ASTM E287-2002(2007) 781 Standard Specification for Laboratory Glass Graduated Burets《实验室玻璃分度滴定管的标准规范》.pdf

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1、Designation: E 287 02 (Reapproved 2007)Standard Specification forLaboratory Glass Graduated Burets1This standard is issued under the fixed designation E 287; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision

2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers requirements for glass buretsof precision and general-purpose grades suitable for laboratoryuse.1.1.1 Cl

3、ass AEach buret of precision grade may bemarked with the letter “A” to signify compliance with appli-cable construction and accuracy requirements in Table 1 andTable 2. Each buret may be marked with a permanent serialnumber at the option of the manufacturer.1.1.2 Class BGeneral purpose burets are of

4、 the same basicdesign as Class A burets. However, volumetric tolerances forClass B burets shall be within twice the specified range allowedfor Class A burets. These burets need not be marked with theirclass designation or serial number. See Table 1 and Table 3 fortolerances and dimensional requireme

5、nts.NOTE 1The Twelfth General (International) Conference on Weightsand Measures redefined the litre as a “special name for the cubicdecimetre,” but agreed to permit continuance of the terms litre, millilitre,and mL, except in association with measurements of the highest precision.For volumetric glas

6、sware the difference between the old and newmeanings of litre is negligible. Therefore, either mL or cm3may bemarked on ware covered by this standard.1.1.3 Product with a stated capacity not listed in thisstandard may be specified Class A Tolerance when productconforms to the tolerance range of the

7、next smaller volumetricstandard product listed in Table 1.2. Referenced Documents2.1 ASTM Standards:2D 664 Test Method forAcid Number of Petroleum Productsby Potentiometric TitrationE 675 Specification for Interchangeable Taper-GroundStopcocks And StoppersE911 Specification for Glass Stopcocks with

8、Polytetrafluo-roethylene (PTFE) PlugsE 920 Specification for Commercially Packaged LaboratoryApparatusE 921 Specification for Export Packaged Laboratory Appa-ratusE 1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus for United States Government Procure-mentsE 1157 Specification

9、for Sampling and Testing of ReusableLaboratory Glassware3. General Requirements3.1 CalibrationBurets shall be calibrated to deliver theintended volume at 20C. No after-drainage period is allowed.Volumetric tolerances shall be within the limits specified inTable 1.4. Design4.1 ShapeThis specification

10、 covers 10, 25, 50 and100-mL straight burets with single-bore stopcock; 10, 25, 50and 100-mL straight burets with 3-way stopcock; 100-mLburets with 50-mL bulb (intermediate bulb style); and 10, 25,50 and 100-mL self-zeroing burets.4.1.1 Self-zeroing burets shall have an ungraduated, ta-pered, interi

11、or extension that terminates with an overfloworifice. The exterior of the buret shall extend reasonablybeyond the terminal point of the interior overflow orifice. Anexterior outlet tube positioned below the overflow orifice shallalso be provided for drainage of overflow. End of outlet tubeshall be s

12、lightly enlarged and bulbous for attachment to flexibletubing.4.1.2 A cross section of the graduated portion of all buretstyles taken in a plane perpendicular to their longitudinal axisshall be circular.4.2 Filling TubeBurets may be equipped with a fillingtube as described below.4.2.1 For ClassAbure

13、ts, filling tubes may either be attachedto the underside of a 3-way stopcock or mounted onto thelower ungraduated body of those burets having straight borestopcocks. Filling tubes which are mounted onto the body ofClassAburets must utilize a separate stopcock integral with thefilling tube. When a se

14、parate stopcock is used, positioning of1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onApparatus.Current edition approved Nov. 1, 2007. Published December 2007. Originallyapproved in 1965. Last previ

15、ous edition in 2002 as E 287 022For 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.1Copyright ASTM International,

16、 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.the stopcock must be oriented so that the handle of thestopcock plug is readily accessible when buret is in normalviewing position.4.2.2 Filling tubes attached to 3-way stopcocks shall be inthe form of an elbow, ext

17、ending downward from the stopcock.The open end of the filling tube shall extend toward the rearfrom the buret and be slightly enlarged or bulbous for firmlysecuring flexible tubing.4.2.3 Class B burets may have filling tubes affixed in any ofthe methods described for ClassAburets or as an alternativ

18、e beattached to the lower ungraduated portion of buret bodywithout an integral stopcock.4.3 Dimensions and TolerancesBurets shall comply withthe essential dimensions and tolerances shown in Table 1,Table 2, and Table 3.4.4 StopcocksAll burets shall have permanently attachedstopcocks. The stopcocks h

19、andle shall be located to the right.Stopcock plugs shall be provided with a retaining device.Stopcock plugs may be either glass or TFE-fluorocarbon.All-glass stopcocks shall conform to size 2 of SpecificationE 675. The TFE-fluorocarbon plugs shall have tapers of 1 mmfor each 5 mm of length and shall

20、 conform to the requirementsof Specification E911.4.4.1 In addition, stopcocks that form a seal by having theirTFE-fluorocarbon plug ends butt against a necked-down glassshell may be used, provided thata4mmmaximum insidediameter is used for the necked-down region.4.5 Delivery StemsThe delivery stem

21、shall have a totallength of 70 6 5 mm, except for the 10-mL size which mayhave a stem 100 to 130 mm long (to comply with Test MethodD 664). The stem shall be permanently attached to the buretand shall be made with a gradual taper at the lower end of 20to 30 mm. The end of the tip shall be ground per

22、pendicular tothe longitudinal axis of the tip and beveled, or it may befire-polished instead of grinding. A sudden constriction at theorifice shall not be acceptable.4.6 Delivery TimeThe rate of outflow shall be restrictedby the size of the opening in the tip, and shall be not less thanthe times sho

23、wn in Table 2 for Class A burets and Table 3 forClass B burets.4.7 MarkingsAll markings shall be permanent and leg-ible.4.7.1 Calibration LinesCalibration lines shall be sharplydefined and of uniform width (maximum 0.4 mm) in a planeperpendicular to the axis of the buret and parallel to each other.L

24、ines shall be spaced at least 1 mm apart, center to center oflines. All main lines shall be numbered. Lines and numbersshall be applied by one of these methods: etched and filled withpermanent pigment, by application of a stain that is fired intothe glass without etching, or by application of an ena

25、mel whichis fused on the glass without etching.4.7.1.1 Class ALeast calibration lines shall extend aminimum of one half and intermediate lines at least two thirds,respectively, of the way around the outside circumference ofthe buret. If lines are etched, the main (numbered) lines shallextend complet

26、ely around the circumference of the buret; iflines are of stain or enamel, a gap is permitted in the main linesimmediately to the right of the numbers. The gap shall notexceed 4 mm for 10 and 25-mL burets, and 7 mm for 50 and100-mL burets.4.7.1.2 Class BLeast calibration lines shall extend aminimum

27、of one sixth and intermediate lines at least onefourth, respectively, of the way around the outside circumfer-ence of the buret. If lines are etched, the main (numbered) linesshall extend completely around the circumference of the buret;if lines are of stain or enamel, the main lines shall extend am

28、inimum of three fourths of the way around the outsidecircumference of the buret.4.7.2 Identification MarkingsEach buret, marked by oneof the methods given in 4.7.1, shall show the manufacturersname or trademark, the word “Delivers” or the equivalentsymbol “TD,” the temperature of calibration, that i

29、s, 20C, andthe time for unrestricted delivery of the total nominal volume.The actual delivery time may vary from the marked deliveryTABLE 1 Requirements for BuretsGraduated ScaleCapacity,mLSubdivision,mLClass Aand BClass AScale Length,mm0 to CapacityClass BScale Length,mm0 to CapacityDistance, Topof

30、 Buret to “0”Graduation,mmAClass Aand BNumberEach, mLClass AVolumetricTolerance,6mLClass BVolumetricTolerance,6mL10 0.05 350 to 450 250 to 450 30 to 75 0.5 0.02 0.0425 0.1 350 to 450 250 to 450 30 to 75 1 0.03 0.0650 0.1 500 to 600 500 to 600 40 to 100 1 0.05 0.10100 0.2 550 to 650 550 to 650 40 to

31、100 2 0.10 0.20AStraight burets only, not applicable to self-zeroing burets.TABLE 2 Minimum Delivery Time for Class A BuretsUsing WaterLengthGraduated,cmTime of Out-flow NotLess Than, sLengthGraduated,cmTime of Out-flow Not LessThan, s15 30 45 8020 35 50 9025 40 55 10530 50 60 12035 60 65 14040 70 7

32、0 160TABLE 3 Minimum Delivery Time for Class B BuretUsing WaterCapacity, mLTime of Outflow Not LessThan, s10 2525 3050 50100 90E 287 02 (2007)2time by 6 15 s, provided the actual time is greater than theminimum given in Table 2 or Table 3.5. Sampling and Testing5.1 For sampling and testing, refer to

33、 Specification E 1157.6. Packaging6.1 For packaging, select from Specification E 920 or E 921or Practice E 1133.7. Keywords7.1 burets; glass; graduatedASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Use

34、rs 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 by the responsible technical committee and must be reviewed every

35、 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 technic

36、al committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).E 287 02 (2007)3