ASTM E732-80(2011)
(Specification)Standard Specification for Disposable Pasteur-Type Pipet
Standard Specification for Disposable Pasteur-Type Pipet
ABSTRACT
This specification covers the design and dimensional requirements for four types (Types I, II, III, and IV) of disposable bacteriological (Pasteur-type) nonvolumetric glass pipets suitable for replicate dispensing of drops of solutions and suspensions for laboratory purposes. The pipets shall be made of good quality, clear glass of either Type I, Class A or B (borosilicate), or Type II (soda lime). They shall be of a one-piece glass construction and each type shall correspondingly meet the requirements for overall length, body length, body outside diameter, body wall thickness, top-to-constriction distance, and tip inside diameter.
SCOPE
1.1 This specification covers requirements for four types of glass disposable bacteriological (Pasteur type) nonvolumetric pipets suitable for replicate dispensing of drops of solutions and suspensions for laboratory purposes.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:E732 −80 (Reapproved 2011)
Standard Specification for
Disposable Pasteur-Type Pipet
This standard is issued under the fixed designation E732; 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 5. Workmanship, Finish, and Appearance
1.1 This specification covers requirements for four types of
5.1 The pipets shall be free of obstructions, visible defects,
glass disposable bacteriological (Pasteur type) nonvolumetric irregularities, striae, bubbles, and other defects that detract
pipets suitable for replicate dispensing of drops of solutions
from appearance and impair their serviceability.
and suspensions for laboratory purposes.
5.2 The pipets shall be visibly clean and ready for use; free
of grease, dirt, grit, oil, or oily type substances readibly
2. Referenced Documents
detectable to the naked eye under normal room lighting.
2.1 ASTM Standards:
5.3 Pipets shall be straight and concentric to the extent that
E438 Specification for Glasses in Laboratory Apparatus
when rolled on a plane surface the tip of the pipet shall not
3. Terminology touch the surface.
3.1 Definitions of Terms Specific to This Standard:
5.4 Pipets shall be of sufficient strength and uniformity of
3.1.1 disposable pipets—in accordance with this specifica- wall thickness to withstand normal usage and transporation.
tion and the expected product performance expressed in this
standard, those pipets which are to be used one time only. Any
6. Requirements
institution or individual who reuses a disposable pipet must
6.1 Material—The pipets shall be made of good quality,
bear full responsibility for its safety and effectiveness.
clear glass conforming to the requirements of Type I, Class A
or B (borosilicate), or Type II (soda lime), of Specification
4. Classification
E438.
4.1 Pipets covered by this specification shall be of the
6.2 Design and Dimensions—The pipets shall be of a
following types according to size:
3 one-piece glass construction and meet the dimensions and
Type I—5 ⁄4 in. (approximately 150 mm) long
tolerance outlined in Table 1. The pipets may be fabricated
Type II—9 in. (approximately 230 mm) long
3 with a constriction to allow for cotton-plugging, which shall be
Type III—Large-tip pipet 5 ⁄4 in. (approximately 150 mm)
considered an optional feature at the discretion of the manu-
long
3 facturer. The top of the pipet shall be fire-polished, free of
Type IV—Jumbo pipet 5 ⁄4 in. (approximately 150 mm) long
sharp edges, and be finished approximately 90 deg to the axis
of the pipet. The tip of the pipet shall be cut approximately 90°
This spec
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