MIL-STD-690D
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MIL-STD-690D, DEPARTMENT OF DEFENSE STANDARD PRACTICE: FAILURE RATE SAMPLING PLANS AND PROCEDURES (10 JUN 2005)., This standard provides procedures for failure rate (FR) qualification, sampling plans for establishing FR levels at selected confidence levels, and lot conformance inspection procedures associated with FR testing for the purpose of direct reference in appropriate military electronic parts established reliability (ER) specifications. Figures and tables throughout this standard are based on exponential distribution. Weibull distribution will be acceptable in certain components such as capacitors. Use of Weibull distribution for any component must be approved by the qualifying activity. This standard also provides guidance to specification writers in the use of this standard (see appendix A) and references material for users of ER parts.
Product Code:SAE AMS3110
Title:Primer, Zinc Chromate (Cancelled Jun 2009)
Issuing Committee:Ams G8 Aerospace Organic Coatings Committee
Scope: This specification has been declared 鈥淐ANCELLED鈥?by the Aerospace Materials Division, SAE, as of June 2009. By this action, this document will remain listed in the Numerical Section of the Index of Aerospace Material Specifications indicating that it has been 鈥淐ANCELLED鈥?Cancelled specifications are available from SAE.
Rationale: This specification has been declared 鈥淐ANCELLED鈥?by the Aerospace Materials Division, SAE, as of June 2009. By this action, this document will remain listed in the Numerical Section of the Index of Aerospace Material Specifications indicating that it has been 鈥淐ANCELLED鈥?Cancelled specifications are available from SAE.【英文标准名称】:StandardPracticeforEstimatingCriticalSurfaceTensions
【原文标准名称】:临界表面张力的估算的标准办法
【标准号】:ASTMD7541-2009
【标准状态】:现行
【国别】:
【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】:D01.23
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:criticalsurfacetension;dewetting;surfacecontamination;wettability;wetting
【摘要】:Knowledgeofthecriticalsurfacetensionofsubstrates,primersandothercoatingsisusefulforexplainingorpredictingwettabilitybypaintsandothercoatingsappliedtothosesurrfaces.Surfaceswithlowcriticalsurfacetensionsusuallyarepronetosufferdefectssuchascrawling,pictureframing,crateringandlossofadhesionwhenpainted.Loworirregularvalues,orboth,oftenareindicativeofcontaminationthatcouldreduceadhesion.Surfaceswithhighcriticalsurfacetensionsareeasytowetandusuallyprovideanexcellentplatformforpainting.Theswab,markingpenanddraw-downtestsallsimulatetheapplicationofafilmTheswabandmarkingpentechniquesaresimpleandrapidandareparticularlyusefulfortestinginthefieldoroncurved,irregularorporoussurfaceswherecontactanglescannotbemeasured.Thedroptestdoesnotworkwellonsuchsurfacesandthedraw-downmethodrequiresaflatspecimenthatisrelativelylarge.Theestimationofcriticalsurfacetensionhasbeenusefulincharacterizingsurfacesbeforeandaftercleaningprocessessuchaspowerwashesandsolventwipesinordertoevaluatetheefficiencyofthecleaning.Oneormoreofthesetechniquescouldbethebasisofago/no-goqualitycontroltestwhereifacertainliquidwets,thesurfaceisacceptableforpainting,butifthatliquidretractsandcrawls,thesurfaceisnotacceptable.Anothergo/nogotestispossiblewherethetestliquidisapaintandthesurfaceisasubstrate,primerorbasecoat.Aformofthistesthasbeenusedforcoatingsforplastics.1.1Thispracticecoversproceduresforestimatingvaluesofthecriticalsurfacetensionofsurfacesbyobservingthewettinganddewettingofaseriesofliquids(usuallyorganicsolvents)appliedtothesurfaceinquestion.1.2Anothertechnique,measurementofthecontactangles,x03B8;,ofaseriesoftestliquidsandplottingcosx03B8;versussurfacetension(Zismanplots),providesdatathatallowthedeterminationofmoreexactvaluesforcriticalsurfacetension.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:
【国际标准分类号】:25_220_01
【页数】:3P.;A4
【正文语种】:
