1、Designation:G8698a(Reapproved 2011)Standard Test Method forDetermining Ignition Sensitivity of Materials to MechanicalImpact in Ambient Liquid Oxygen and Pressurized Liquidand Gaseous Oxygen Environments1This standard is issued under the fixed designation G86;the number immediately following the des
2、ignation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method2describes test equipm
3、ent and tech-niques to determine the impact sensitivity of materials inoxygen under two different conditions:(1)in ambient pressureliquid oxygen(LOX)or(2)under pressure-controlled condi-tions in LOX or gaseous oxygen(GOX).It is applicable tomaterials for use in LOX or GOX systems at pressures fromam
4、bient to 68.9 MPa(0 to 10 000 psig).The test methoddescribed herein addresses testing with pure oxygen environ-ments;however,other oxygen-enriched fluids may be substi-tuted throughout this document.1.2 This test method provides a means for ranking nonme-tallic materials as defined in Guide G63 for
5、use in liquid andgaseous oxygen systems and may not be directly applicable tothe determination of the sensitivity of the materials in anend-use configuration.This test method may be used to providebatch-to batch acceptance data.This test method may providea means for evaluating metallic materials in
6、 oxygen-enrichedatmospheres also;however,Guide G94 should be consulted forpreferred testing methods.1.3 Values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns,if any,a
7、ssociated 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.See also Section 9.2.Referenced Documents2.1 ASTM Standards:3D1193 Specification for Reagent Water
8、D4080 Specification for Trichloroethylene,Technical andVapor-Degreasing GradeG63 Guide for Evaluating Nonmetallic Materials for Oxy-gen ServiceG88 Guide for Designing Systems for Oxygen ServiceG93 Practice for Cleaning Methods and Cleanliness Levelsfor Material and Equipment Used in Oxygen-EnrichedE
9、nvironmentsG94 Guide for Evaluating Metals for Oxygen Service2.2 Military Document:4MIL-D-16791 Detergent,General Purpose(Liquid,Non-ionic),Type One2.3 American Chemical Society:5Trichloroethylene,Reagent Grade2.4 Compressed Gas Association:6G-4 OxygenG-4.1 Cleaning Equipment for Oxygen ServiceG-4.3
10、 Oxygen,Gaseous,Type I BG-4.3 Oxygen,Liquid,Type II BG-10.1 Nitrogen,Gaseous,Type I BG-10.1 Nitrogen,Liquid,Type II B2.5 NASA Standard:7NSS 1740.15 Safety Standard for Oxygen and OxygenSystems1This test method is under the jurisdiction of ASTM Committee G04 onCompatibility and Sensitivity of Materia
11、ls in Oxygen Enriched Atmospheres and isthe direct responsibility of G04.01 on Test Methods.Current edition approved April 1,2011.Published April 2011.Originallyapproved in 1984.Last previous edition approved in 2005 as G86-98a(2005).DOI:10.1520/G0086-98AR11.2NASA Handbook 8060.1B,Pressurized Liquid
12、 and Gaseous Oxygen Mechani-cal Impact Test,Sept.1981,pp.4-72.3For 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.4Ava
13、ilable from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/dodssp.daps.dla.mil.5Available from American Chemical Society(ACS),1155 Sixteenth Street,NWWashington,DC 20036,http:/www.acs.org.6Available from Compressed Gas Association(CGA),4221
14、 Walney Rd.,5thFloor,Chantilly,VA 20151-2923,http:/.7Available from NationalAeronautics and SpaceAdminstration(NASA),NASAHeadquarters,Suite 1M32,Washington,DC 20546.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 2.6 ASTM Adjuncts:ABMA-Ty
15、pe Impact Tester and Anvil83.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 GOX,ngaseous oxygen.3.1.2 LOX,nliquid oxygen.3.1.3 mechanical impact,na blow delivered by a plummetthat has been dropped from a preestablished height onto astriker pin in contact with a sample.3.1.4 reac
16、tion,na chemical change or transformation inthe sample initiated by a mechanical impact.3.1.4.1 DiscussionA reaction from ambient pressure,LOX mechanical impact may be determined by an audiblereport,an electronically or visually detected flash,obviouscharring of the sample,cup,or striker pin.3.1.4.2 DiscussionReactions in pressurized LOX or GOXare typically indicated by an abrupt increase in test sampletemperature,chamber pressure,and light levels and may besupplemented by obvious changes in odo
