ASTM G131-96(2002)

Standard Practice for Cleaning of Materials and Components by Ultrasonic Techniques

SIGNIFICANCE AND USE
This practice is suitable for the removal of contaminants found on materials, parts, and components used in systems requiring a high level of cleanliness, such as oxygen. Parts shall have been precleaned to remove visible contaminants prior to using this procedure. Softgoods such as seals and valve seats may be cleaned without precleaning.
This procedure may also be used as the cleanliness verification technique for coupons used during cleaning effectiveness tests as in Test Method G 122.
The cleaning efficiency has been shown to vary with the frequency and power density of the ultrasonic unit. Low frequencies in the 20 to 25 kilohertz range have been found to damage soft metals such as aluminum and silver. Therefore, the specifications of the unit and the frequencies available must be considered in order to optimize the cleaning conditions without damaging the parts.
SCOPE
1.1 This practice covers a procedure for the cleaning of materials and components used in systems requiring a high level of cleanliness, such as oxygen, by ultrasonic techniques.
1.2 This practice may be used for cleaning small parts, components, softgoods, etc.
1.3 The values stated in SI units are standard.
1.4 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. Specific precautionary statements are given in Note 1.

General Information

• Status: Historical
• Publication Date: 09-Mar-1996
• ICS: 03.080.10 - Maintenance services. Facilities management
• Technical Committee: G04 - Compatibility and Sensitivity of Materials in Oxygen Enriched Atmospheres
• Drafting Committee: G04.02 - Recommended Practices

Relations

• Replaces: ASTM G131-96 - Standard Practice for Cleaning of Materials and Components by Ultrasonic Techniques
• Effective Date: 10-Mar-1996
• Replaced By: ASTM G131-96(2008) - Standard Practice for Cleaning of Materials and Components by Ultrasonic Techniques
• Effective Date: 01-Sep-2008
• Referred By: ASTM F2459-18 - Standard Test Method for Extracting Residue from Metallic Medical Components and Quantifying via Gravimetric Analysis
• Effective Date: 10-Mar-1996
• Referred By: ASTM F2847-17 - Standard Practice for Reporting and Assessment of Residues on Single-Use Implants and Single-Use Sterile Instruments
• Effective Date: 10-Mar-1996
• Referred By: ASTM G126-16(2023) - Standard Terminology Relating to the Compatibility and Sensitivity of Materials in Oxygen Enriched Atmospheres
• Effective Date: 10-Mar-1996
• Referred By: ASTM F3335-20 - Standard Guide for Assessing the Removal of Additive Manufacturing Residues in Medical Devices Fabricated by Powder Bed Fusion
• Effective Date: 10-Mar-1996
• Referred By: ASTM F3127-22 - Standard Guide for Validating Cleaning Processes Used During the Manufacture of Medical Devices
• Effective Date: 10-Mar-1996
• Referred By: ASTM G144-01(2022) - Standard Test Method for Determination of Residual Contamination of Materials and Components by Total Carbon Analysis Using a High Temperature Combustion Analyzer
• Effective Date: 10-Mar-1996
• Referred By: ASTM G93/G93M-19 - Standard Guide for Cleanliness Levels and Cleaning Methods for Materials and Equipment Used in Oxygen-Enriched Environments
• Effective Date: 10-Mar-1996

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:G131–96 (Reapproved 2002)
Standard Practice for
Cleaning of Materials and Components by Ultrasonic
1
Techniques
This standard is issued under the fixed designation G 131; 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 3. Terminology
1.1 This practice covers a procedure for the cleaning of 3.1 Definitions of Terms Specific to This Standard:
materials and components used in systems requiring a high 3.1.1 contaminant (contamination), n—unwantedmolecular
level of cleanliness, such as oxygen, by ultrasonic techniques. and particulate matter that could affect or degrade the perfor-
1.2 This practice may be used for cleaning small parts, mance of the components upon which they reside.
components, softgoods, etc. 3.1.2 contaminate, v—a process of applying a contaminant.
1.3 The values stated in SI units are standard. 3.1.3 control coupon (witness coupon), n—a coupon made
1.4 This standard does not purport to address all of the from the same material and prepared in exactly the same way
safety concerns, if any, associated with its use. It is the as the test coupons, which is used to verify the validity of the
responsibility of the user of this standard to establish appro- method or part thereof.
priate safety and health practices and determine the applica- 3.1.3.1 Discussion—Inthispractice,thecontrolcouponwill
bility of regulatory limitations prior to use. Specific precau- be contaminated in the same manner as the test coupons and
tionary statements are given in Note 1. will be subjected to the identical cleaning procedure.
3.1.4 degas, v—the process of removing gases from a
2. Referenced Documents
liquid.
2.1 ASTM Standards: 3.1.5 nonvolatile residue (NVR), n—residual molecular and
2
D 1193 Specification for Reagent Water
particulate matter remaining following the filtration and con-
E 1235 Practices for Gravimetric Determination of Non- trolled evaporation of a solvent containing contaminants.
volatile Residue (NVR) in Environmentally Controlled
3.1.6 particle (particulate contaminant), n—a piece of mat-
3
Areas for Spacecraft
terinasolidstatewithobservablelength,width,andthickness.
F 311 PracticeforProcessingAerospaceLiquidSamplesfor 3.1.6.1 Discussion—The size of a particle is usually defined
Particulate Contamination Analysis Using Membrane Fil-
by its greatest dimension and is specified in micrometres.
4
ters
4. Summary of Practice
F 324 Test Method for Nonvolatile Residue of Volatile
4
Cleaning Solvents Using the Solvent Purity Meter 4.1 A part, material or component is placed in a container
F 331 Test Method for Nonvolatile Residue of Halogenated containing the cleaning agent. This container is then placed in
Solvent Extract from Aerospace Components (Using Ro- an ultrasonic cleaner and treated for a given period of time at
4
tary Flash Evaporator) the recommended temperature for the cleaning agent. This
G 121 Practice for the Preparation of Contaminated Cou- results in a solution if the contaminant is soluble in the test
5
pons for the Evaluation of Cleaning Agents fluid or a emulsion if the contaminant is not soluble in the test
G 122 Test Method to Evaluate the Effectiveness of Clean- fluid. The cleaning solution combined with the rinse solutions
5
ing Agents may then be analyzed for particulate, NVR, or total carbon
(TC).
4.1.1 In the case of aqueous based agents, the parts are
1
This practice is under the jurisdiction of ASTM Committee G4 on Compat-
rinsed after the removal from the cleaning bath and ultrasoni-
ibility and Sensitivity of Materials in Oxygen Enriched Atmospheres and is the
direct responsibility of Subcommittee G04.02 on Recommended Practices.
cally cleaned in reagent water to provide a solution for TC
Current edition approved March 10, 1996. Published August 1996. Originally
analysis using G TC.
published as G 131 – 95. Last previous edition G 131 – 95.
2 4.1.2 Inthecaseofsolventbasedagents,thepartsarerinsed
Annual Book of ASTM Standards, Vol 11.01.
3
Annual Book of ASTM Standards, Vol 15.03. with fresh solvent, which is collected and combined with the
4
Annual Book of ASTM Standards, Vol 10.05.
solvent used in the cleaning process, and the NVR determined
5
Annual Book of ASTM Standards, Vol 14.02.
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G131–96 (2002)
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using Practice E 1235, Test Method F 324, or Test Method such specifications are available. Other grades may be used,
F 331, as appropriate. provided it is first ascertained that the
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