基本信息
标准名称: | CJX系列交流接触器 |
中标分类: |
电工 >>
低压电器 >>
控制电器 |
替代情况: | 被JB/T 7435-2006代替 |
发布日期: | 1994-09-06 |
实施日期: | 1995-07-01 |
首发日期: | 1900-01-01 |
作废日期: | 2007-03-01 |
出版日期: | 1900-01-01 |
页数: | 32 页 |
适用范围
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前言
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引用标准
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所属分类: 电工 低压电器 控制电器
【英文标准名称】:MethodforTestingPolyurethanePolyolRawMaterials:DeterminationofHydroxylNumbersofPolyols(08.03)
【原文标准名称】:聚氨酯多元醇原材料测试方法:多元醇羟基数测定(08.03)
【标准号】:ANSI/ASTMD4274-1999
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【实施或试行日期】:2000-01-18
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:塑料;聚氨酯;试验
【英文主题词】:polyurethane;plastics;testing
【摘要】:Thesetestmethodsmeasurethehydroxylgroupsinpolyesterandpolyetherpolyolscontainingprimaryandsecondaryhydroxylgroups.Theyalsoapplytomanyotherhydroxyl-containingsubstances.TestMethodA-AceticAnhydridePressureBottlerecommendedforpolyesters.TestMethodB-PhthalicAnhydridePressureBottlerecommendedforpolyethersandpolyesters.TestMethodC-PhthalicAnhydrideRefluxrecommendedforpolyethersandpolyesters.TestMethodD-Imidazole-CatalyzedPhthalicAnhydridePressureBottlerecommendedforpolyethers,polyesters,polymerpolyols,andamine-initiatedpolyols.TestMethodEImidazole-CatalyzedPyromelliticDianhydrideEsterification,recommendedforpolyolsusedforflexibleandrigidpolyurethanefoamsandurethaneelastomers.Itisrecommendedforpolyesterpolyols,polyetherpolyols,amine-startedpolyols,andpolymerpolyols(polyacrylonitrile/copolystyrene-based).OtherASTMtestmethodsformeasuringhydroxylgroupsareTestMethodsD1957andE222(seeNote0).Note1-TestMethodCisessentiallysimilartoISO6796-1981,buttherearesomedifferencesintheconcentrationsusedandsomeproceduraldetails.TherearecurrentlynodataavailableforcomparingtheresultsofTestMethodCtothoseofISO6796-1981.ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:
【正文语种】:英语