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    ASTM E287 - 02(2012)

    Standard Specification for Laboratory Glass Graduated Burets

    Active Standard ASTM E287 | Developed by Subcommittee: E41.01

    Book of Standards Volume: 14.04

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    Abstract

    This specification covers requirements for glass burets of precision and general-purpose grades suitable for laboratory use. Burets are classified as: class A - precision grade buret, and class B - general purpose burets. Burets shall be calibrated to deliver the intended volume at 20�C. No after-drainage period is allowed. Self-zeroing burets shall have an ungraduated, tapered, interior extension that terminates with an overflow orifice. Burets may be equipped with a filling tube. All burets shall have permanently attached stopcocks. The stopcock's handle shall be located to the right. Stopcock plugs shall be provided with a retaining device.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This specification covers requirements for glass burets of precision and general-purpose grades suitable for laboratory use.

    1.1.1 Class A—Each buret of precision grade may be marked with the letter “A” to signify compliance with applicable construction and accuracy requirements in Table 1 and Table 2. Each buret may be marked with a permanent serial number at the option of the manufacturer.

    TABLE 1 Requirements for Burets

     

     

    Graduated Scale

     

     

    Capacity,
    mL

    Subdivision,
    mL
    Class A
    and B

    Class A
    Scale Length,
    mm
    0 to Capacity

    Class B
    Scale Length,
    mm
    0 to Capacity

    Distance, Top
    of Buret to “0”
    Graduation,
    mmA

    Class A
    and B
    Number
    Each, mL

    Class A
    Volumetric
    Tolerance,
    ±mL

    Class B
    Volumetric
    Tolerance,
    ±mL

     10

     0.05

    350 to 450

    250 to 450

    30 to 75

    0.5

    0.02

    0.04

     25

    0.1

    350 to 450

    250 to 450

    30 to 75

    1

    0.03

    0.06

     50

    0.1

    500 to 600

    500 to 600

    40 to 100

    1

    0.05

    0.10

    100

    0.2

    550 to 650

    550 to 650

    40 to 100

    2

    0.10

    0.20

    A Straight burets only, not applicable to self-zeroing burets.
    TABLE 2 Minimum Delivery Time for Class A Burets Using Water

    Length
    Graduated,
    cm

    Time of Out-
    flow Not
    Less Than, s

    Length
    Graduated,
    cm

    Time of Out-
    flow Not Less
    Than, s

    15

    30

    45

     80

    20

    35

    50

     90

    25

    40

    55

    105

    30

    50

    60

    120

    35

    60

    65

    140

    40

    70

    70

    160


    1.1.2 Class B—General purpose burets are of the same basic design as Class A burets. However, volumetric tolerances for Class B burets shall be within twice the specified range allowed for Class A burets. These burets need not be marked with their class designation or serial number. See Table 1 and Table 3 for tolerances and dimensional requirements.

    Note 1—The Twelfth General (International) Conference on Weights and Measures redefined the litre as a “special name for the cubic decimetre,” but agreed to permit continuance of the terms litre, millilitre, and mL, except in association with measurements of the highest precision. For volumetric glassware the difference between the old and new meanings of litre is negligible. Therefore, either mL or cm3 may be marked on ware covered by this standard.
    TABLE 3 Minimum Delivery Time for Class B Buret Using Water

    Capacity, mL

    Time of Outflow Not Less
    Than, s

     10

    25

     25

    30

     50

    50

    100

    90


    1.1.3 Product with a stated capacity not listed in this standard may be specified Class A Tolerance when product conforms to the tolerance range of the next smaller volumetric standard product listed in Table 1.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    E675 Specification for Interchangeable Taper-Ground Stopcocks And Stoppers

    E911 Specification for Glass Stopcocks with Polytetrafluoroethylene (PTFE) Plugs

    E920 Specification for Commercially Packaged Laboratory Apparatus

    E921 Specification for Export Packaged Laboratory Apparatus

    E1133 Practice for Performance Testing of Packaged Laboratory Apparatus for United States Government Procurements

    E1157 Specification for Sampling and Testing of Reusable Laboratory Glassware

    ICS Code

    ICS Number Code 71.040.20 (Laboratory ware and related apparatus)

    UNSPSC Code

    UNSPSC Code 41121808(Laboratory burets)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/E0287-02R12

    Citation Format

    ASTM E287-02(2012), Standard Specification for Laboratory Glass Graduated Burets, ASTM International, West Conshohocken, PA, 2012, www.astm.org

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