【英文标准名称】:StandardClassificationforNaturalMuscoviteBlockMicaandThinsBasedonVisualQuality
【原文标准名称】:天然白云母块及薄片目检质量的标准分级
【标准号】:ASTMD351-1997(2008)e1
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【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】:D09.19
【标准类型】:(Classification)
【标准水平】:()
【中文主题词】:
【英文主题词】:BengalIndiaSystem;block;classification;foreigninclusions;form;grading;muscovitemica;size;thins;visualquality;BengalIndiaSystem;Classification(standards)--insulation;Duplexstainlesssteel;Mica;Opticalmaterials/properties/tes
【摘要】:Thepropertiesincludedinthisstandardarethoserequiredtocontrolthevisualquality,usablearea,thickness,hardness,andstiffness.1.1Thisclassificationcoversthedeterminationofcommerciallyavailablenaturalmuscoviteblockmicaandisintendedtobeindependentofthebasiccolorofthemicaoritssource.1.2Muscovitemicaischaracterizedbyhavinganopticalaxialanglebetween50and75x00B0;(seeAppendixX1);andhasaweightlosswhenheatedfor5minat600x00B0;Cnotexceeding0.2%(basedontheweightafterdryingat120x00B0;C).1.3Thevisualsystemofclassifyingthequalityofnaturalmuscovitemicacoveredbythisspecificationisbaseduponrelativeamountsofvisibleforeigninclusionssuchasairbubbles,stains,andspotsincombinationwithrelativeamountsandtypesofwaviness,aswellasotherphysicalproperties.Inthissystem,aperfectlyclear,transparent,flatspecimenofmicaisthevisualstandardofperfection.Increasingamountsofvisualdefectslowerthevisualquality,andatotalof13levelsofvisualqualityarecoveredbythisstandard.Thismethodofclassification,generallyknownastheBengalIndiaSystem,ispurelyqualitativeandisentirelydependentonpersonalopinionandjudgment.1.4Thestandardsforvisualqualityclassificationthatarecoveredinthisclassificationarethebestcommerciallyavailableconceptofthevariousqualitiesandtheirrelativepositions.Variationsinthemethodsofusingandapplyingthesestandardsfromthosehereindefinedmaybespecifiedbythepurchaser,ordefinedbyagreementbetweenthesupplierandthepurchaser.1.5Standardsizeclassificationsaredefined,baseduponavailableusablerectangularareasandtheminimumdimensionsoftherectanglesthatthepieceswillyield.Precautionstobetakeninmakingthicknessmeasurementsarealsodescribed.1.6Thisstandardcoversthefollowingtwodefiniteformsofcommercialpreparation:1.6.1Form18212;Full-trimmednaturalblockmica,0.007in.(0.178mm)minimumthickness.1.6.2Form28212;Partially-trimmednaturalblockmica,0.007in.minimumthickness.1.7Thebasiccolorofmica,suchaswhite,ruby,lightgreen,darkgreen,brownishgreen,andrum,aswellasothercolors,andthemethodofcontrollingthecolorandotherproblemsassociatedwiththebasiccolor,arenotapartofthisclassification.1.8Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.9Section5istechnicallyidenticaltoproceduresspecifiedinISO67-1981.1.10Section6differssomewhatinprocedurefromISO5972-1978,butdataobtainedbyeithershouldbeidentical.1.11Section7istechnicallyidenticaltoproceduresspecifiedinISO2185-1972.
【中国标准分类号】:Q63
【国际标准分类号】:73_080
【页数】:6P.;A4
【正文语种】:英语


【英文标准名称】:
【原文标准名称】:照相镜头焦距的测定方法
【标准号】:JISB7094-1978
【标准状态】:作废
【国别】:日本
【发布日期】:1978-03-01
【实施或试行日期】:1978-03-01
【发布单位】:日本工业标准调查会(JISC)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:焦距测量;摄影镜头;摄影机镜头
【英文主题词】:
【摘要】:
【中国标准分类号】:N43
【国际标准分类号】:
【页数】:
【正文语种】: