【英文标准名称】:StandardTestMethodforExposureofMembraneSwitchestoTemperatureandRelativeHumidity
【原文标准名称】:温度和相对湿度对薄膜开关影响的标准试验方法
【标准号】:ASTMF1596-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:F01.18
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:薄膜开关;实施规程;开关
【英文主题词】:membraneswitch;relativehumidity(RH);temperature
【摘要】:Changesintemperatureandhumidityduringshipping,storageorusecanaffectthevisualappearance,mechanicalintegrity,orelectricalfunctionalityofswitches.Thispracticesimulatesthreedifferentenvironmentstowhichmembraneswitchesmaybeexposed.Thethreeindustry-recognizedswitchcategoriesbasedonperformancelevelsareLevel1,Level2,andLevel3(seesection8.1).Additionally,theremaybecustomrequirementsthatvarybyapplication,therefore,theserequirementscanbedeterminedbycustomerandvendoragreementandbeestablishedasaLevel4.Thispracticedefinesthedurationofasinglecycle.Multiplecyclesmaybeappropriatedependingontherequirementsoftheapplication.^SCOPE:1.1Thistestmethodcoversaprocedurefortemperatureandhumiditycyclingofmembraneswitches.1.2Thistestmethodisperformedtoevaluatethepropertiesofmaterialsusedintheconstructionofmembraneswitchassembliesastheyareinfluencedbytheabsorptionanddiffusionofmoistureandmoisturevapor.Thisisanacceleratedenvironmentaltest,accomplishedbythecontinuousexposureofthetestspecimentohighrelativehumidityatanelevatedtemperature.Absorptionofmoisturebymanymaterialsresultsinswelling,whichdestroystheirfunctionalutility,causeslossofphysicalstrength,andchangesinothermechanicalproperties.Insulatingmaterialswhichabsorbmoisturemaysufferdegradationoftheirelectricalproperties.1.2.1Physicalchanges:1.2.1.1Differentialcontractionorexpansionratesorinducedstrainofdissimilarmaterials.1.2.1.2.Crackingofsurfacecoatings.1.2.1.3Leakingofsealedcompartments.1.2.1.4Deformationorfractureofcomponents.1.2.2Chemicalchanges:1.2.2.1Separationofconstituents.1.2.2.2Failureofchemicalagentprotection.1.2.3Electricalchanges:1.2.3.1Changesinelectronicandelectricalcomponents.1.2.3.2Electronicormechanicalfailuresduetorapidwaterofcondensateformation.1.2.3.3Excessivestaticelectricity.1.3Thistestmethodisnotintendedtobeathermalshockprocedure;arampratebetweentemperatureextremesshouldnotexceed2x00B0;C/min.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:K31
【国际标准分类号】:31_220_20
【页数】:3P.;A4
【正文语种】: