ASTM E1044-96(2024)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E1044 − 96 (Reapproved 2024)
Standard Specification for
Glass Serological Pipets (General Purpose and Kahn)
This standard is issued under the fixed designation E1044; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.3 Style III—Cotton plugging top end, large tip opening.
3.1.4 Capacities (mL)—0.1; 0.1 (Kahn); 0.2; 0.2 (Kahn);
1.1 This specification covers glass serological pipets, used
0.25 (Kahn); 0.5; 0.60 (Kahn); 1.0; 2.0; 5.0; 10.0; and 25.0.
in measuring volumes of liquids.
1.2 This international standard was developed in accor-
4. General Requirements
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4.1 Borosilicate Glass—Borosilicate glass for pipets shall
Development of International Standards, Guides and Recom-
conform to the glass requirements of Type 1, Class A or B of
mendations issued by the World Trade Organization Technical
Specification E438.
Barriers to Trade (TBT) Committee.
4.2 Calibration—Pipets shall be calibrated in accordance
2. Referenced Documents with Practice E542 to deliver (TD) the intended capacity of
distilled water at 20 °C when the last drop is blown out, except
2.1 ASTM Standards:
the 0.25 mL Kahn pipet; this Kahn pipet shall have a clear
E438 Specification for Glasses in Laboratory Apparatus
ungraduated space of not less than 63 mm between the
E542 Practice for Gravimetric Calibration of Laboratory
lowermost graduation mark and the tip of the pipet. The pipet
Volumetric Instruments
shall be filled about 10 mm above the capacity line. Remove
E671 Specification for Maximum Permissible Thermal Re-
any water on the outside of the tip by a downward wipe with
sidual Stress in Annealed Glass Laboratory Apparatus
filter paper. Next, place the tip in contact with the wetted wall
E694 Specification for Laboratory Glass Volumetric Appa-
of a beaker and slowly lower the meniscus to the capacity line.
ratus
Do not remove any water remaining on the tip at this time.
E920 Specification for Commercially Packaged Laboratory
Delivery of the contents into a receiving vessel is made with
Apparatus
the tip in contact with the wall of the vessel. When the water
E921 Specification for Export Packaged Laboratory Appa-
has ceased to flow, the water remaining in the tip is then blown
ratus
out with one firm puff with the tip in contact with the wall of
E1133 Practice for Performance Testing of Packaged Labo-
the vessel, if possible. No after-drainage period is allowed.
ratory Apparatus for United States Government Procure-
Capacity tolerances shall be within the limits given in Table 1.
ments
E1157 Specification for Sampling and Testing of Reusable
4.3 Annealing—The maximum residual thermal stress shall
Laboratory Glassware
be such as to conform to Specification E671, except that
tempered tips or tempered tops, or both, may be supplied at the
3. Classification
option of the manufacturer. The tempered tip, when examined
3.1 Style and Capacity—Pipets covered by this specification
in index oil that matches the refractive index of the glass being
shall be of the following styles and capacities:
used, shall have a temper between 75 nm and 220 nm.
3.1.1 Style I—General purpose top end.
3.1.2 Style II—Cotton plugging top end.
5. Design
5.1 Shape—The pipets shall be straight and of one-piece
This specification is under the jurisdiction of ASTM Committee E41 on
construction. Any cross section of a pipet taken in a plane
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
perpendicular to the longitudinal axis shall be circular.
Laboratory Ware and Supplies.
Current edition approved Feb. 1, 2024. Published February 2024. Originally
5.2 Delivery Tips—Delivery tips shall be made with a
approved in 1985. Last previous edition approved in 2018 as E1044 – 96 (2018).
DOI: 10.1520/E1044-96R24.
gradual taper of 15 mm to 30 mm for capacities up to 5 mL
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
inclusive, and 20 mm to 35 mm for 10 mL and 25 mL capacity
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
pipets. The end of the tip shall be perpendicular to the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. longitudinal axis of the pipet. Sudden constriction at the orifice
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E1044 − 96 (2024)
TABLE 1 Requirements for Glass Serological Pipets
Capacity Graduations, mL Outside
Style I and I
...