ASTM_B_845_-_97_2013e1.pdf

Designation:B84597(Reapproved 2013)1Standard Guide forMixed Flowing Gas(MFG)Tests for Electrical Contacts1This standard is issued under the fixed designation B845;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.1NOTEFootnote 3 was corrected editorially in October 2014.1.Scope1.1 The techniques described in this guide pertain to mixedflowing gas(MFG)tests containing species that are applied toevaluate devices containing electrical contacts such as sliprings,separable connectors,electromechanical relays or switchcontacts.These techniques may be relevant to other devices,but it is the responsibility of the user to determine suitabilityprior to testing.1.2 The MFG tests described in this guide are designed toaccelerate corrosive degradation processes.These accelera-tions are designed such that the degradation occurs in a muchshorter time period than that expected for such processes in theintended application environment of the device being tested.Application environments can vary continuously from benignto aggressively corrosive.Connectors and contacts withinclosed electronic cabinets may be affected by an environmentof different severity than the environment on the outside ofsuch cabinets.In general,indoor environments are differentthan outdoor environments.The MFG tests described herein,being discrete embodiments of specific corrosive conditions,cannot be representative of all possible application environ-ments.It is the responsibility of the test specifier to assure thepertinence of a given test condition to the specifiers applica-tion condition.1.3 The MFG tests described herein are not designed toduplicate the actual intended application environment of thedevice under test.An extended bibliography that providesinformation which is useful to test specifiers to assist them inselecting appropriate test methods is included in this guide.The bibliography covers the scope from application conditioncharacterization,single and multiple gas effects,and materialand product effects to key application and test variables as wellas discussions of atmospheric corrosion processes.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 become familiarwith all hazards including those identified in the appropriateMaterial Safety Data Sheet(MSDS)for this product/materialas provided by the manufacturer,to establish appropriatesafety and health practices,and determine the applicability ofregulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2B542 Terminology Relating to Electrical Contacts and TheirUseB808 Test Method for Monitoring ofAtmospheric CorrosionChambers by Quartz Crystal MicrobalancesB810 Test Method for Calibration ofAtmospheric CorrosionTest Chambers by Change in Mass of Copper CouponsB825 Test Method for Coulometric Reduction of SurfaceFilms on Metallic Test SamplesB826 Test Method for Monitoring Atmospheric CorrosionTests by Electrical Resistance ProbesB827 Practice for Conducting Mixed Flowing Gas(MFG)Environmental Tests2.2 Other Documents:EIA-364B-TP65 Mixed Industrial Gas Test Procedure3IECStandard68-242 BasicEnvironmental TestingProcedures,Test KcSulphur Dioxide Test for Contacts andConnections4IECStandard68-243 BasicEnvironmental TestingProcedures,Test KdHydrogen Sulfide Test for Contactsand Connections41This guide is under the jurisdiction of ASTM Committee B02 on NonferrousMetals and Alloys and is the direct responsibility of Subcommittee B02.11 onElectrical Contact Test Methods.Current edition approved Aug.1,2013.Published August 2013.Originallyapproved in 1993.Last previous edition approved in 2008 as B845 97(2008)2.DOI:10.1520/B0845-97R13E01.2For 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.3Available from IHS,15 Inverness Way East,Englewood,CO 80112,http:/.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 IEC Technical Trend Document 68-260 TTD Environmen-tal Testing,Corrosion Tests in Artificial Atmosphere atVery Low Concentration of Polluting Gas(es)4IEC 68-260(second edition)Environmental TestingPart2:Teststest Ke:Flowing mixed gas corrosion test,1995IEEE P1156.1 Environmental Specifications for ComputerModules(Draft 4 June 10,1992unapproved)53.Terminology3