【英文标准名称】:StandardSpecificationforPartsMachinedfromPolychlorotrifluoroethylene(PCTFE)andIntendedforGeneralUse
【原文标准名称】:聚氯三氟乙烯(PCTFE)加工制零件和通用零件的标准规范
【标准号】:ASTMD7211-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:机械制造的;聚氯三氟乙烯
【英文主题词】:annealing;dimensionalstability;finishedparts;PCTFE;polychlorotrifluoroethylene
【摘要】:1.1Thisspecificationisintendedtobeameansofcallingoutfinishedmachinedpartsreadyforcommercialuse.1.2Thisspecificationestablishesrequirementsforpartsmachinedfromunplasticized,100%polychlorotrifluoroethylene(PCTFE)homopolymers.1.3ThisspecificationdoesnotcoverpartsmachinedfromPCTFEcopolymers,PCTFEfilmortapelessthan0.25-mm[0.010-in.]thick,ormodifiedPCTFE(containingpigmentsorplasticizers).1.4Thisspecificationallowsforpartscontainingregrindandrecycledmaterial.1.5ThespecificationdoesnotcoverPCTFEpartsusedinaerospaceapplicationsinvolvingstorageandhandlingofoxygenmedia,airmedia,inertmedia,andcertainreactivemedia(specificallyammonia,gaseoushydrogen,andliquidhydrogen),inwhichdimensionalstability,highmolecularweight,molecularweightretention,andcrystallinitycontrolareimportantconsiderations.Foraerospacegrade,machinedPCTFEparts,useSpecificationD7194.1.6ApplicationPCTFEpartscoveredbythisspecificationaremadeof100%PCTFEresin,freeofplasticizers,fillers,orotheradditives.Thepartsmeetspecificphysicalcharacteristicsappropriatefortheirenduse,andaretypicallyusedinapplicationsrequiringgoodelectricalpropertiesorresistancetoaggressivechemicalmedia.GeneralpurposePCTFEpartsincludeseals,gaskets,valveandpumpparts(cryogenicandnoncryogenic),translucenttubing,sightglasses,flowmetertubes,heavy-walledsolidpipesandfittings,gears,cams,bearings,laboratoryware,circuitboards,electricalconnectorcoversandswitches,radomecovers,andavarietyofotherstockshapes.Theyareremovedandreplacedduringnormalmaintenanceprocedures.Thepartsalsoexperiencestaticordynamicmechanicalloading,andtemperaturesrangingfromcryogenictotemperaturesatorabovetheglasstransitiontemperature,Tg=55C[131F].Note1Quick-quenchedPCTFEwillpotentiallyexhibitdimensionalrelaxationinthevicinityofTg.Note2AlthoughnorecommendationsaremaderegardingthelimitingupperusetemperatureofPCTFE,theheatdeflectiontemperatureofPCTFEasdeterminedbyTestMethodD648is126C[259F].1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesinbracketsareforinformationonly.Thefollowingprecautionarycaveatpertainsonlytothetestmethodsportion,Section,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note3ThereisnoequivalentISOstandard.
【中国标准分类号】:G33
【国际标准分类号】:83_140_01
【页数】:4P.;A4
【正文语种】:
基本信息
| 标准名称： | 窄形下基础板 |
| 发布日期： | 1988-04-09 |
| 实施日期： | 1988-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
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