1、Designation: E969 02 (Reapproved 2012)Standard Specification forGlass Volumetric (Transfer) Pipets1This standard is issued under the fixed designation E969; 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers volumetric pipets of twoc
3、lasses. ClassA, Precision Pipet and Class B, General Purpose.NOTE 1Specifications for micropipets are given in SpecificationE193.1.2 Product with a stated capacity not listed in this standardmay be specified class A tolerance when product conforms tothe tolerance range of the next smaller volumetric
4、 standardproduct listed in Table 1.2. Referenced Documents2.1 ASTM Standards:2E193 Specification for Laboratory Glass MicropipetsE438 Specification for Glasses in Laboratory ApparatusE920 Specification for Commercially Packaged LaboratoryApparatusE921 Specification for Export Packaged Laboratory App
5、a-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 Borosilicate GlassBorosilicate glass for pipets shallconform to the glass r
6、equirements of Type 1, Class A or B ofSpecification E438.3.2 CalibrationPipets shall be calibrated to deliver (sym-bol TD) the intended capacity at 20C. The pipet shall be filledabout 20 mm above the capacity line. The water is loweredslowly to the capacity line. Delivery of the contents into arecei
7、ving vessel is made with the tip in contact with the wall ofthe vessel and no after-drainage period is allowed. Accuracyshall be within the limits specified in Table 1.4. Design4.1 ShapeThe pipets shall consist in general of a suctiontube and a delivery tube separated by a bulb; all three partsshall
8、 be permanently attached together. Any cross-section ofthe pipet taken in a plane perpendicular to the longitudinal axisshall be circular. The shape shall permit complete emptyingand thorough cleaning.4.1.1 BulbThe shape shall permit complete emptyingwithout any hold up, and easy cleaning.4.2 Dimens
9、ionsThe length of the suction tube shall be 150to 190 mm and the minimum wall thickness of both suction anddelivery tubes shall be 0.90 mm. Pipets must comply with theessential dimensions given in Table 1.4.3 Delivery TipsDelivery tips shall be made with agradual taper of 1.5 to 3 cm. The end of the
10、 tip shall beperpendicular to the longitudinal axis of the tip. The outsideedge of the tip may be bevelled slightly and the end and thebevel shall be ground or fire-polished. Sudden constriction atthe orifice would impair smooth flow characteristics of thedelivery stream and is not acceptable.4.3.1
11、Tempered TipsMay be supplied at option of manu-facturer. The tempered tip, when tested in index oil whichmatches the refractive index of the glass being used, shall havea temper between 75 and 220 nm (millimicrons).4.4 MarkingsAll markings shall be permanent and leg-ible.4.4.1 Capacity LineThe capac
12、ity line shall be a sharplydefined line of uniform width (maximum 0.6 mm) in a planeperpendicular to the vertical axis of the pipet. The line shall beapplied by one of the following methods: etched and filled witha permanent pigment; etched through a vertical colored stripefused into the glass; by a
13、pplication of a stain fired into the glasswithout etching; or by application of an enamel fired onto theglass without etching. The line shall completely encircle thetube except when the line is a stain fired into the glass withoutetching. If so stained, the line shall extend a minimum of 90 %of the
14、way around the tube.1This 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 1983. Last previous edition approve
15、d in 2007 as E969 02(2007). DOI:10.1520/E0969-02R12.2For 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.Copyright
16、 ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.4.2 Color CodingEach pipet shall be marked with oneor two color bands as specified in Table 1. The single bandshould be 6 to 10 mm wide, while the double color bandsshould each be 3 to 5 mm wid
17、e and separated by a clear spaceof 2 to 3 mm. Color bands do not have to be continuous butmay be broken as long as they cover 40 % of the circumferenceof the pipet. Colors must be bright and distinct.4.4.3 Identification MarkingsEach pipet marked by one ofthe methods given in 4.4.1 shall show the ma
18、nufacturers nameor trademark, the nominal capacity, the word “delivers” or thesymbol “TD,” the temperature of calibration, 20C. The letter“A” symbolizing Class A accuracy to appear on all Class Apipets. Class A pipets may be optionally serialized.4.5 WorkmanshipPipets shall be free of defects whichm
19、ay distort the appearance of the liquid surface or may impairthe serviceability.5. Sampling and Testing5.1 For sampling refer to Specification E1157.6. Packaging6.1 For packaging, select from Specifications E920, E921,or Practice E1133.7. Keywords7.1 glass; pipets; volumetricASTM International takes
20、 no position respecting the validity of any patent 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 resp
21、onsibility.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 addresse
22、d to ASTM International Headquarters. Your comments 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
23、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 (phon
24、e), 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/).TABLE 1 Requirements for Volumetric (Transfer) PipetNominalCapacity,mLCapacity Tolerance,mLL
25、ength of Delivery Tube,mmInside Diameter atCapacity Mark, mmMaximum DistanceBetween Bulb andGraduation Mark, mmMinimum OutflowTime, sA Color-CodingBandClass A Class B min max min max Class A Class B0.5 0.006 0.012 100 140 1.3 4 60 5 3 black (2)1 0.006 0.012 100 140 2 4 60 8 3 blue2 0.006 0.012 120 1
26、50 2 4 60 8 3 orange3 0.01 0.02 130 170 2 4 60 8 5 black4 0.01 0.02 130 170 2 4 60 8 5 red (2)5 0.01 0.02 130 170 2 4 60 8 8 white6 0.01 0.03 150 190 2 4 60 10 8 orange (2)7 0.01 0.03 150 190 2 4 60 10 8 green (2)8 0.02 0.04 150 190 2 4 60 10 8 blue9 0.02 0.04 150 190 2 4 60 10 8 black10 0.02 0.04 1
27、50 190 2 4 70 15 8 red15 0.03 0.06 180 220 3.5 5.5 70 25 10 green20 0.03 0.06 230 260 3.5 5.5 70 25 10 yellow25 0.03 0.06 230 260 3.5 5.5 70 25 15 blue30 0.03 . 230 260 3.5 5.5 70 25 . black40 0.05 . 230 260 4 6 70 25 . white50 0.05 0.10 230 260 4 6 70 25 15 red100 0.08 0.16 230 260 5 7 80 30 20 yellowAMaximum outflow time for A or B shall be 60 s.E969 02 (2012)2
