1、Designation:E137799(Reapproved 2016)Standard Specification forLaboratory Glass Kjeldahl Flasks1This standard is issued under the fixed designation E1377;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numb
2、er in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification provides standard dimensional re-quirements for glass Kjeldahl flasks for nitrogen digestionanalysis.2.Referenced Documents2
3、.1 ASTM Standards:2E147 Specification for Apparatus for Microdetermination ofNitrogen by Kjeldahl MethodE438 Specification for Glasses in Laboratory ApparatusE671 Specification for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory ApparatusE694 Specification for Laboratory Gl
4、ass Volumetric Appa-ratusE920 Specification for Commercially Packaged LaboratoryApparatusE921 Specification for Export Packaged Laboratory Appa-ratusE1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus for United States Government Procure-mentsE1157 Specification for Sampling and
5、 Testing of ReusableLaboratory Glassware3.Classification3.1 Ungraduated Flasks,Type I,shall be of the followingcapacities:100 mL300 mL500 mL650 mL800 mL3.1.1 Sizes 10 mL and 30 mL and the Soltys style 30 mL arecovered under Specification E147 and are not included herein.3.2 Graduated Flasks,Type II,
6、shall be of the followingcapacity:800 mL,graduated at 1000 mLNOTE1The term millilitre(mL)is commonly used as a special namefor the cubic centimetre(cm3)and similarly the litre(L)for 1000 cubiccentimetres,in accordance with the International System of Units(SI).4.Material and Annealing4.1 Flasks shal
7、l be made of borosilicate glass conforming tothe requirement of Type I,Class A of Specification E438.4.2 Maximum residual thermal stress shall conform toSpecification E671.5.Appearance5.1 The general appearance of the flasks shall conform toFig.1.6.Design6.1 Necks on all flasks shall be circular in
8、cross section,andshall be perpendicular to center of flask body.6.2 Top finish of flask shall not be belled over 2 in.from thetop.Top shall be tooled or beaded.6.3 Interior neck finish of sizes 500 and 800 mL may betooled to accept special rubber stopper especially made forKjeldahl flasks.6.4 Bottom
9、 of flask shall be hemispherical in shape,whiletop has a curved taper to point of junction with the flask neck.(See Fig.1.)6.5 Wall thickness of flasks shall be controlled in accor-dance with Table 1.7.Volumetric Accuracy7.1 Tolerance on volumetric accuracy of Type II flasks shallbe in compliance wi
10、th Specification E694(1000 6 1.5 mL).8.Capacity and Dimensions8.1 The nominal capacity of the ungraduated,Type I flasksshall not exceed the actual capacity to the base of the neck.The1000 mL graduated flask capacity ring shall be within the neckof the flask.Dimensions shall conform to the requiremen
11、ts ofTable 1.1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onLaboratory Ware and Supplies.Current edition approved Sept.1,2016.Published September 2016.Originallyapproved in 1990.Last previous editio
12、n approved in 2010 as E1377 99(2010).DOI:10.1520/E1377-99R16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyr
13、ight ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 9.Markings9.1 Each flask shall be permanently marked with the nameor known trademark of the manufacturer and the nominalcapacity for Type I flasks and actual capacity for Type II flasks.9.2 There
14、 shall be an area on one side of the flask neck formarking with a pencil.10.Sampling10.1 Refer to Specification E1157.11.Sampling11.1 Select from Specifications E920,E921,and E1133.12.Keywords12.1 flasks;glass;kjeldahlASTM International takes no position respecting the validity of any patent rights
15、asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time b
16、y the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of theresponsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you shouldmake your views known to the AS
