SAE J495 Straight Pins (Solid) (Cancelled May 2004)
作者:标准资料网 时间:2024-05-11 04:15:11 浏览:8883
来源:标准资料网
Product Code:SAE J495
Title:Straight Pins (Solid) (Cancelled May 2004)
Issuing Committee:Fasteners Committee
Scope:There is no Scope in this Standard.
【英文标准名称】:StandardTestMethodsforAbsorbanceofPolyethyleneDuetoMethylGroupsat1378cm
【原文标准名称】:含甲基团的聚乙烯对波长为1378cm-1光波吸收率的试验方法
【标准号】:ASTMD2238-1992(2004)
【标准状态】:现行
【国别】:
【发布日期】:1992
【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】:试验;甲基;保持能力;甲基化合物;塑料;聚乙烯
【英文主题词】:Fouriertransformspectroscopy;infraredspectroscopy;methylgroups;polyethylene;quantitativeanalysis
【摘要】:Wheninterpretedwiththeaidofappropriatecalibrationdata,eithertestmethodcanbeusedtocomparethetotalmethylcontentsofpolyethylenesmadebysimilarprocesses.Suchinformationcanbeinterpretedintermsofspecificalkylgroupswiththeaidofdataoninfraredabsorptionatcertainotherwavelengths(3).Note48212;Thebiasofdeterminationoftheconcentrationoftotalalkylgroupsdependsonknowingtheconcentrationsofmethylandethylbranchespresent,sincethesebrancheshaveanomalouslyhighabsorptivitiespergroupat1378cmx2212;1(7.25x03BC;m).Knowledgeoftotalmethylgroupsinpolyethylene,whencombinedwithdataonmolecularweightandonreactiveendgroupssuchasvinyl,canleadtoassignmentofend-groupstructuresandcanshedlightuponpolymerizationmechanisms.Dataontotalmethylgroupsinpolyethylenecanbecorrelatedqualitativelywithcertainpolymerpropertiessuchasmeltingpoint,density,stiffness,andothermechanicalpropertiesthatarecloselydependentonthedegreeofcrystallinityofthepolymer.Thesetestmethodsareespeciallysuitableforresearch.Theyhavenotbeentestedforuseinmanufacturingcontrol.1.1Thesetestmethodscovermeasurementbyinfraredabsorptionspectrophotometryofthe1378.4-cm1(7.255-m)bandinpolyethyleneduetomethylgroups.(1,2,4-7)Twotestmethodsarecovered:1.1.1TestMethodAusescompensationwithastandardsamplefilmorwedgeofknownmethylcontent.1.1.2TestMethodBusescompensationwithawedgeofpolymethyleneorapolyethyleneofknownlowmethylcontent.1.2ThesetestmethodsareapplicabletopolyethylenesofTypesI(density910to925kg/m3),II(density926to940),andIII(density941to965).Note18212;Fordeterminationofdensity,seeSpecificationsD1248.Note28212;IncasesofTypeIIIpolyethylenewithdensitiesgreaterthan0.950g/cm3,differentresultsareobtainedwiththetwotestmethods.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninbracketsareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardsstatementsaregiveninSection7.Note38212;ThereisnosimilarorequivalentISOstandardcoveringthesubjectmatterofthesetestmethods.
【中国标准分类号】:G32
【国际标准分类号】:83_080_20
【页数】:7P.;A4
【正文语种】:
基本信息
| 标准名称： | 印制板镀层孔隙率电图象测试方法 |
| 英文名称： | The electrographic test method of plating porosity for printed boards |
| 中标分类： |
电子元器件与信息技术 >>
电子元件 >>
印制电路 |
| ICS分类： |
电子学 >>
印制电路和印制电路板
|
| 替代情况： | 被GB/T 4677-2002代替 |
| 发布日期： | 1984-07-25 |
| 实施日期： | 1985-05-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2003-04-01 |
| 起草单位： | 电子工业部第15所 |
| 出版日期： | 1900-01-01 |
| 页数： | 4页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 电子元器件与信息技术 电子元件 印制电路 电子学 印制电路和印制电路板
