ASTM E676-02

Standard Specification for Interchangeable Taper-Ground Joints

SCOPE
1.1 This specification covers designations, dimensions, and tolerances for only the ground surfaces of interchangeable taper-ground joints for laboratory and industrial equipment in full-length, medium-length, short-length, and international-length (ISO K-6 series) grindings.
Note 1—The dimensions pertaining to full-length, medium-length, and short-length joints, other than for the tolerance on length of grind, were taken directly from the now obsolete Commercial Standard CS 21.
Note 2—Tolerances on the diameters of the international-length joints do not agree with those given in ISO Recommendation R383. These tolerances have been established to agree with those of CS 21 in order to prevent the negative projection (large end of inner joint being smaller than large end of outer joint) permitted by ISO.
Note 3—Although glass is the most commonly used material for ground joints, other materials may be used as specified. Taper-ground joints constructed from glass should be of suitable chemical and thermal properties in accordance with Specification E 438. Joints should be as free as possible of visible defects and conform to Specification E 671.
1.2 The following precautionary caveat pertains only to the Test Method portion, Section 4, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Oct-2002
• ICS: 71.040.20 - Laboratory ware and related apparatus
• Technical Committee: E41 - Laboratory Apparatus
• Drafting Committee: E41.01 - Laboratory Ware and Supplies

Relations

• Replaces: ASTM E676-94(1998) - Standard Specification for Interchangeable Taper-Ground Joints
• Effective Date: 10-Oct-2002
• Replaced By: ASTM E676-02(2007) - Standard Specification for Interchangeable Taper-Ground Joints
• Effective Date: 01-Nov-2007
• Referred By: ASTM E1189-00(2022) - Standard Specification for Micro-Burets (Koch Style)
• Effective Date: 10-Oct-2002
• Referred By: ASTM E1404-94(2019) - Standard Specification for Laboratory Glass Conical Flasks
• Effective Date: 10-Oct-2002
• Referred By: ASTM E1406-95(2022) - Standard Specification for Laboratory Glass Filter Flasks
• Effective Date: 10-Oct-2002
• Referred By: ASTM E1378-99(2022) - Standard Specification for Laboratory Glass Multiple Neck Distilling/Boiling Flasks
• Effective Date: 10-Oct-2002
• Referred By: ASTM E1403-97(2019) - Standard Specification for Laboratory Glass Boiling Flasks
• Effective Date: 10-Oct-2002
• Referred By: ASTM E1096-86(2018) - Standard Specification for Laboratory Glass Separatory Funnels
• Effective Date: 10-Oct-2002
• Referred By: ASTM E694-18 - Standard Specification for Laboratory Glass Volumetric Apparatus
• 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 676 – 02
Standard Specification for
1
Interchangeable Taper-Ground Joints
This standard is issued under the fixed designation E 676; 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 1157 Specification for Sampling and Testing Reusable
2
Laboratory Glassware
1.1 This specification covers designations, dimensions, and
2.2 U.S. Department of Commerce Standard:
tolerances for only the ground surfaces of interchangeable
CS 21 Interchangeable Taper-Ground Joints, Stopcocks,
taper-ground joints for laboratory and industrial equipment in
3
Stoppers, and Spherical-Ground Joints
full-length, medium-length, short-length, and international-
2.3 ISO Standard:
length (ISO K-6 series) grindings.
4
R 383 Interchangeable Conical Ground Glass Joints
NOTE 1—The dimensions pertaining to full-length, medium-length, and
short-length joints, other than for the tolerance on length of grind, were
3. Requirements
taken directly from the now obsolete Commercial Standard CS 21.
3.1 Designations, dimensions, and tolerances shall be as
NOTE 2—Tolerances on the diameters of the international-length joints
shown in Fig. 1 and in Table 1, Table 2, Table 3, and Table 4.
do not agree with those given in ISO Recommendation R383. These
3.2 Surface Finish—The roughness average (R)ofthe
tolerances have been established to agree with those of CS 21 in order to
a
prevent the negative projection (large end of inner joint being smaller than ground surface shall not exceed 1 µm (40uim).
large end of outer joint) permitted by ISO.
3.3 Taper—All taper-ground joints shall have a taper of 16
NOTE 3—Although glass is the most commonly used material for
0.006 mm of diameter per 10 mm of length (1 to 10).
ground joints, other materials may be used as specified. Taper-ground
3.4 Leakage—Using the leak test apparatus illustrated in
joints constructed from glass should be of suitable chemical and thermal
Fig. 2, or one functionally similar to it, with the average
properties in accordance with Specification E 438. Joints should be as free
differential pressure during the test kept above 600 mm Hg, the
as possible of visible defects and conform to Specification E 671.
leak rate calculated from the test data (see 4.9) shall not exceed
1.2 The following precautionary caveat pertains only to the
0.05 torr·litres/s (or Pa·litres/s) when the inner and outer joints
Test Method portion, Section 4, of this specification. This
are assembled dry.
standarddoesnotpurporttoaddressallofthesafetyconcerns,
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
4. Test Method
of this standard to establish appropriate safety and health
4.1 Clean both joints to be tested with distilled water, and
practices and determine the applicability of regulatory limita-
then dry them with a clean paper towel. Next, wipe the ground
tions prior to use.
zones with a clean chamois to remove any remaining particles.
4.2 Tightly close the unground end of the joint to be
2. Referenced Documents
connected to the manometer system, using a rubber stopper
2.1 ASTM Standards:
containing a concentric hole (or rubber tubing, depending upon
2
E 438 Specification for Glasses in Laboratory Apparatus
the joint size under test) sized to fit snugly on the manometer
E 671 Specification for Maximum Permissible Thermal Re-
connection,andmountthejointontheconnectioninanupright
2
sidual Stress in Annealed Glass Laboratory Apparatus
position.
E 920 Specification for Commercially Packaged Laboratory
4.3 Firmly plug the unground end of the other type of joint
2
Apparatus
with a solid rubber stopper.
E 921 Specification for Export Packaged Laboratory Appa-
4.4 Carefully mate the ground surfaces of the joints without
2
ratus
exerting any pressure on them.
E 1133 PracticeforPerformanceTestingofPackagedLabo-
4.5 Gently apply a 225-g weight on the upper joint for
2
ratory Apparatus United States Government Procurement
seating pressure, then rotate the upper joint 90° and remove the
weight.
4.6 After ensuring that the stopcock to the vacuum pump is
1
intheclosedposition,turnonthepumpandadjustthestopcock
This specification is under the jurisdiction of ASTM Committee E41 on
Laboratory Apparatus and is the direct responsibility of Subcommittee E 41.01 on
Apparatus.
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Current edition approved Oct. 10, 2002. Published November 2002. Originally Discontinued 1979—U.S. Department of Commerce, Washington, DC 20234.
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published as E 676 – 79. Last previous edition E 676 – 84 (1998). Available from American National Standards Institute, 1430 Broadway, New
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Annual Book of ASTM Standards, Vol 14.04. York, NY 1001
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