particulate contaminants are present in lubricants and hydraulic fluids: built in contaminants from the machinery assembly process, generated contaminants from equipment wear, and contaminants that enter from external sources.  
5.2 The ability of lubricants and hydraulic fluids to retain their filterability is critical for efficient and reliable machine performance. Normally, the pressure differential across a filter will increase gradually as the filter accumulates dirt, sludge, and wear debris. In order to prevent the filter from collapsing, bypass valves in the filter assembly open when the differential pressure gets too high. If a filter becomes blocked by precipitating additives or other contaminants, the bypass valve will open. This can lead to an equipment shutdown or circulation of damaging particles throughout the machine.
SCOPE
1.1 This test method covers determination of the dry filterability of lubricants and hydraulic fluids based upon mass flow rate measurements through a 0.8 µm membrane after ageing (Note 1). The procedure applies to lubricants and hydraulic fluids that are formulated with American Petroleum Institute (API) Group I, II, III, IV, and certain V base stocks. Products formulated with water or base stocks that are heavier than water are out of scope.
Note 1: This test method is similar to ISO 13357 but differs from the ISO method in the manner by which filterability is assessed. In ISO 13357, volume flow rates are used to determine filterability. In this test method, mass flow rates are used. Measurements of filterability based on mass flow rates facilitate automation and can be less susceptible to operator error.
Note 2: Residual water due to atmospheric conditions or contaminants is in scope for these samples and it is typically low for most in process samples.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 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.  
1.4 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-Jun-2022
ICS
75.100 - Lubricants, industrial oils and related products
75.120 - Hydraulic fluids
Technical Committee
D02 - Petroleum Products, Liquid Fuels, and Lubricants
Drafting Committee
D02.N0 - Hydraulic Fluids
Current Stage
Ref Project

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ASTM D8385-22 - Standard Test Method for Dry Filterability of Lubricants and Hydraulic Fluids by Mass Flow TechniqueASTM D8385-22 - Standard Test Method for Dry Filterability of Lubricants and Hydraulic Fluids by Mass Flow Technique
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ASTM D8385-22 - Standard Test Method for Dry Filterability of Lubricants and Hydraulic Fluids by Mass Flow Technique
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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: D8385 − 22
Standard Test Method for
Dry Filterability of Lubricants and Hydraulic Fluids by Mass
1
Flow Technique
This standard is issued under the fixed designation D8385; 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 D4057 Practice for Manual Sampling of Petroleum and
Petroleum Products
1.1 This test method covers determination of the dry filter-
D4175 Terminology Relating to Petroleum Products, Liquid
ability of lubricants and hydraulic fluids based upon mass flow
Fuels, and Lubricants
rate measurements through a 0.8 µm membrane after ageing
D6300 Practice for Determination of Precision and Bias
(Note 1). The procedure applies to lubricants and hydraulic
Data for Use in Test Methods for Petroleum Products,
fluids that are formulated with American Petroleum Institute
Liquid Fuels, and Lubricants
(API) Group I, II, III, IV, and certain V base stocks. Products
3
2.2 ISO Standards:
formulated with water or base stocks that are heavier than
ISO 13357 Petroleum products – Determination of the fil-
water are out of scope.
terability of lubricating oils – Part 2: Procedure for dry
NOTE 1—This test method is similar to ISO 13357 but differs from the
oils
ISOmethodinthemannerbywhichfilterabilityisassessed.InISO13357,
ISO 16889 Hydraulic fluid power – Filters – Multi-pass
volume flow rates are used to determine filterability. In this test method,
massflowratesareused.Measurementsoffilterabilitybasedonmassflow method for evaluating filtration performance of a filter
rates facilitate automation and can be less susceptible to operator error.
element
NOTE2—Residualwaterduetoatmosphericconditionsorcontaminants
is in scope for these samples and it is typically low for most in process
3. Terminology
samples.
3.1 Definitions:
1.2 The values stated in SI units are to be regarded as
3.1.1 For definitions of terms used in this test method, refer
standard. No other units of measurement are included in this
to Terminology D4175.
standard.
3.2 Definitions of Terms Specific to This Standard:
1.3 This standard does not purport to address all of the
3.2.1 filterability, n—the ability of lubricants and hydraulic
safety concerns, if any, associated with its use. It is the
fluids to pass through fine filters without plugging them; it is a
responsibility of the user of this standard to establish appro-
dimensionless number that is the ratio between two filtration
priate safety, health, and environmental practices and deter-
rates.
mine the applicability of regulatory limitations prior to use.
3.2.2 Stage I filterability index, n—the ratio, expressed as a
1.4 This international standard was developed in accor-
percentage, between 192 g and the mass of oil filtered in the
dance with internationally recognized principles on standard-
time that 192 g would have theoretically taken, assuming no
ization established in the Decision on Principles for the
plugging of the membrane.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3.2.3 Stage II filterability index, n—the ratio, expressed as a
Barriers to Trade (TBT) Committee.
percentage, between the flow rate near the start of filtration,
and the flow rate between 160 g and 240 g of filtered mass.
2. Referenced Documents
2
NOTE 3—Oils having good Stage I filterability would be unlikely to
2.1 ASTM Standards:
cause filter performance problems in use, unless high efficiency fine
D1193 Specification for Reagent Water
filtration is employed in the equipment. Oils with good Stage II filterabil-
ity would be unlikely to cause filtration problems when high efficiency
1
This test method is under the jurisdiction of ASTM Committee D02 on
fine filtration is present. High efficiency filters, within the context of this
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
method, have a Beta Ratio greater than or equal to 75 at 5 µm as defined
Subcommittee D02.N0 on Hydraulic Fluids.
byISO16889.(β ≥75)ThusfluidsthathavegoodStageIIfilterability
5µm
Current edition approved July 1, 2022. Published August 2022. DOI: 10.1520/
D8385-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from International Organization for Standardization (ISO), ISO
Standards volume information, refer to the standard’s Document Summary page on Central Secretariat, Chemin de Blan
...

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