ASTM_D_2512_-_95_2008.pdf

Designation:D251295(Reapproved 2008)Standard Test Method forCompatibility of Materials with Liquid Oxygen(ImpactSensitivity Threshold and Pass-Fail Techniques)1This standard is issued under the fixed designation D2512;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This method2,3,4covers the determination of compatibil-ity and relative sensitivity of materials with liquid oxygenunder impact energy using the Army Ballistic Missile Agency(ABMA)-type impact tester.Materials that are impact-sensitivewith liquid oxygen are generally also sensitive to reaction byother forms of energy in the presence of oxygen.1.2 This standard should be used to measure and describethe properties of materials,products,or assemblies in responseto heat and flame under controlled laboratory conditions andshould not be used to describe or appraise the fire hazard orfire risk of materials,products,or assemblies under actual fireconditions.However,results of this test may be used aselements of a fire risk assessment which takes into account allof the factors which are pertinent to an assessment of the firehazard of a particular end use.1.3 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to use.2.Referenced Documents2.1 ASTM Standards:5C145 Specification for Solid Load-Bearing Concrete Ma-sonry Units(Withdrawn 1992)6D1193 Specification for Reagent Water2.2 Military Standards:MIL-D-16791G Detergent,General Purpose(Liquid,Non-ionic)7MIL-P-27401C Propellant Pressurizing Agent,Nitrogen7MIL-PRF-25508F Propellant,Oxygen7MIL-T-27602B Trichloroethylene,Oxygen Propellant Com-patible8MIL-C-81302D Cleaning Compound,Solvent,Trichlorotri-fluorocarbon72.3 ASTM Adjuncts:Type Impact Tester and Anvil Region Assembly,38 Draw-ings3.Summary of Test Method3.1 A sample of the test material is placed in a specimencup,precooled and covered with liquid oxygen,and placed inthe cup holder located in the anvil region assembly of theimpact tester.A precooled striker pin is then centered in thecup.The plummet is dropped from selected heights onto thepin,which transmits the energy to the test specimen.Observa-tion for any reaction is made and the liquid oxygen impactsensitivity of the test material is noted.Drop tests are continuedusing a fresh specimen cup and striker pin for each drop,untilthe threshold valve is achieved.A series of drop tests areconducted at an energy level of 98 J(72 ftlbf)or as specifiedfor the pass-fail tests.4.Significance and Use4.1 When this test method is used to measure the thresholdimpact sensitivity of a material,a relative sensitivity assess-ment is obtained which permits the ranking of materials.1This test method is under the jurisdiction of ASTM Committee G04 onCompatibility and Sensitivity of Materials in Oxygen Enriched Atmospheres and isthe direct responsibility of Subcommittee G04.01 on Test Methods.Current edition approved April 1,2008.Published July 2008.Originallyapproved in 1966.Last previous edition approved in 2002 as D2512 95(2002)1.DOI:10.1520/D2512-95R08.2NASA Handbook 8060.1B,Ambient LOX Mechanical Impact Screening Test,September 1981,pp.4-53 through 4-71.“Oxygen Systems.”George C.MarshallSpace Flight Center,National Aeronautics and Space Administration.SpecificationMSFC 106B.September 1981.3“Lubrication and Related Research and Test Method Development for AviationPropulsion Systems.”Technical Report No.59-726.Wright Air DevelopmentDivision,January 1960.4“General Safety Precautions for Missile Liquid Propellants.”5For 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.6The last approved version of this historical standard is referenced onwww.astm.org.7Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/dodssp.daps.dla.mil.8Cancelled in 1983.Previously available from Standardization DocumentsOrder Desk,DODSSP,Bldg.4,Section D,700 Robbins Ave.,Philadelphia,PA19111-5098,http:/dodssp.daps.dla.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 This test method may also be used for acceptance-testing materials for use in liquid oxygen systems.Twentyseparate samples of the material submerged in liquid oxygenare subjected to 98 J(72 ftlbf)or as specified.Impact energy