ASTM E1293-94(1998)

Standard Specification for Glass Measuring Pipets

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

• Status: Historical
• Publication Date: 09-Oct-1998
• ICS: 71.040.20 - Laboratory ware and related apparatus
• Technical Committee: E41 - Laboratory Apparatus
• Drafting Committee: E41.01 - Laboratory Ware and Supplies

Relations

• Replaced By: ASTM E1293-02 - Standard Specification for Glass Measuring Pipets
• Effective Date: 10-Oct-2002

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: E 1293 – 94 (Reapproved 1998)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Glass Measuring Pipets
This standard is issued under the fixed designation E 1293; 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.
1. Scope 3.1.3 Capacities, (mL)—0.1, 0.2, 0.5, 1, 2, 5, 10, 25, and 50.
1.1 This specification covers requirements for glass measur-
4. Design
ing pipets of precision and general purpose grades, used in
4.1 Shape—The pipets shall be straight and of one-piece
measuring volumes of liquids.
construction. Any cross section of a pipet taken in a plane
2. Referenced Documents perpendicular to the longitudinal axis shall be circular.
4.2 Delivery Tips—Delivery tips of Style 1 pipets shall be
2.1 ASTM Standards:
made with a gradual taper of 15 to 30 mm for capacities up to
E 438 Specification for Glasses in Laboratory Apparatus
5 mL inclusive, and 20 to 40 mm for 10 to 50 mL capacity
E 671 Specification for Maximum Permissible Thermal Re-
pipets. Style 2 pipets shall have a taper at a distance of 50 to 65
sidual Stress in Annealed Glass Laboratory Apparatus
2 mm from the tip end. The end of the tip shall be perpendicular
E 694 Specification for Volumetric Ware
to the longitudinal axis of the pipet. A sudden constriction at
E 920 Specification for Commercially Packaged Laboratory
2 the orifice shall not be acceptable. The outside edge of the tip
Apparatus
shall be beveled slightly at the end, and the bevel shall be
E 921 Specification for Export Packaged Laboratory Appa-
2 ground or firepolished.
ratus
4.3 Zero Graduation Line Position—The distance from the
E 1133 Practice for Performance Testing of Packaged Labo-
2 top end to the top graduation of all pipets (except for 0.5 mL
ratory Apparatus United States Government Procurement
pipets) shall be not less than 90 mm; for 0.5 mL pipets this
E 1157 Specification for Sampling and Testing Reusable
2 distance shall be not less than 80 mm.
Laboratory Glassware
4.4 Dimensions and Outflow Times—The limiting dimen-
E 1273 Specification for Color Coding of Reusable Labo-
sions and outflow times are shown in Table 1. Outflow times
ratory Pipets
shall be determined on unplugged pipets using distilled water
3. Classification at 256 5°C and by means of a stopwatch. Outflow time shall
be determined by the unrestricted outflow of the water from the
3.1 Style, Class and Capacity—Pipets covered by this
zero mark to base mark and until the water has ceased to flow.
specification shall be of the following styles, classes, and
4.5 Markings—All markings shall be permanent and leg-
capacities:
ible.
3.1.1 Style 1—Standard taper tip.
4.5.1 Graduation Markings—Graduation lines shall not ex-
3.1.1.1 Class A—Each pipet of precision grade shall be
ceed 0.4 mm in thickness and shall be in a plane perpendicular
marked with the letter “A” to signify compliance with appli-
to the vertical axis of the pipet. The lines and other markings
cable construction and accuracy requirements in Table 1. Each
shall be applied by one of the following methods: etched and
pipet may be marked with a permanent serial number at the
filled with a permanent pigment; etched through a vertical
option of the manufacturer.
colored stripe fused into the glass; by application of a stain
3.1.1.2 Class B—General purpose pipets are of the same
fired into the glass without etching; or by application of an
basic design as Class A pipets. Volumetric tolerances for Class
enamel fired onto the glass without etching.
B pipets shall be within twice the specified range allowed for
4.5.1.1 Style 1, Class A pipets—Shall comply with the
Class A pipets. These pipets need not be marked with their
lengths of lines, numbering and Graduation Pattern 1 specified
class designation or serial number. See Table 1 for tolerances
in Specification E 694.
and dimensional requirements.
4.5.1.2 Style 1, Class B and Style 2 pipets—Main gradua-
3.1.2 Style 2—Long taper t
...