ASTM E287-94(1998)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: E 287 – 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
Laboratory Glass Graduated Burets
This standard is issued under the fixed designation E 287; 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 E 1133 Practice for Performance Testing of Packaged Labo-
ratory Apparatus United States Government Procurement
1.1 This specification covers requirements for glass burets
E 1157 Specification for Sampling and Testing Reusable
of precision and general-purpose grades suitable for laboratory
Laboratory Glassware
use.
1.1.1 Class A—Each buret of precision grade may be
3. General Requirements
marked with the letter “A” to signify compliance with appli-
3.1 Calibration—Burets shall be calibrated to deliver the
cable construction and accuracy requirements in Table 1 and
intended volume at 20°C. No after-drainage period is allowed.
Table 2. Each buret may be marked with a permanent serial
Volumetric tolerances shall be within the limits specified in
number at the option of the manufacturer.
Table 1.
1.1.2 Class B—General purpose burets are of the same basic
design as Class A burets. However, volumetric tolerances for
4. Design
Class B burets shall be within twice the specified range allowed
4.1 Shape—This specification covers 10, 25, 50 and
for Class A burets. These burets need not be marked with their
100-mL straight burets with single-bore stopcock; 10, 25, 50
class designation or serial number. See Table 1 and Table 3 for
and 100-mL straight burets with 3-way stopcock; 100-mL
tolerances and dimensional requirements.
burets with 50-mL bulb (intermediate bulb style); and 10, 25,
NOTE 1—The Twelfth General (International) Conference on Weights
50 and 100-mL self-zeroing burets.
and Measures redefined the litre as a “special name for the cubic
4.1.1 Self-zeroing burets shall have an ungraduated, ta-
decimetre,” but agreed to permit continuance of the terms litre, millilitre,
pered, interior extension that terminates with an overflow
and mL, except in association with measurements of the highest precision.
orifice. The exterior of the buret shall extend reasonably
For volumetric glassware the difference between the old and new
beyond the terminal point of the interior overflow orifice. An
meanings of litre is negligible. Therefore, either mL or cm may be
marked on ware covered by this standard. exterior outlet tube positioned below the overflow orifice shall
also be provided for drainage of overflow. End of outlet tube
2. Referenced Documents
shall be slightly enlarged and bulbous for attachment to flexible
2.1 ASTM Standards:
tubing.
D 664 Test Method for Neutralization Number by Potentio-
4.1.2 A cross section of the graduated portion of all buret
metric Titration
styles taken in a plane perpendicular to their longitudinal axis
E 438 Specification for Glasses in Laboratory Apparatus
shall be circular.
E 542 Practice for Calibration of Volumetric Ware
4.2 Filling Tube—Burets may be equipped with a filling
E 675 Specification for Interchangeable Taper-Ground
tube as described below.
Stopcocks and Stoppers
4.2.1 For Class A burets, filling tubes may either be attached
E 694 Specification for Volumetric Ware
to the underside of a 3-way stopcock or mounted onto the
E 911 Specification for Glass Stopcocks with Polytetrafluo-
lower ungraduated body of those burets having straight bore
roethylene (PTFE) Plugs
stopcocks. Filling tubes which are mounted onto the body of
E 920 Specification for Commercially Packaged Laboratory
Class A burets must utilize a separate stopcock integral with the
Apparatus
filling tube. When a separate stopcock is used, positioning of
E 921 Specification for Export Packaged Laboratory Appa-
the stopcock must be oriented so that the handle of the
ratus
stopcock plug is readily accessible when buret is in normal
viewing position.
4.2.2 Filling tubes attached to 3-way stopcocks shall be in
the form of an elbow, extending downward from the stopcock.
This specification is under the jurisdiction of ASTM Committee E-41 on
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
The open end of the filling tube shall extend toward the rear
Glass Apparatus.
from the buret and be slightly enlarged or bulbous for firmly
Current edition approved Feb. 15, 1994. Published March 1994. Originally
securing flexible tubing.
published as E 287 – 65T. Last previous edition E 287 – 83 (1988).
Annual Book of ASTM Standards, Vol 05.01. 4.2.3 Class B burets may have filling tubes affixed in any of
Annual Book of ASTM Standards, Vol 14.04.
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
E 287
TABLE 1 Requirements for Burets
Graduated Scale
Subdivision, Class A Class B Distance, Top Class A Class A Class B
Capacity, mL Scale Length, Scale Length, of Buret to “0” and B Volumetric Volumetric
mL Class A mm mm Graduation, Number Tolerance, Tolerance,
A
and B 0 to Capacity 0 to Capacity mm Each, mL 6mL 6mL
10 0.05 350 to 450 250 to 450 30 to 75 0.5 0.02 0.04
25 0.1 350
...