1、Designation: E287 02 (Reapproved 2012)Standard Specification forLaboratory Glass Graduated Burets1This standard is issued under the fixed designation E287; 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 () 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 Class
3、 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 th
4、e 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 requirements
5、.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 glasswa
6、re 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 nex
7、t smaller volumetricstandard product listed in Table 1.2. Referenced Documents2.1 ASTM Standards:2D664 Test Method for Acid Number of Petroleum Productsby Potentiometric TitrationE675 Specification for Interchangeable Taper-Ground Stop-cocks And StoppersE911 Specification for Glass Stopcocks with Po
8、lytetrafluo-roethylene (PTFE) PlugsE920 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 Sa
9、mpling 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 cover
10、s 10, 25, 50 and 100-mLstraight burets with single-bore stopcock; 10, 25, 50 and100-mL straight burets with 3-way stopcock; 100-mL buretswith 50-mL bulb (intermediate bulb style); and 10, 25, 50 and100-mL self-zeroing burets.4.1.1 Self-zeroing burets shall have an ungraduated,tapered, interior exten
11、sion 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 slightly
12、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 ClassAburets, fill
13、ing 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 separate s
14、topcock 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, 2012. Published November 2012. Originallyapproved in 1965. Last previous edit
15、ion in 2007 as E287 02(2007). DOI:10.1520/E0287-02R12.2For 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.Copyrig
16、ht ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1the 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
17、 form of an elbow, extending 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 ClassAbure
18、ts or as an alternative 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 attachedstop
19、cocks. The stopcocks handle 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 SpecificationE675. The TFE-fluorocarbon plugs shall have tapers of 1 mmfor each 5 m
20、m of length and shall 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 St
21、emsThe delivery stem 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 MethodD664). The stem shall be permanently attached to the buret andshall be made with a gradual taper at the lower end of 20 to 30mm. The end of the tip
22、 shall be ground perpendicular to thelongitudinal axis of the tip and beveled, or it may be fire-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 l
23、ess thanthe times shown 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 par
24、allel to each other.Lines 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
25、application of an enamel 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) line
26、s shallextend completely 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 s
27、hall extend aminimum 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
28、lines shall extend aminimum 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 o
29、f calibration, that is, 20C, andthe time for unrestricted delivery of the total nominal volume.TABLE 1 Requirements for BuretsGraduated ScaleCapacity,mLSubdivision,mLClass Aand BClass AScale Length,mm0 to CapacityClass BScale Length,mm0 to CapacityDistance, Topof Buret to “0”Graduation,mmAClass Aand
30、 BNumberEach, mLClass AVolumetricTolerance,mLClass BVolumetricTolerance,mL10 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 100 2 0.10 0.20AStraight burets only, n
31、ot 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 70 160TABLE 3 Minimum Delivery Time for
32、Class B BuretUsing WaterCapacity, mLTime of Outflow Not LessThan, s10 2525 3050 50100 90E287 02 (Reapproved 2012)2The actual delivery time may vary from the marked deliverytime by 615 s, provided the actual time is greater than theminimum given in Table 2 or Table 3.5. Sampling and Testing5.1 For sa
33、mpling and testing, refer to Specification E1157.6. Packaging6.1 For packaging, select from Specification E920 or E921or Practice E1133.7. Keywords7.1 burets; glass; graduatedASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentio
34、nedin 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 by the responsible technical committee an
35、d 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 o
36、f 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 ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box
37、 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).E287 02 (Reapproved 2012)3
