ASTM_G_120_-_15.pdf

Designation:G12015Standard Practice forDetermination of Soluble Residual Contamination bySoxhlet Extraction1This standard is issued under the fixed designation G120;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 describes a procedure for the determina-tion of residual contamination in materials to be used within orin contact with hardware requiring a high level of cleanliness,such as components for oxygen service,by Soxhlet extraction.1.2 This practice may be used for extracting nonvolatile andsemivolatile residues from solids such as new and used gloves,new and used wipers,contaminated test specimens or controlcoupons,small piece parts(metallic or nonmetallic),etc.Whenused with proposed consumable cleaning materials(wipers,gloves,etc.),this practice may be used to determine thepotential of the proposed solvent to extract contaminants(plasticizers,residual detergents,brighteners,etc.)from thecleaning material and deposit them on the surface beingcleaned.1.3 This practice is not suitable for the evaluation ofparticulate contamination.1.4 The values stated in SI units are standard.1.5 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.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 SpacecraftE1560 Test Method for Gravimetric Determination of Non-volatile Residue From Cleanroom WipersE1731 Test Method for Gravimetric Determination of Non-volatile Residue from Cleanroom GlovesF331 Test Method for Nonvolatile Residue of Solvent Ex-tract from Aerospace Components(Using Flash Evapora-tor)G93 Practice for Cleaning Methods and Cleanliness Levelsfor Material and Equipment Used in Oxygen-EnrichedEnvironmentsG127 Guide for the Selection of Cleaning Agents forOxygen-Enriched SystemsG136 Practice for Determination of Soluble Residual Con-taminants in Materials by Ultrasonic ExtractionG144 Test Method for Determination of Residual Contami-nation of Materials and Components by Total CarbonAnalysis Using a High Temperature CombustionAnalyzer3.Terminology3.1 Definitions:3.1.1 contaminant,nunwanted molecular and particulatematter that could affect the performance of the components ormaterials upon which they reside.3.1.2 contamination,na process of contaminating.3.1.3 control coupon(witness coupon),na coupon madefrom the same material and prepared in exactly the same wayas the test coupons,and which is used to verify the validity ofthe method or part thereof.3.1.3.1 DiscussionIn this test method,the control couponwill be contaminated in the same manner as the test couponsand will be subjected to the identical extraction procedure.3.1.4 molecular contaminant,nnon-particulate contami-nation.3.1.4.1 DiscussionA molecular contaminant may be in agaseous,liquid,or solid state and may be uniformly ornon-uniformly distributed.3.1.4.2 DiscussionMolecular contaminants account formost of the NVR.3.1.5 nonvolatile residue(NVR),nresidual molecular andparticulate matter remaining following the filtration of asolvent containing contaminants and complete evaporation ofthe solvent at a specified temperature.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 Oct.1,2015.Published October 2015.Originallyapproved in 1993.Last previous edition approved in 2008 as G120 01(2008).DOI:10.1520/G0120-15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 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 The specimen is placed in an extraction thimble orbetween two plugs of glass wool and contaminants are ex-tracted using an appropriate solvent in a Soxhlet extractor.Thesolvent is brought to the boiling point and the pure solventvapors travel to the condenser where they condense and dripinto the thimble.When the liquid level in the thimb