ASTM E1293-02(2019)

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:E1293 −02 (Reapproved 2019)
Standard Specification for
Glass Measuring Pipets
This standard is issued under the fixed designation E1293; 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. Classification
3.1 Style, Class, and Capacity—Pipets covered by this
1.1 This specification covers requirements for glass measur-
specification shall be of the following styles, classes, and
ing pipets of precision and general purpose grades, used in
capacities:
measuring volumes of liquids.
3.1.1 Style 1—Standard taper tip.
1.2 This international standard was developed in accor-
3.1.1.1 Class A—Each pipet of precision grade shall be
dance with internationally recognized principles on standard-
marked with the letter “A” to signify compliance with appli-
ization established in the Decision on Principles for the
cable construction and accuracy requirements in Table 1. Each
Development of International Standards, Guides and Recom-
pipet may be marked with a permanent serial number at the
mendations issued by the World Trade Organization Technical
option of the manufacturer.
Barriers to Trade (TBT) Committee.
3.1.1.2 Class B—General purpose pipets are of the same
basic design as ClassApipets. Volumetric tolerances for Class
2. Referenced Documents B pipets shall be within twice the specified range allowed for
Class A pipets. These pipets need not be marked with their
2.1 ASTM Standards:
class designation or serial number. See Table 1 for tolerances
E438 Specification for Glasses in Laboratory Apparatus
and dimensional requirements.
E542 Practice for Calibration of Laboratory Volumetric
3.1.2 Style 2—Long taper tip (Class B only).
Apparatus
3.1.3 Capacities, (mL)—0.1, 0.2, 0.5, 1, 2, 5, 10, 25, and 50.
E671 Specification for Maximum Permissible Thermal Re-
sidual Stress in Annealed Glass Laboratory Apparatus
4. Design
E694 Specification for Laboratory Glass Volumetric Appa-
4.1 Shape—The pipets shall be straight and of one-piece
ratus
construction. Any cross section of a pipet taken in a plane
E920 Specification for Commercially Packaged Laboratory
perpendicular to the longitudinal axis shall be circular.
Apparatus
4.2 Delivery Tips—Delivery tips of Style 1 pipets shall be
E921 Specification for Export Packaged Laboratory Appa-
made with a gradual taper of 15 to 30 mm for capacities up to
ratus
5 mL inclusive, and 20 to 40 mm for 10 to 50 mL capacity
E1133 Practice for Performance Testing of Packaged Labo-
pipets. Style 2 pipets shall have a taper at a distance of 50 to
ratory Apparatus for United States Government Procure-
65 mm from the tip end. The end of the tip shall be perpen-
ments
dicular to the longitudinal axis of the pipet.Asudden constric-
E1157 Specification for Sampling and Testing of Reusable
tion at the orifice shall not be acceptable. The outside edge of
Laboratory Glassware
the tip shall be beveled slightly at the end, and the bevel shall
E1273 Specification for Color Coding of Reusable Labora-
be ground or firepolished.
tory Pipets
4.3 Zero Graduation Line Position— The distance from the
top end to the top graduation of all pipets (except for 0.5 mL
pipets) shall be not less than 90 mm; for 0.5 mL pipets this
This specification is under the jurisdiction of ASTM Committee E41 on
distance shall be not less than 80 mm.
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
Laboratory Ware and Supplies.
4.4 Dimensions and Outflow Times—The limiting dimen-
Current edition approved Jan. 1, 2019. Published February 2019. Originally
sions and outflow times are shown in Table 1. Outflow times
approved in 1989. Last previous edition approved in 2012 as E1293 – 02(2012).
DOI: 10.1520/E1293-02R19.
shall be determined on unplugged pipets using distilled water
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
at 256 5 °C and by means of a stopwatch. Outflow time shall
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
be determined by the unrestricted outflow of the water from the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. zero mark to base mark and until the water has ceased to flow.
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E1293−02 (2019)
TABLE 1 Requirements for Glass Measuring Pipets
Capacity Tolerance± mL Graduations, mL Outside Outflow Time Seconds
Color
Capacity Diameter of
Class A Class B Cod
...