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【英文标准名称】:StandardSpecificationforAerospacePartsMachinedfromPolychlorotrifluoroethylene
【原文标准名称】:机械加工的聚氯三氟乙烯航空航天部件的标准规范
【标准号】:ASTMD7194-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D20.15.12
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:航天技术;橡胶;航空航天运输;航空工程;经机械加工的;塑料;聚氯三氟乙烯
【英文主题词】:annealing;dimensionalstability;finishedparts;PCTFE;polychlorotrifluoroethylene
【摘要】:1.1Thisspecificationisintendedtobeameansofcallingoutfinishedmachinedpartsreadyforaerospaceuse.Suchpartsmayalsofinduseinselectedcommercialapplicationswherethereareclearbenefitsderivedfromtheuseofpartswithknownorcontrolledcrystallinity,highmolecularweight,goodmolecularweightretention,dimensionalstabilityinthefinishedpart,andtightlycontrolledengineeringtolerances.1.2Thisspecificationestablishesrequirementsforpartsmachinedfromvirgin,unplasticized,100%polychlorotrifluoroethylene(PCTFE)homopolymers.1.3ThisspecificationdoesnotcoverpartsmachinedPCTFEcopolymers,PCTFEfilmortapelessthan0.25-mm[0.010-in.]thick,ormodifiedPCTFE(containingpigmentsorplasticizers).1.4Thisspecificationdoesnotallowpartscontainingrecycledmaterial.1.5Thisspecificationclassifiespartsintothreeclassesbaseduponintendedusesandexposures:oxygen-containingmedia,reactivemedia,andinertgases.1.6ApplicationPCTFEcomponentscoveredbythisspecificationarevirgin,100%PCTFEresin,freeofplasticizersandotheradditives.Thecomponentsarecombustionresistantinoxygen,dimensionallystable,andmeetotherspecificphysicalcharacteristicsappropriatefortheirenduse.Theyareusedinvalves,regulators,andotherdevicesinoxygen,air,helium,nitrogen,hydrogen,ammonia,andotheraerospacemediasystems.Thecomponentstypicallyareusedasvalveseats,o-rings,seals,andgaskets.Theyareremovedandreplacedduringnormalmaintenanceprocedures.Thecomponentsprovidereliablesealingsurfacesresultinginproperclosureofvalvesandrelateddevicesandnoleakagefromthesystemintotheenvironment.Theywillexperiencestaticmechanicalloading,cyclicmechanicalloading,temperaturesrangingfromcryogenicto71176;C[160176;F],andpressuresupto46.2MPa[6700psi].1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesinbracketsareforinformationonly.1.8Thefollowingprecautionarycaveatpertainsonlytothetestmethodsportion,Section12ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThereisnoequivalentISOstandard.
【中国标准分类号】:V22
【国际标准分类号】:49_025_40;49_140
【页数】:4P.;A4
【正文语种】: