1、Designation: E 1293 02Standard Specification forGlass Measuring Pipets1This standard is issued under the fixed designation E 1293; 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 parentheses i
2、ndicates 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 measur-ing pipets of precision and general purpose grades, used inmeasuring volumes of liquids.2. Referenced
3、 Documents2.1 ASTM Standards:E 438 Specification for Glasses in Laboratory Apparatus2E 542 Practice for Calibration of Volumetric Apparatus2E 671 Specification for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory Apparatus2E 694 Specification for Volumetric Ware2E 920 Specif
4、ication for Commercially Packaged LaboratoryApparatus2E 921 Specification for Export Packaged Laboratory Appa-ratus2E 1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus United States Government Procurement2E 1157 Specification for Sampling and Testing ReusableLaboratory Glasswar
5、e2E 1273 Specification for Color Coding of Reusable Labo-ratory Pipets23. Classification3.1 Style, Class and CapacityPipets covered by thisspecification shall be of the following styles, classes, andcapacities:3.1.1 Style 1Standard taper tip.3.1.1.1 Class AEach pipet of precision grade shall bemarke
6、d 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 samebasic design as Class A pipets. Volumetric tole
7、rances 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 (Class B only).3.1.3 Capacities, (mL)0.1, 0.2
8、, 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 pipets shall bemade with a gradual taper of 15 t
9、o 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 sudden constriction atthe orifice shall not be
10、 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 not less than 90 mm; for 0.5 mL pipets this
11、distance 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 time shallbe determined by the unrestricted
12、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 perpendicularto the vertical axis of the pipet.
13、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 stainfired into the glass without etching; or by application of anenamel fired onto the glass wit
14、hout etching.4.5.1.1 Style 1, Class A pipetsShall comply with thelengths of lines, numbering and Graduation Pattern 1 specifiedin Specification E 694.1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onG
15、lass Apparatus.Current edition approved Oct. 10, 2002. Published January 2003. Originallypublished as E 1293 89. Last previous edition E 1293 94(1998).2Annual Book of ASTM Standards, Vol 14.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United
16、 States.4.5.1.2 Style 1, Class 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
17、valueof all main graduations shall 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 E 1273. Color bands do not have to becontinuous but may be broken
18、 as long as they cover 40 % ofthe 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 “
19、delivers” or any of thefollowing 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 GlassBorosilica
20、te glass for pipets shallconform to the glass requirements of Type 1, Class A or B ofSpecification E 438.6.2 AnnealingThe maximum residual thermal stress shallconform to Specification E 671, except that tempered tips ortempered tops, or both, may be supplied at the option of themanufacturer. The tem
21、pered tip, when examined in index 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 E 542, to deliver (TD) the intende
22、d capacity at20C.7. Sampling and Testing7.1 For sampling and testing refer to Specification E 1157.8. Packaging8.1 For packaging select from Specifications E 920, E 921,or Practice E 1133.9. Keywords9.1 glass; measuring; pipetsASTM International takes no position respecting the validity of any paten
23、t rights 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 a
24、t 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. Your commen
25、ts 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 ASTM Committee on Standards, at the address shown below.This standard is copyrighted
26、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-mai
27、l); or through the ASTM website(www.astm.org).TABLE 1 Requirements for Glass Measuring PipetsCapacitymLCapacity Tolerance6 mL Graduations, mL OutsideDiameter ofGrad. Portionmin, mmOutflow Time SecondsColorCodingBandClass A Class B Least valueMainnumberedClass A Class Bmin max min max0.1 . 0.005 0.01
28、 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. 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 Orange25.0B0.05 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.E1293022
