1、Designation:E118900(Reapproved 2016)Standard Specification forMicro-Burets(Koch Style)1This standard is issued under the fixed designation E1189;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in pa
2、rentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers two styles of glass micro-burets of the“Koch”type for general laboratory use.1.2 The values stated in SI units are to be rega
3、rded asstandard.No other units of measurement are included in thisstandard.2.Referenced Documents2.1 ASTM Standards:2E438 Specification for Glasses in Laboratory ApparatusE675 Specification for Interchangeable Taper-Ground Stop-cocks And StoppersE676 Specification for Interchangeable Taper-Ground Jo
4、intsE677 Specification for Interchangeable Spherical GroundJointsE694 Specification for Laboratory Glass Volumetric Appa-ratusE911 Specification for Glass Stopcocks with Polytetrafluo-roethylene(PTFE)PlugsE920 Specification for Commercially Packaged LaboratoryApparatusE921 Specification for Export P
5、ackaged Laboratory Appa-ratusE1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus for United States Government Procure-mentsE1157 Specification for Sampling and Testing of ReusableLaboratory Glassware3.General Requirements3.1 MaterialBurets shall be made from Type I,Class A orB g
6、lass as specified in Specification E438.3.2 StopcocksBoth burets shall have permanently attachedstopcocks with either glass plugs conforming to SpecificationE675 or PTFE plugs conforming to Specification E911.3.3 Joints and StoppersAll joints and stoppers shall com-ply with the requirements of Speci
7、fications E675,E676,orE677.3.4 GraduationThe graduated section shall be in compli-ance with Pattern I of Specification E694.4.Design4.1 Style I:4.1.1 Style I shall be in compliance with Table 1 and Fig.1.4.1.2 This style shall be equipped with a detachable tip witheither a 7/25 joint or a SJ 12/5 jo
8、int.4.1.3Reservoir and graduated section shall be secured toeach other to cushion against breakage during transit and inuse.Typical arrangements are a cork spacer and tape or a glassbridge.4.2 Style II:4.2.1 Style II shall be in compliance with Table 2 and Fig.2.4.2.2 This style shall be equipped wi
9、th a detachable tip ofnoble metals(platinum or platinum alloys)sealed to glass in aform commonly designated as Shohl-Type.4.2.3 Reservoir section shall be separate from graduatedsection with connection made by a SJ 12/5 spherical groundjoint complying with Specification E677.5.Sampling and Testing5.
10、1 See Specification E1157.6.Packaging6.1 Select one from ASTM Standards:Specifications E920,E921,and Practice E1133.7.Keywords7.1 buret;glass;Koch;laboratory;micro1This specification is under the jurisdiction of Committee E41 on LaboratoryLaboratory Apparatus and is the direct responsibility of Subc
11、ommittee E41.01 onLaboratory Ware and Supplies.Current edition approved Sept.1,2016.Published September 2016.Originallyapproved in 1987.Last previous edition approved in 2010 as E1189 00(2010).DOI:10.1520/E1189-00R16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM C
12、ustomer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 TABLE 1 Requirements For Style ICapacit
13、y,mLScaleLength,mmInsideDiameter,mmOutsideDiameter,mmOutflowTime,AsecondsTolerance,mL1.0 in 0.01250 to 3002.1 to 2.37.0 to 8.035 to 500.012.0 in 0.01250 to 3002.9 to 3.27.5 to 8.535 to 500.015.0 in 0.02450 to 5503.4 to 3.67.5 to 8.575 to 1000.025.0 in 0.01450 to 5503.4 to 3.67.5 to 8.575 to 1000.011
14、0.0 in 0.02500 to 6004.6 to 5.08.0 to 9.095 to 1150.02FIG.1 Koch Burretts,Style 1TABLE 2 Requirements For Style IICapacity,mLScaleLength,mmInsideDiameter,mmOutsideDiameter,mmOutflowTime,AsecondsTolerance,mL1.0 in 0.01135 to 1502.9 to 3.27.0 to 8.025 to 350.012.0 in 0.01250 to 3002.9 to 3.27.0 to 8.0
15、45 to 750.015.0 in 0.01450 to 5503.4 to 3.67.5 to 8.5105 to 1400.01AThe calibration tip shall deliver 100 to 110 drops per mL.E1189 00(2016)2 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this
16、 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 by 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.Yo
