JJG 173-1986 XFC-6A型标准信号发生器检定规程
作者:标准资料网 时间:2024-05-15 01:35:55 浏览:9049
来源:标准资料网
基本信息
标准名称: | XFC-6A型标准信号发生器检定规程 |
英文名称: | Verification Regulation of XFC -6A Type Standard Signal Generator |
中标分类: |
综合 >>
计量 >>
无线电计量 |
替代情况: | JJG 173-1976;被JJG 173-2003代替 |
发布日期: | 1999-11-12 |
实施日期: | 2003-05-04 |
首发日期: | |
作废日期: | |
出版日期: | |
页数: | 24页 |
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所属分类: 综合 计量 无线电计量
【英文标准名称】:StandardTestMethodforDeterminingGelContentinCrosslinkedEthylenePlasticsUsingPressurizedLiquidExtraction
【原文标准名称】:用加压溶剂萃取法测定交联乙烯塑料中凝胶含量的标准试验方法
【标准号】:ASTMD7567-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:D20.70
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:Manyimportantpropertiesofcrosslinkedethyleneplasticsvarywiththegelcontent.Hence,determinationofthegelcontentprovidesameansofbothcontrollingtheprocessandratingthequalityoffinishedproducts.Extractiontestspermitverificationofthedesiredgelcontentofanygivencrosslinkedethyleneplasticandtheyalsopermitcomparisonbetweendifferentcrosslinkedethyleneplastics,includingthosecontainingfillers,providedthat,forthelatter,thefollowingconditionsaremet:Thefillerisnotsolubleinxyleneortolueneattheextractiontemperatureandtheamountoffillerpresentinthecompoundisknownorcanbedetermined.Sufficientcrosslinkinghasbeenachievedtopreventmigrationoffillerduringtheextraction.Usuallyithasbeenfoundthat,atextractionlevelsupto50%,theextractionsolventremainsclearandfreeoffiller.Sincesomeoxidativedegradationofthematerialcanoccurattheextractiontemperaturesusedinthisprocedure,despitetheuseofaclosedcellwhichallowsforminimalintroductionofoxygen,asuitableantioxidantisaddedtothesolventtoinhibitsuchdegradation.Beforeproceedingwiththismethod,referenceshouldbemadetothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameters,orcombinationthereof,coveredinthematerialsspecificationshalltakeprecedenceoverthosementionedinthistestmethod.Iftherearenomaterialspecifications,thenthedefaultconditionsapply1.1Thegelcontentofcrosslinkedethyleneplasticsisdeterminedbysolventextractionwithxyleneortoluene.Thistestmethodisapplicabletoethyleneplasticsofalldensities,includingthosecontainingfillers;providedthefillersareinsolubleintheextractionsolvent(s).1.2Thistestmethodusespressurizedliquidextraction(PLE)toincreasethespeedandreducetheamountofsolventrequiredforsolventextraction.TheresultsofthismethodaresimilartoTestMethodD2765.1.3Extractiontestsshallbeperformedonsamplesofanyshape(see7.2).Specimensshallbeselectedfromthoseportionsofthearticlemostsusceptibletoinsufficientcrosslinkingorselectedfromportionsrepresentativeoftheentirearticle.Thistestmethodhasbeendevelopedforproductionandqualitycontrolofcrosslinkedpolyethylenepipebutmaybeapplicabletootherproductssuchasmultilayermaterialsandfibers.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thismethodmakesuseofminimalreagentsandallowsforsolventrecoveryandre-use.Duetotheuseofminimalreagents,healthandsafetyconcernsareminimizedincomparisontoothermethods.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecificprecautionarystatementsaregiveninSection10.Note18212;ThereisnoknownISOequivalenttothistestmethod.ThistestmethodissimilartoTestMethodD2765.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:5P.;A4
【正文语种】:英语
基本信息
标准名称: | 带式压榨过滤机 试验方法 |
中标分类: |
机械 >>
通用机械与设备 >>
分离机械 |
替代情况: | 调整为JB/T 8102.3-1995 |
发布日期: | |
实施日期: | 1990-01-01 |
首发日期: | |
作废日期: | |
出版日期: | |
页数: | 6页 |
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所属分类: 机械 通用机械与设备 分离机械