ASTM E969-95(1999)
(Specification)Standard Specification for Glass Volumetric (Transfer) Pipets
Standard Specification for Glass Volumetric (Transfer) Pipets
SCOPE
1.1 This specification covers volumetric pipets of two classes. Class A, Precision Pipet and Class B, General Purpose. Note 1-Specifications for micropipets are given in Specification E193.
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Designation: E 969 – 95 (Reapproved 1999)
Standard Specification for
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 the pipet taken in a plane perpendicular to the longitudinal axis
shall be circular. The shape shall permit complete emptying
1.1 This specification covers volumetric pipets of two
and thorough cleaning.
classes. Class A, Precision Pipet and Class B, General Purpose.
4.1.1 Bulb—The shape shall permit complete emptying
NOTE 1—Specifications for micropipets are given in Specification
without any hold up, and easy cleaning.
E 193.
4.2 Dimensions—The length of the suction tube shall be
150 to 190 mm and the minimum wall thickness of both
2. Referenced Documents
suction and delivery tubes shall be 0.90 mm. Pipets must
2.1 ASTM Standards:
comply with the essential dimensions given in Table 1.
E 193 Specification for Micropipets
4.3 Delivery Tips—Delivery tips shall be made with a
E 438 Specification for Glasses in Laboratory Apparatus
gradual taper of 1.5 to 3 cm. The end of the tip shall be
E 542 Practice for Calibration of Volumetric Apparatus
perpendicular to the longitudinal axis of the tip. The outside
E 694 Specification for Laboratory Volumetric Apparatus
edge of the tip may be bevelled slightly and the end and the
E 920 Specification for Commercially Packaged Laboratory
bevel shall be ground or fire-polished. Sudden constriction at
Apparatus
the orifice would impair smooth flow characteristics of the
E 921 Specification for Export Packaged Laboratory Appa-
delivery stream and is not acceptable.
ratus
4.3.1 Tempered Tips—May be supplied at option of manu-
E 1133 Practice for Performance Testing of Packaged Labo-
facturer. The tempered tip, when tested in index oil which
ratory Apparatus for United States Government Procure-
matches the refractive index of the glass being used, shall have
ments
a temper between 75 and 220 nm (millimicrons).
E 1157 Specification for the Sampling and Testing of Reus-
4.4 Markings—All markings shall be permanent and leg-
able Laboratory Glassware
ible.
4.4.1 Capacity Line—The capacity line shall be a sharply
3. General Requirements
defined line of uniform width (maximum 0.6 mm) in a plane
3.1 Borosilicate Glass—Borosilicate glass for pipets shall
perpendicular to the vertical axis of the pipet. The line shall be
conform to the glass requirements of Type 1, Class A or B of
applied by one of the following methods: etched and filled with
Specification E 438.
a permanent pigment; etched through a vertical colored stripe
3.2 Calibration—Pipets shall be calibrated to deliver (sym-
fused into the glass; by application of a stain fired into the glass
bol TD) the intended capacity at 20°C. The pipet shall be filled
without etching; or by application of an enamel fired onto the
about 20 mm above the capacity line. The water is lowered
glass without etching. The line shall completely encircle the
slowly to the capacity line. Delivery of the contents into a
tube except when the line is a stain fired into the glass without
receiving vessel is made with the tip in contact with the wall of
etching. If so stained, the line shall extend a minimum of 90 %
the vessel and no after-drainage period is allowed. Accuracy
of the way around the tube.
shall be within the limits specified in Table 1.
4.4.2 Color Coding—Each pipet shall be marked with one
or two color bands as specified in Table 1. The single band
4. Design
should be 6 to 10 mm wide, while the double color bands
4.1 Shape—The pipets shall consist in general of a suction
should each be 3 to 5 mm wide and separated by a clea
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