1、Designation: E 969 02Standard Specification forGlass Volumetric (Transfer) Pipets1This standard is issued under the fixed designation E 969; 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 par
2、entheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 twoclasses. Class A
3、, Precision Pipet and Class B, General Purpose.NOTE 1Specifications for micropipets are given in SpecificationE 193.1.2 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 standardprod
4、uct listed in Table 1.2. Referenced Documents2.1 ASTM Standards:E 193 Specification for Micropipets2E 438 Specification for Glasses in Laboratory Apparatus2E 542 Practice for Calibration of Volumetric Apparatus2E 694 Specification for Laboratory Volumetric Apparatus2E 920 Specification for Commercia
5、lly Packaged LaboratoryApparatus2E 921 Specification for Export Packaged Laboratory Appa-ratus2E 1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus for United States Government Procure-ments2E 1157 Specification for the Sampling and Testing of Reus-able Laboratory Glassware23. G
6、eneral Requirements3.1 Borosilicate GlassBorosilicate glass for pipets shallconform to the glass requirements of Type 1, Class A or B ofSpecification E 438.3.2 CalibrationPipets shall be calibrated to deliver (sym-bol TD) the intended capacity at 20C. The pipet shall be filledabout 20 mm above the c
7、apacity line. The water is loweredslowly to the capacity line. Delivery of the contents into areceiving 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 shal
8、l consist in general of a suctiontube and a delivery tube separated by a bulb; all three partsshall 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.
9、4.1.1 BulbThe shape shall permit complete emptyingwithout any hold up, and easy cleaning.4.2 DimensionsThe length of the suction tube shall be150 to 190 mm and the minimum wall thickness of bothsuction and delivery tubes shall be 0.90 mm. Pipets mustcomply with the essential dimensions given in Tabl
10、e 1.4.3 Delivery TipsDelivery tips shall be made with agradual taper of 1.5 to 3 cm. The end of the 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
11、orifice would impair smooth flow characteristics of thedelivery stream and is not acceptable.4.3.1 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 (
12、millimicrons).4.4 MarkingsAll markings shall be permanent and leg-ible.4.4.1 Capacity LineThe capacity 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
13、 filled witha permanent pigment; etched through a vertical colored stripefused into the glass; by application 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
14、 fired into the glass withoutetching. If so stained, the line shall extend a minimum of 90 %of the 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 approv
15、ed Oct. 10, 2002. Published November 2002. Originallypublished as E 969 83. Last previous edition E 969 95(1999).2Annual Book of ASTM Standards, Vol 14.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.4.2 Color CodingEach pipet s
16、hall 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 wide 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 t
17、he circumferenceof the pipet. Colors must be bright and distinct.4.4.3 Identification MarkingsEach pipet marked by oneof the methods given in 4.4.1 shall show the manufacturersname or trademark, the nominal capacity, the word “delivers”or the symbol “TD,” the temperature of calibration, 20C. Thelett
18、er “A” symbolizing Class A accuracy to appear on all ClassA pipets. Class A pipets may be optionally serialized.4.5 WorkmanshipPipets shall be free of defects whichmay distort the appearance of the liquid surface or may impairthe serviceability.5. Sampling and Testing5.1 For sampling refer to Specif
19、ication E 1157.6. Packaging6.1 For packaging, select from Specifications E 920, E 921,or Practice E 1133.7. Keywords7.1 glass; pipets; volumetricASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of
20、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 five
21、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 technical com
22、mittee, 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 1
23、9428-2959,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).TABLE 1 Requirements for Volumetric
24、(Transfer) PipetNominalCapacity,mLCapacity Tolerance,mLLength 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 60.006 60.012 100 140 1.3 4 60 5 3 black (
25、2)1 60.006 60.012 100 140 2 4 60 8 3 blue2 60.006 60.012 120 150 2 4 60 8 3 orange3 60.01 60.02 130 170 2 4 60 8 5 black4 60.01 60.02 130 170 2 4 60 8 5 red (2)5 60.01 60.02 130 170 2 4 60 8 8 white6 60.01 60.03 150 190 2 4 60 10 8 orange (2)7 60.01 60.03 150 190 2 4 60 10 8 green (2)8 60.02 60.04 1
26、50 190 2 4 60 10 8 blue9 60.02 60.04 150 190 2 4 60 10 8 black10 60.02 60.04 150 190 2 4 70 15 8 red15 60.03 60.06 180 220 3.5 5.5 70 25 10 green20 60.03 60.06 230 260 3.5 5.5 70 25 10 yellow25 60.03 60.06 230 260 3.5 5.5 70 25 15 blue30 60.03 . 230 260 3.5 5.5 70 25 . black40 60.05 . 230 260 4 6 70 25 . white50 60.05 60.10 230 260 4 6 70 25 15 red100 60.08 60.16 230 260 5 7 80 30 20 yellowAMaximum outflow time for A or B shall be 60 s.E969022
