ASTM G131

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.

1. 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.

2. Referenced Documents

ASTM Standards
D1193 Specification for Reagent Water
E1235 Test Method for Gravimetric Determination of Nonvolatile Residue (NVR) in Environmentally Controlled Areas for Spacecraft
F311 Practice for Processing Aerospace Liquid Samples for Particulate Contamination Analysis Using Membrane Filters
F324 Test Method for Nonvolatile Residue of Volatile Cleaning Solvents Using the Solvent Purity Meter
F331 Test Method for Nonvolatile Residue of Solvent Extract from Aerospace Components (Using Flash Evaporator)
G121 Practice for Preparation of Contaminated Test Coupons for the Evaluation of Cleaning Agents
G122 Test Method for Evaluating the Effectiveness of Cleaning Agents

Index Terms

cleaning; contamination; contaminant; nonvolatile residue; NVR; oxygen systems; TC; total carbon; ultrasonic cleaning; Cleaning agents/processes; Contamination--systems (materials/applications); Nonvolatile residue (NVR); Oxygen-enriched systems/environments; Total carbon (TC); Ultrasonic cleaning; ICS Number Code 03.080.10 (Industrial services)

Citing ASTM Standards

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