ASTM_G_131_-_96_2008.pdf

Designation:G13196(Reapproved 2008)Standard Practice forCleaning of Materials and Components by UltrasonicTechniques1This standard is issued under the fixed designation G131;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a procedure for the cleaning ofmaterials and components used in systems requiring a highlevel 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 thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in Note 1.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterE1235 Test Method for Gravimetric Determination of Non-volatile Residue(NVR)in Environmentally ControlledAreas for SpacecraftF311 Practice for Processing Aerospace Liquid Samples forParticulate Contamination Analysis Using Membrane Fil-tersF324 Test Method for Nonvolatile Residue of VolatileCleaning Solvents Using the Solvent Purity Meter(With-drawn 1987)3F331 Test Method for Nonvolatile Residue of Solvent Ex-tract from Aerospace Components(Using Flash Evapora-tor)G121 Practice for Preparation of Contaminated Test Cou-pons for the Evaluation of Cleaning AgentsG122 Test Method for Evaluating the Effectiveness ofCleaning Agents3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 contaminant(contamination),nunwanted molecularand particulate matter that could affect or degrade the perfor-mance of the components upon which they reside.3.1.2 contaminate,va process of applying a contaminant.3.1.3 control coupon(witness coupon),na coupon madefrom the same material and prepared in exactly the same wayas the test coupons,which is used to verify the validity of themethod or part thereof.3.1.3.1 DiscussionIn this practice,the control coupon willbe contaminated in the same manner as the test coupons andwill be subjected to the identical cleaning procedure.3.1.4 degas,vthe process of removing gases from a liquid.3.1.5 nonvolatile residue(NVR),nresidual molecular andparticulate matter remaining following the filtration and con-trolled evaporation of a solvent containing contaminants.3.1.6 particle(particulate contaminant),na piece of mat-ter in a solid state with observable length,width,and thickness.3.1.6.1 DiscussionThe size of a particle is usually definedby its greatest dimension and is specified in micrometres.4.Summary of Practice4.1 A part,material or component is placed in a containercontaining the cleaning agent.This container is then placed inan ultrasonic cleaner and treated for a given period of time atthe recommended temperature for the cleaning agent.Thisresults in a solution if the contaminant is soluble in the testfluid or a emulsion if the contaminant is not soluble in the testfluid.The cleaning solution combined with the rinse solutionsmay then be analyzed for particulate,NVR,or total carbon(TC).4.1.1 In the case of aqueous based agents,the parts arerinsed after the removal from the cleaning bath and ultrasoni-cally cleaned in reagent water to provide a solution for TCanalysis using G TC.1This practice is under the jurisdiction of ASTM Committee G04 on Compat-ibility and Sensitivity of Materials in Oxygen Enriched Atmospheres and is thedirect responsibility of Subcommittee G04.02 on Recommended Practices.Current edition approved Sept.1,2008.Published October 2008.Originallyapproved in 1995.Last previous edition approved in 2002 as G131 96(2002).DOI:10.1520/G0131-96R08.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.2 In the case of solvent based agents,the parts are rinsedwith fresh solvent,which is collected and combined with thesolvent used in the cleaning process,and the NVR determinedusing Test Method E1235,Test Method F324,or Test MethodF331,as appropriate.4.1.3 Particulate analyses may be performed by filtering thefinal cleaning solution.The particles captured by the filter arethen counted using Practice F311.5.Significance and Use5.1 This practice is suitable for the removal of contaminantsfound on materials,parts,and components used in