ASTM E676-02(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E676 −02 (Reapproved 2019)
Standard Specification for
Interchangeable Taper-Ground Joints
This standard is issued under the fixed designation E676; 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 E671 Specification for Maximum Permissible Thermal Re-
sidual Stress in Annealed Glass Laboratory Apparatus
1.1 This specification covers designations, dimensions, and
E920 Specification for Commercially Packaged Laboratory
tolerances for only the ground surfaces of interchangeable
Apparatus
taper-ground joints for laboratory and industrial equipment in
E921 Specification for Export Packaged Laboratory Appa-
full-length, medium-length, short-length, and international-
ratus
length (ISO K-6 series) grindings.
E1133 Practice for Performance Testing of Packaged Labo-
NOTE 1—The dimensions pertaining to full-length, medium-length, and
ratory Apparatus for United States Government Procure-
short-length joints, other than for the tolerance on length of grind, were
ments
taken directly from the now obsolete Commercial Standard CS 21.
E1157 Specification for Sampling and Testing of Reusable
NOTE 2—Tolerances on the diameters of the international-length joints
Laboratory Glassware
do not agree with those given in ISO Recommendation R 383. These
tolerances have been established to agree with those of CS 21 in order to
2.2 U.S. Department of Commerce Standard:
prevent the negative projection (large end of inner joint being smaller than
CS 21 Interchangeable Taper-Ground Joints, Stopcocks,
large end of outer joint) permitted by ISO.
Stoppers, and Spherical-Ground Joints
NOTE 3—Although glass is the most commonly used material for
ground joints, other materials may be used as specified. Taper-ground
2.3 ISO Standard:
joints constructed from glass should be of suitable chemical and thermal
R 383 Interchangeable Conical Ground Glass Joints
properties in accordance with Specification E438. Joints should be as free
as possible of visible defects and conform to Specification E671.
3. Requirements
1.2 The following precautionary caveat pertains only to the
3.1 Designations, dimensions, and tolerances shall be as
Test Method portion, Section 4, of this specification. This
shown in Fig. 1 and in Table 1, Table 2, Table 3, and Table 4.
standarddoesnotpurporttoaddressallofthesafetyconcerns,
3.2 Surface Finish—The roughness average (R)ofthe
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
a
ground surface shall not exceed 1 µm (40 uim).
of this standard to establish appropriate safety, health, and
environmental practices and determine the applicability of
3.3 Taper—All taper-ground joints shall have a taper of 1 6
regulatory limitations prior to use.
0.006 mm of diameter per 10 mm of length (1 to 10).
1.3 This international standard was developed in accor-
3.4 Leakage—Using the leak test apparatus illustrated in
dance with internationally recognized principles on standard-
Fig. 2, or one functionally similar to it, with the average
ization established in the Decision on Principles for the
differential pressure during the test kept above 600 mm Hg, the
Development of International Standards, Guides and Recom-
leak rate calculated from the test data (see 4.9) shall not exceed
mendations issued by the World Trade Organization Technical
0.05 torr·litres/s (or Pa·litres/s) when the inner and outer joints
Barriers to Trade (TBT) Committee.
are assembled dry.
2. Referenced Documents
4. Test Method
2.1 ASTM Standards:
4.1 Clean both joints to be tested with distilled water, and
E438 Specification for Glasses in Laboratory Apparatus
then dry them with a clean paper towel. Next, wipe the ground
zones with a clean chamois to remove any remaining particles.
This specification is under the jurisdiction of ASTM Committee E41 on
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on 4.2 Tightly close the unground end of the joint to be
Laboratory Ware and Supplies.
connected to the manometer system, using a rubber stopper
Current edition approved Jan. 1, 2019. Published January 2019. Originally
containing a concentric hole (or rubber tubing, depending upon
approvedin1979.Lastpreviouseditionapprovedin2012asE676 – 02(2012).DOI:
10.1520/E0676-02R19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Discontinued 1979—U.S. Department of Commerce, Washington, DC 20234.
Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E676 − 02 (2019)
FIG. 1 Taper-Ground Joint
TABLE 1 Full-Length Taper-Ground Joints TABLE 2 Medium-Length Taper-Ground Joints
Joint Size A B C Joint Size A B C
Designation Approximate Approxi- Diameter at Designation Approximate Approxi- Diameter at
Diameter at mate Length Large End Diameter at mate Length Large End
Small End, of Ground of Ground Small End, of Ground of Ground
A B A B
mm Zone, mm Zone, mm mm Zone, mm Zone
7/25 5.0 25 7.5 5/12 3.8 12 5.0
10/30 7.0 30 10.0 7/15 6.0 15 7.5
12/30 9.5 30 12.5 10/18 8.2 18 10.0
14/35 11.0 35 14.5 12/18 10.7 18 12.5
19/38 15.0 38 18.8 14/20 12.5 20 14.5
24/40 20.0 40 24.0 19/22 16.6 22 18.8
29/42 25.
...