1、Designation: E1293 02 (Reapproved 2012)Standard Specification forGlass Measuring Pipets1This standard is issued under the fixed designation E1293; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、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 measur-ing pipets of precision and general purpose grades, used inmeasuring volumes of liquid
3、s.2. Referenced Documents2.1 ASTM Standards:2E438 Specification for Glasses in Laboratory ApparatusE542 Practice for Calibration of Laboratory VolumetricApparatusE671 Specification for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory ApparatusE694 Specification for Laborator
4、y Glass 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
5、 and Testing of ReusableLaboratory GlasswareE1273 Specification for Color Coding of Reusable Labora-tory Pipets3. Classification3.1 Style, Class and CapacityPipets covered by this speci-fication shall be of the following styles, classes, and capacities:3.1.1 Style 1Standard taper tip.3.1.1.1 Class A
6、Each pipet of precision grade shall bemarked with the letter “A” to signify compliance with appli-cable construction and accuracy requirements in Table 1. Eachpipet may be marked with a permanent serial number at theoption of the manufacturer.3.1.1.2 Class BGeneral purpose pipets are of the samebasi
7、c design as Class A pipets. Volumetric tolerances for ClassB pipets shall be within twice the specified range allowed forClass A pipets. These pipets need not be marked with theirclass designation or serial number. See Table 1 for tolerancesand dimensional requirements.3.1.2 Style 2Long taper tip (C
8、lass B only).3.1.3 Capacities, (mL)0.1, 0.2, 0.5, 1, 2, 5, 10, 25, and 50.4. Design4.1 ShapeThe pipets shall be straight and of one-piececonstruction. Any cross section of a pipet taken in a planeperpendicular to the longitudinal axis shall be circular.4.2 Delivery TipsDelivery tips of Style 1 pipet
9、s shall bemade with a gradual taper of 15 to 30 mm for capacities up to5 mL inclusive, and 20 to 40 mm for 10 to 50 mL capacitypipets. Style 2 pipets shall have a taper at a distance of 50 to 65mm from the tip end. The end of the tip shall be perpendicularto the longitudinal axis of the pipet. A sud
10、den constriction atthe orifice shall not be acceptable. The outside edge of the tipshall be beveled slightly at the end, and the bevel shall beground or firepolished.4.3 Zero Graduation Line Position The distance from thetop end to the top graduation of all pipets (except for 0.5 mLpipets) shall be
11、not less than 90 mm; for 0.5 mL pipets thisdistance shall be not less than 80 mm.4.4 Dimensions and Outflow TimesThe limiting dimen-sions and outflow times are shown in Table 1. Outflow timesshall be determined on unplugged pipets using distilled waterat 256 5C and by means of a stopwatch. Outflow t
12、ime shallbe determined by the unrestricted outflow of the water from thezero mark to base mark and until the water has ceased to flow.4.5 MarkingsAll markings shall be permanent and leg-ible.4.5.1 Graduation MarkingsGraduation lines shall not ex-ceed 0.4 mm in thickness and shall be in a plane perpe
13、ndicularto the vertical axis of the pipet. The lines and other markingsshall be applied by one of the following methods: etched andfilled with a permanent pigment; etched through a verticalcolored stripe fused into the glass; by application of a stain1This specification is under the jurisdiction of
14、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 1989. Last previous edition approved in 2007 as E1293 02(2007).DOI: 10.1520/E1293-02R12.2For referenced
15、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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consho
16、hocken, PA 19428-2959. United States1fired into the glass without etching; or by application of anenamel fired onto the glass without etching.4.5.1.1 Style 1, Class A pipetsShall comply with thelengths of lines, numbering and Graduation Pattern 1 specifiedin Specification E694.4.5.1.2 Style 1, Class
17、 B and Style 2 pipetsMain gradua-tions shall extend a minimum of34 of the way around the pipet;intermediate graduations shall extend a minimum of15 of theway around the pipet, and the least graduation markings shallextend a minimum of17 of the way around the pipet. The valueof all main graduations s
18、hall be inscribed in Arabic numeralsdirectly above the line referenced.4.5.2 Color CodingEach pipet shall be marked with oneor two color bands as specified in Table 1. For color code datasee Specification E1273. Color bands do not have to becontinuous but may be broken as long as they cover 40 % oft
19、he circumference of the pipet. Colors must be bright anddistinct.4.5.3 Identification MarkingsEach pipet, marked by oneof the methods given in 4.5.1, shall show the manufacturersname or trademark, the nominal capacity, the temperature ofcalibration, 20C, and the word “delivers” or any of thefollowin
20、g symbols: TD, TD-EX, TD (EX), EX-TD, EX (TD)or EX.5. Workmanship, Finish and Appearance5.1 Pipets shall be free of defects which may distort theappearance of the liquid surface or may impair their service-ability.6. General Requirements6.1 Borosilicate GlassBorosilicate glass for pipets shallconfor
21、m to the glass requirements of Type 1, Class A or B ofSpecification E438.6.2 AnnealingThe maximum residual thermal stress shallconform to Specification E671, except that tempered tips ortempered tops, or both, may be supplied at the option of themanufacturer. The tempered tip, when examined in index
22、 oilthat matches the refractive index of the glass being used, shallhave a temper between 75 and 220 nm for Style 1 tips, andbetween 40 and 200 nm for Style 2 tips.6.3 CalibrationPipets shall be calibrated in accordancewith Practice E542, to deliver (TD) the intended capacity at20C.7. Sampling and T
23、esting7.1 For sampling and testing refer to Specification E1157.8. Packaging8.1 For packaging select from Specifications E920, E921,orPractice E1133.9. Keywords9.1 glass; measuring; pipetsTABLE 1 Requirements for Glass Measuring PipetsCapacitymLCapacity Tolerance mL Graduations, mL OutsideDiameter o
24、fGrad. Portionmin, mmOutflow Time SecondsColorCodingBandClass A Class B Least valueMainnumberedClass A Class Bmin max min max0.1 . 0.005 0.01 0.01 5.5 . . 0.5 10 White0.1A. 0.005 0.001 0.01 5.5 . . 0.5 10 2-Green0.2 . 0.008 0.01 0.02 5.5 . . 0.5 8 Black0.2A. 0.008 0.001 0.02 5.5 . . 0.5 8 2-Blue0.5A
25、. 0.01 0.01 0.10 6.0 . . 2 6 2-Yellow1.0 0.01 0.02 0.10 0.10 6.0 20 60 3 22 Red1.0 0.01 0.02 0.01 0.10 6.0 20 60 3 22 Yellow2.0 0.01 0.02 0.10 0.20 7.0 20 60 3 22 Green2.0A. 0.02 0.01 0.20 7.0 . . 3 22 2-White5.0 0.02 0.04 0.10 1.0 7.5 30 60 8 20 Blue10.0 0.03 0.06 0.10 1.0 9.5 30 60 8 30 Orange25.0
26、B0.05 0.10 0.10 1.0 12.0 40 70 15 35 White50.0B. 0.16 0.20 2.0 16.0 . . 20 40 BlackAStyle 2 only.BStyle 1 only.E1293 02 (2012)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are
27、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 re
28、vised, 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
29、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 S
30、tates. 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/).E1293 02 (2012)3
