ASTM E1293-02(2012)
(Specification)Standard Specification for Glass Measuring Pipets
Standard Specification for Glass Measuring Pipets
ABSTRACT
This specification covers requirements of precision (Class A) and general purpose (Class B) grade glass measuring pipets used for volume measurement of liquids. Pipets covered by this specification may be of the standard taper tip type (Style 1) or of the long taper tip type (Style 2), which is only available for Class B pipets, and are available in nine different capacities. The pipet shall be manufactured from annealed borosilicate glass into a straight, one-piece construction that is free of defects which may distort the appearance of the liquid surface. The pipets shall be marked wit permanent and legible graduation lines lying in a plane perpendicular to the vertical axis of the pipet by etching the glass and filling the etched area with a permanent pigment, by etching through a vertical colored stripe fused into the glass, by applying a stain fired into the glass without etching, or by applying an enamel fired into the glass without etching. In addition, the pipet shall also be color coded with one or two color bands. Pipets shall undergo testing such as specified for reusable laboratory glassware.
SCOPE
1.1 This specification covers requirements for glass measuring pipets of precision and general purpose grades, used in measuring volumes of liquids.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:E1293 −02 (Reapproved 2012)
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 pipet may be marked with a permanent serial number at the
option of the manufacturer.
1.1 This specification covers requirements for glass measur-
3.1.1.2 Class B—General purpose pipets are of the same
ing pipets of precision and general purpose grades, used in
basic design as ClassApipets. Volumetric tolerances for Class
measuring volumes of liquids.
B pipets shall be within twice the specified range allowed for
Class A pipets. These pipets need not be marked with their
2. Referenced Documents
class designation or serial number. See Table 1 for tolerances
2.1 ASTM Standards:
and dimensional requirements.
E438 Specification for Glasses in Laboratory Apparatus
3.1.2 Style 2—Long taper tip (Class B only).
E542 Practice for Calibration of Laboratory Volumetric
3.1.3 Capacities, (mL)—0.1, 0.2, 0.5, 1, 2, 5, 10, 25, and 50.
Apparatus
E671 Specification for Maximum Permissible Thermal Re-
4. Design
sidual Stress in Annealed Glass Laboratory Apparatus
4.1 Shape—The pipets shall be straight and of one-piece
E694 Specification for Laboratory Glass Volumetric Appa-
construction. Any cross section of a pipet taken in a plane
ratus
perpendicular to the longitudinal axis shall be circular.
E920 Specification for Commercially Packaged Laboratory
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 65
ratory Apparatus for United States Government Procure-
mm from the tip end. The end of the tip shall be perpendicular
ments
to the longitudinal axis of the pipet. A sudden constriction at
E1157 Specification for Sampling and Testing of Reusable
the orifice shall not be acceptable. The outside edge of the tip
Laboratory Glassware
shall be beveled slightly at the end, and the bevel shall be
E1273 Specification for Color Coding of Reusable Labora-
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
3. Classification
pipets) shall be not less than 90 mm; for 0.5 mL pipets this
3.1 Style, Class and Capacity—Pipets covered by this speci-
distance shall be not less than 80 mm.
fication shall be of the following styles, classes, and capacities:
4.4 Dimensions and Outflow Times—The limiting dimen-
3.1.1 Style 1—Standard taper tip.
sions and outflow times are shown in Table 1. Outflow times
3.1.1.1 Class A—Each pipet of precision grade shall be
shall be determined on unplugged pipets using distilled water
marked with the letter “A” to signify compliance with appli-
at 256 5°C and by means of a stopwatch. Outflow time shall
cable construction and accuracy requirements in Table 1. Each
be determined by the unrestricted outflow of the water from the
zero mark to base mark and until the water has ceased to flow.
This specification is under the jurisdiction of ASTM Committee E41 on 4.5 Markings—All markings shall be permanent and leg-
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
ible.
Apparatus.
4.5.1 Graduation Markings—Graduation lines shall not ex-
Current edition approved Nov. 1, 2012. Published November 2012. Originally
ceed 0.4 mm in thickness and shall be in a plane perpendicular
approved in 1989. Last previous edition approved in 2007 as E1293 – 02(2007).
DOI: 10.1520/E1293-02R12.
to the vertical axis of the pipet. The lines and other markings
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
shall be applied by one of the following methods: etched and
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
filled with a permanent pigment; etched through a vertical
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. colored stripe fused into the glass; by application of a stain
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