GB/T 2448-1991 尿素粒度的测定筛分法
时间:2024-05-02 17:39:41 来源: 标准资料网 作者：标准资料网 阅读：9810
基本信息
| 标准名称： | 尿素粒度的测定筛分法 |
| 英文名称： | Urea--Determination of particle size---Sieve method |
| 中标分类： |
化工 >>
化肥、农药 >>
化肥、化学土壤调理剂 |
| 替代情况： | 被GB/T 2441.7-2001代替 |
| 发布日期： | 1900-01-01 |
| 实施日期： | 1992-10-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2002-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 2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： 化工 化肥 农药 化肥 化学土壤调理剂
【英文标准名称】:StandardPracticeforTestingWaterResistanceofCoatingsin100%RelativeHumidity
【原文标准名称】:在100%相对湿度条件下测定涂层耐水性能的标准实施规程
【标准号】:ASTMD2247-2011
【标准状态】:现行
【国别】:
【发布日期】:2011
【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】:D01.27
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:粘附;起泡;湿度;水阻力;锈蚀
【英文主题词】:adhesion;blistering;humidity;resistance-water;rust
【摘要】:Watercancausethedegradationofcoatings,soknowledgeofhowacoatingresistswaterishelpfulforassessinghowitwillperforminactualservice.Failureintestsat100%relativehumiditymaybecausedbyanumberoffactorsincludingadeficiencyinthecoatingitself,contaminationofthesubstrate,orinadequatesurfacepreparation.Thispracticeisthereforeusefulforevaluatingcoatingsaloneorcompletecoatingsystems.Testsat100%relativehumidityareusedforspecificationacceptance,qualitycontrol,andresearchanddevelopmentforcoatingsandsubstratetreatments.Sometestsareusedforapassorfaildeterminationatanarbitrarytime.Acoatingsystemisconsideredtopassifthereisnoevidenceofwater-relatedfailureafteraperiodoftime.Othertestsareusedtomonitordegreeoffailureasafunctionofexposuretime.Arbitrarypass/faillevelsandthetestdurationsrequiredaretypicallysetinothermaterialspecifictestmethods.Usersofthispracticealonemayusetheknownperformanceofthecontrolstosettestendpoints.Anotheroptionistocontinuethetestuntilallspecimenshavefailed,andusethetimetoreachfailureasawaytodifferentiateperformance.Resultsobtainedfromtheuseof100%humiditytestsinaccordancewiththispracticeshouldnotberepresentedasbeingequivalenttoaperiodofexposuretowaterinthenaturalenvironment,untilthedegreeofquantitativecorrelationhasbeenestablishedforthecoatingorcoatingsystem.Thetestchambercanbeasmalllaboratorycabinetoraroomlargeenoughtoholdanautomobileoratruck.Someautomobilemanufacturerstestcompletedvehiclesinroomsmaintainedat100%relativehumidity.Corrosiontestscanbeconducted,asthecondensatedrippingoffthetestarticlesinnotrecirculated.1.1Thispracticecoversthebasicprinciplesandoperatingproceduresfortestingwaterresistanceofcoatingsbyexposingcoatedspecimensinanatmospheremaintainedat100%relativehumiditysothatcondensationformsonthetestspecimens.1.2Thispracticeusesthetechniqueofcreatingaslighttemperaturedifferentialwithintheexposureareatoformcondensationonthecoatedspecimens.Asthewarmersaturatedairpassesthecoolerspecimens,waterisdepositedontothespecimensintheformofcondensation.1.3Thispracticeplacestheentirespecimenintheexposureareaallowingcondensationtoformonallsurfaces.Thismakesthispracticesuitableforflatpanelsaswellaslargeor3Dobjects.Thispracticediffersfromothermethodswherecondensationisonlyformedonthefrontcoatingsurface,butthebacksurfaceisoutsidetheexposurearea.Othertestsmayalsodepositwaterdropletsonthesurfacebutwherethesourceisnotfromcondensation.Note18212;AlternativepracticesfortestingthewaterresistanceofcoatingsincludePracticesD870,D1735,andD4585.1.4Thispracticeislimitedtothemethodsofobtaining,measuring,andcontrollingtheconditionsandproceduresoftestsconductedin100%relativehumidity.Itdoesnotspecifyspecimenpreparation,orevaluationofresults.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriate......
【中国标准分类号】:
【国际标准分类号】:87_040
【页数】:7P.;A4
【正文语种】:
【英文标准名称】:StandardSpecificationforPressureVesselPlates,AlloySteel,Chromium-Molybdenum
【原文标准名称】:压力容器用铬钼合金钢板的标准规格
【标准号】:ASTMA387/A387M-2011
【标准状态】:现行
【国别】:
【发布日期】:2011
【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】:A01.11
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:合金钢;合金钢板;压力容器部件;压力容器钢;钢板;压力容器钢板
【英文主题词】:alloysteel;alloysteelplate;pressurecontainingparts;pressurevesselsteels;steelplates;steelplatesforpressurevessels
【摘要】:1.1Thisspecificationcoverschromium-molybdenumalloysteelplatesintendedprimarilyforweldedboilersandpressurevesselsdesignedforelevatedtemperatureservice.
【中国标准分类号】:
【国际标准分类号】:77_140_30
【页数】:6P.;A4
【正文语种】: