ASTM E934-94(2004)
(Specification)Standard Specification for Serological Pipet, Disposable Plastic
Standard Specification for Serological Pipet, Disposable Plastic
ABSTRACT
This specification covers disposable plastic serological pipets, calibrated to deliver when measuring volumes of liquids. The pipets shall be fabricated from crystal-grade, uncolored polystyrene, or its regrind. They shall adhere to the property requirements discussed herein for design (shape, delivery tips, top end, dimensions, and outflow times), graduation and identification markings, capacity, and accuracy and coefficient of variation.
SCOPE
1.1 This specification covers disposable plastic serological pipets, calibrated "to deliver" when measuring volumes of liquids.
1.1.1 Any institution or individual who reuses a disposable pipet must bear full responsibility for its safety and effectiveness.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation: E934 – 94 (Reapproved 2004)
Standard Specification for
Serological Pipet, Disposable Plastic
This standard is issued under the fixed designation E934; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4. Material and Manufacturer
1.1 This specification covers disposable plastic serological 4.1 The pipets made to this specification shall be fabricated
pipets, calibrated “to deliver” when measuring volumes of from crystal grade, uncolored polystyrene, or regrind of same,
liquids. in accordance with Specification D703.
1.1.1 Any institution or individual who reuses a disposable
5. Design
pipet must bear full responsibility for its safety and effective-
5.1 Shape—0.5,1.0,and2.0-cm pipetsshallbestraightand
ness.
of one-piece construction.Any cross section of a pipet taken in
2. Referenced Documents
a plane perpendicular to the longitudinal axis shall be circular.
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2.1 ASTM Standards: 5.1.1 Pipets of 5.0, 10.0, 25.0, and 50.0 cm shall be straight
D703 Specification for Polystyrene Molding and Extrusion and may consist of one, two, or three components, the extruded
Materials pipet barrel, the pulled or injection molded tip, and the plain,
E542 Practice for Calibration of Laboratory Volumetric pulled, or injection molded top end. Any cross section of a
Apparatus pipet taken in a plane perpendicular to the longitudinal axis
E920 Specification for Commercially Packaged Laboratory shall be circular.
Apparatus 5.2 Delivery Tips—Delivery tips shall be made with a
E921 Specification for Export Packaged Laboratory Appa- gradual taper of 10 to 40 mm. The tip end shall be reasonably
ratus perpendicular to the longitudinal axis of the pipet, and shall be
E1133 Practice for Performance Testing of Packaged Labo- free of internal flash.
ratory Apparatus for United States Government Procure- 5.3 TopEnd—The5,10,25.0,and50.0-cm sizesshallhave
ments a top end with an inside diameter of 2 to 6.5 mm for a
minimum distance of 20 mm from the open end, and shall have
3. Terminology
an overall length of 24 to 28 mm. On all sizes, the top end shall
3.1 Definitions of Terms Specific to This Standard: be suitable for plugging with filtering material.The top may be
3.1.1 accuracy—the expected distribution of mean volumes
flat or chamfered and must be without sharp outer edges. All
around the stated volume. top ends shall be reasonably perpendicular to the longitudinal
3.1.2 coeffıcient of variation—the expected distribution of
axis of the pipet. The O.D. of top end should range from 7 to
individual volumes around the mean volume. 9 mm.
3.1.3 disposablepipet—such pipets will only be expected to
5.4 Dimensions and Outflow Times—The limiting dimen-
provide their specified performance during their original use or sions and outflow times shall be as shown in Table 1. Outflow
operation.
times shall be determined by means of a stopwatch on
unplugged pipets when using distilled water at 25 6 5°C.
This specification is under the jurisdiction of ASTM Committee E41 on
6. Markings
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
Apparatus.
6.1 Graduation Markings—Graduation lines shall be be-
Current edition approved May 1, 2004. Published May 2004. Originally
tween 0.2 mm and 0.5 mm in width, and in a plane perpen-
approved in 1983. Last previous edition approved in 1998 as E934 – 94 (1998).
dicular to the longitudinal axis of the pipet parallel to each
DOI: 10.1520/E0934-94R04.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or other.Amain graduation line shall extend at least ⁄5 of the way
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
around the pipet. The values of all main graduation lines shall
Standards volume information, refer to the standard’s Document Summary page on
be in Arabic numbers directly above the lines referenced.
the ASTM website.
Intermediategraduationlinesshallextendatleast ⁄5oftheway
Withdrawn.
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E934 – 94 (2004)
TABLE 1 Dimensions and Outflow Times
Least Value Graduation cm
...
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