JJG (航天) 32-1987 丝锥中径比较表检定规程
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来源:标准资料网
基本信息
| 标准名称： | 丝锥中径比较表检定规程 |
| 中标分类： |
综合 >>
计量 >>
长度计量 |
| 发布日期： | |
| 实施日期： | 1999-08-31 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 8页 |
适用范围
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引用标准
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所属分类： 综合 计量 长度计量
【英文标准名称】:StandardTestMethodforMeasurementofFinesandDustParticlesonPlasticPelletsbyWetAnalysis
【原文标准名称】:用湿法分析法测量塑料粒上的细粒土和粉尘颗粒的标准试验方法
【标准号】:ASTMD7486-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:dustparticles;fines;plastics;wetanalysis;Dust;Fines;Plastics;Wetanalysis
【摘要】:Moldingandextrudingplasticpelletsrequiredustfree,drypelletstopreventprocessingproblems.Plasticproducerstrytoremovethedustandstreamerswithdustremovalsystemspriortopackagingandloading.Howtoaccuratelymeasuredustandstreamercontentinplasticpelletsisanimportantqualitycontrolissue.Particlesizeanalysisisusedtodetermineapercentageofparticlesizedistributionfromarepresentativesampleofthewhole.Intermsofsizeanalysisconcerningplasticpellets,sievingisusedtodeterminethedustcontentintherangeof500to2000micron.TestMethodD1921,TestMethodB,isusedtodeterminethistypeofparticlesizing.Afterdrysieveanalysis,particlessmallerthan500micronsneedtobeanalyzedbywetmethod.Afreshsampleshallbeusedforwetanalysis.Thistestmethodallowswashingdownthefinesattachedtothepelletsbyelectrostaticforces.Thewetanalysisprovidesaccuratequantificationofsmalltolargeamountsoffines,negatingstaticeffects,andeliminatingdetrimentaleffectsofmechanicalagitation.AwetanalysismustbeemployedtoaccuratelyquantifylowerPPMdustlevelsinplasticpellets.1.1Thistestmethodmeasurestheamountoffineparticlesadheredonplasticpelletsorgranulesinwhichtheyarecommonlyproducedandsupplied.Thelowerlimitofthistestmethodisrestrictedonlybytheporosityofthefilterdiscusedtocapturetheparticlesizebeingquantified.1.2Thewetanalysistechniqueallowsforseparationandcollectionofstaticallychargedparticlesbyliquidwashandfiltrationmethods.Thismustbeperformedunderstandardlaboratoryconditions.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.1.4Thistestmethoddescribesanessentialpracticetocheckthequalityofplasticsoncetheproductioncycleisterminatedandtoevaluatetheperformanceofpelletcleaningsystemsorofthespecialpneumaticconveyingsystemsforthedistinctsizefractionsbelow500micrononly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThereisnoknownISOequivalenttothisstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_140_99
【页数】:4P.;A4
【正文语种】:英语
MIL-PRF-24712A (AMENDMENT 1), MILITARY SPECIFICATION, COATINGS, POWDER (19 MAR 1997) [SUPERSEDING MIL-C-24712]., This amendment forms a part of MIL-PRF-24712A, dated 25 May 1995, and is approved for use by all Departments and Agencies of the Department of Defense.
