ASTM E676-02(2012)
(Specification)Standard Specification for Interchangeable Taper-Ground Joints
Standard Specification for Interchangeable Taper-Ground Joints
ABSTRACT
This specification covers the required properties of only the ground surfaces of interchangeable taper-ground joints used in laboratory and industrial equipment in full-length, medium length, short length, and international length grindings. It includes information on the testing method for the products. After testing, samples should conform to the required quality of surface finish, taper, and leakage for the specific joint size designation.
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 R 383. 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 E438. Joints should be as free as possible of visible defects and conform to Specification E671.
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.
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Designation:E676 −02 (Reapproved 2012)
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 E1133 Practice for Performance Testing of Packaged Labo-
ratory Apparatus for United States Government Procure-
1.1 This specification covers designations, dimensions, and
ments
tolerances for only the ground surfaces of interchangeable
E1157 Specification for Sampling and Testing of Reusable
taper-ground joints for laboratory and industrial equipment in
Laboratory Glassware
full-length, medium-length, short-length, and international-
2.2 U.S. Department of Commerce Standard:
length (ISO K-6 series) grindings.
CS 21 Interchangeable Taper-Ground Joints, Stopcocks,
NOTE 1—The dimensions pertaining to full-length, medium-length, and
Stoppers, and Spherical-Ground Joints
short-length joints, other than for the tolerance on length of grind, were
2.3 ISO Standard:
taken directly from the now obsolete Commercial Standard CS 21.
NOTE 2—Tolerances on the diameters of the international-length joints R 383 Interchangeable Conical Ground Glass Joints
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
3. Requirements
prevent the negative projection (large end of inner joint being smaller than
large end of outer joint) permitted by ISO. 3.1 Designations, dimensions, and tolerances shall be as
NOTE 3—Although glass is the most commonly used material for
shown in Fig. 1 and in Table 1, Table 2, Table 3, and Table 4.
ground joints, other materials may be used as specified. Taper-ground
3.2 Surface Finish—The roughness average (R)ofthe
joints constructed from glass should be of suitable chemical and thermal a
properties in accordance with Specification E438. Joints should be as free
ground surface shall not exceed 1 µm (40uim).
as possible of visible defects and conform to Specification E671.
3.3 Taper—All taper-ground joints shall have a taper of 1 6
1.2 The following precautionary caveat pertains only to the
0.006 mm of diameter per 10 mm of length (1 to 10).
Test Method portion, Section 4, of this specification.This
3.4 Leakage—Using the leak test apparatus illustrated in
standarddoesnotpurporttoaddressallofthesafetyconcerns,
Fig. 2, or one functionally similar to it, with the average
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
differential pressure during the test kept above 600 mm Hg, the
of this standard to establish appropriate safety and health
leak rate calculated from the test data (see 4.9) shall not exceed
practices and determine the applicability of regulatory limita-
0.05 torr·litres/s (or Pa·litres/s) when the inner and outer joints
tions prior to use.
are assembled dry.
2. Referenced Documents
2 4. Test Method
2.1 ASTM Standards:
E438 Specification for Glasses in Laboratory Apparatus 4.1 Clean both joints to be tested with distilled water, and
E671 Specification for Maximum Permissible Thermal Re- then dry them with a clean paper towel. Next, wipe the ground
sidual Stress in Annealed Glass Laboratory Apparatus zones with a clean chamois to remove any remaining particles.
E920 Specification for Commercially Packaged Laboratory
4.2 Tightly close the unground end of the joint to be
Apparatus
connected to the manometer system, using a rubber stopper
E921 Specification for Export Packaged Laboratory Appa-
containing a concentric hole (or rubber tubing, depending upon
ratus
the joint size under test) sized to fit snugly on the manometer
connection,andmountthejointontheconnectioninanupright
This specification is under the jurisdiction of ASTM Committee E41 on position.
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
4.3 Firmly plug the unground end of the other type of joint
Apparatus.
Current edition approved Nov. 1, 2012. Published November 2012. Originally with a solid rubber stopper.
approvedin1979.Lastpreviouseditionapprovedin2007asE676 – 02(2007).DOI:
10.1520/E0676-02R12.
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 (2012)
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 25.0 42 29.2 24/25 21.5 25 24.0
34/45 30.0
...
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