ASTM E969-02

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: E 969 – 02
Standard Specification for
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Glass Volumetric (Transfer) Pipets
This standard is issued under the fixed designation E 969; 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 (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. Scope receiving vessel is made with the tip in contact with the wall of
the vessel and no after-drainage period is allowed. Accuracy
1.1 This specification covers volumetric pipets of two
shall be within the limits specified in Table 1.
classes. ClassA, Precision Pipet and Class B, General Purpose.
NOTE 1—Specifications for micropipets are given in Specification 4. Design
E 193.
4.1 Shape—The pipets shall consist in general of a suction
1.2 Product with a stated capacity not listed in this standard
tube and a delivery tube separated by a bulb; all three parts
may be specified class A tolerance when product conforms to
shall be permanently attached together. Any cross-section of
the tolerance range of the next smaller volumetric standard
the pipet taken in a plane perpendicular to the longitudinal axis
product listed in Table 1.
shall be circular. The shape shall permit complete emptying
and thorough cleaning.
2. Referenced Documents
4.1.1 Bulb—The shape shall permit complete emptying
2.1 ASTM Standards:
without any hold up, and easy cleaning.
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E 193 Specification for Micropipets
4.2 Dimensions—The length of the suction tube shall be
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E 438 Specification for Glasses in Laboratory Apparatus
150 to 190 mm and the minimum wall thickness of both
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E 542 Practice for Calibration of Volumetric Apparatus
suction and delivery tubes shall be 0.90 mm. Pipets must
2
E 694 Specification for Laboratory Volumetric Apparatus
comply with the essential dimensions given in Table 1.
E 920 Specification for Commercially Packaged Laboratory
4.3 Delivery Tips—Delivery tips shall be made with a
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Apparatus
gradual taper of 1.5 to 3 cm. The end of the tip shall be
E 921 Specification for Export Packaged Laboratory Appa-
perpendicular to the longitudinal axis of the tip. The outside
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ratus
edge of the tip may be bevelled slightly and the end and the
E 1133 Practice for PerformanceTesting of Packaged Labo-
bevel shall be ground or fire-polished. Sudden constriction at
ratory Apparatus for United States Government Procure-
the orifice would impair smooth flow characteristics of the
2
ments
delivery stream and is not acceptable.
E 1157 Specification for the Sampling and Testing of Reus-
4.3.1 Tempered Tips—May be supplied at option of manu-
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able Laboratory Glassware
facturer. The tempered tip, when tested in index oil which
matches the refractive index of the glass being used, shall have
3. General Requirements
a temper between 75 and 220 nm (millimicrons).
3.1 Borosilicate Glass—Borosilicate glass for pipets shall
4.4 Markings—All markings shall be permanent and leg-
conform to the glass requirements of Type 1, Class A or B of
ible.
Specification E 438.
4.4.1 Capacity Line—The capacity line shall be a sharply
3.2 Calibration—Pipets shall be calibrated to deliver (sym-
defined line of uniform width (maximum 0.6 mm) in a plane
bol TD) the intended capacity at 20°C. The pipet shall be filled
perpendicular to the vertical axis of the pipet. The line shall be
about 20 mm above the capacity line. The water is lowered
appliedbyoneofthefollowingmethods:etchedand filled with
slowly to the capacity line. Delivery of the contents into a
a permanent pigment; etched through a vertical colored stripe
fusedintotheglass;byapplicationofastainfiredintotheglass
without etching; or by application of an enamel fired onto the
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This specification is under the jurisdiction of ASTM Committee E41 on
glass without etching. The line shall completely encircle the
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
tube except when the line is a stain fired into the glass without
Apparatus.
Current edition approved Oct. 10, 2002. Published November 2002. Originally
etching. If so stained, the line shall extend a minimum of 90 %
published as E 969 – 83. Last previous edition E 969 – 95(1999).
of the way around the tube.
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Annual Book of ASTM Standards, Vol 14.04.
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E969–02
TABLE 1 Requirements for Volumetric (Transfer) Pipet
Nominal Capacity Tolerance, Length of Delivery Tube, Inside Diameter at Minimum Outflow
Maximum Distance
A Color-Coding
Capacity, mL mm Capacity Mark, mm Time, s
Between Bulb and
...