1、Designation: E676 02 (Reapproved 2012)Standard Specification forInterchangeable Taper-Ground Joints1This standard is issued under the fixed designation E676; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers designations, dimensions, andtolerances for only the ground surfaces of interchangeabletaper-ground joint
3、s for laboratory and industrial equipment infull-length, medium-length, short-length, and international-length (ISO K-6 series) grindings.NOTE 1The dimensions pertaining to full-length, medium-length, andshort-length joints, other than for the tolerance on length of grind, weretaken directly from th
4、e now obsolete Commercial Standard CS 21.NOTE 2Tolerances on the diameters of the international-length jointsdo not agree with those given in ISO Recommendation R 383. Thesetolerances have been established to agree with those of CS 21 in order toprevent the negative projection (large end of inner jo
5、int being smaller thanlarge end of outer joint) permitted by ISO.NOTE 3Although glass is the most commonly used material forground joints, other materials may be used as specified. Taper-groundjoints constructed from glass should be of suitable chemical and thermalproperties in accordance with Speci
6、fication E438. Joints should be as freeas possible of visible defects and conform to Specification E671.1.2 The following precautionary caveat pertains only to theTest Method portion, Section 4, of this specification. Thisstandard does not purport to address all of the safety concerns,if any, associ
7、ated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2E438 Specification for Glasses in Laboratory ApparatusE671 Sp
8、ecification for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory ApparatusE920 Specification for Commercially Packaged LaboratoryApparatusE921 Specification for Export Packaged Laboratory Appa-ratusE1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus for
9、United States Government Procure-mentsE1157 Specification for Sampling and Testing of ReusableLaboratory Glassware2.2 U.S. Department of Commerce Standard:CS 21 Interchangeable Taper-Ground Joints, Stopcocks,Stoppers, and Spherical-Ground Joints32.3 ISO Standard:R 383 Interchangeable Conical Ground
10、Glass Joints43. Requirements3.1 Designations, dimensions, and tolerances shall be asshown in Fig. 1 and in Table 1, Table 2, Table 3, and Table 4.3.2 Surface FinishThe roughness average (Ra)oftheground surface shall not exceed 1 m (40uim).3.3 TaperAll taper-ground joints shall have a taper of 1 60.0
11、06 mm of diameter per 10 mm of length (1 to 10).3.4 LeakageUsing the leak test apparatus illustrated inFig. 2, or one functionally similar to it, with the averagedifferential pressure during the test kept above 600 mm Hg, theleak rate calculated from the test data (see 4.9) shall not exceed0.05 torr
12、litres/s (or Palitres/s) when the inner and outer jointsare assembled dry.4. Test Method4.1 Clean both joints to be tested with distilled water, andthen dry them with a clean paper towel. Next, wipe the groundzones with a clean chamois to remove any remaining particles.4.2 Tightly close the unground
13、 end of the joint to beconnected to the manometer system, using a rubber stoppercontaining a concentric hole (or rubber tubing, depending uponthe joint size under test) sized to fit snugly on the manometerconnection, and mount the joint on the connection in an uprightposition.4.3 Firmly plug the ung
14、round end of the other type of jointwith a solid rubber stopper.1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onApparatus.Current edition approved Nov. 1, 2012. Published November 2012. Originallyapp
15、roved in 1979. Last previous edition approved in 2007 as E676 02(2007). DOI:10.1520/E0676-02R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Docume
16、nt Summary page onthe ASTM website.3Discontinued 1979U.S. Department of Commerce, Washington, DC 20234.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West
17、 Conshohocken, PA 19428-2959. United States14.4 Carefully mate the ground surfaces of the joints withoutexerting any pressure on them.4.5 Gently apply a 225-g weight on the upper joint forseating pressure, then rotate the upper joint 90 and remove theweight.4.6 After ensuring that the stopcock to th
18、e vacuum pump isin the closed position, turn on the pump and adjust the stopcockto the pump so that the mercury in the manometer rises to alevel such that the average differential pressure will remainabove 600 mm at the conclusion of the test.4.7 Air leakage is now allowed to occur through the mated
19、joints for a timed interval, and the change in differentialpressure is noted.4.8 Repeat 4.1 through 4.7 once, ensuring in 4.5 that theupper joint is rotated 90 deg from its position in the first test.4.9 Compute the leak rate in torr litres per second or pascallitres per second as follows:Leak rate
20、5 3VT(1)FIG. 1 Taper-Ground JointTABLE 1 Full-Length Taper-Ground JointsJoint Size A B CDesignation Approximate Approxi- Diameter atDiameter at mate Length Large EndSmall End, of Ground of Groundmm Zone, mmAZone, mmB7/25 5.0 25 7.510/30 7.0 30 10.012/30 9.5 30 12.514/35 11.0 35 14.519/38 15.0 38 18.
21、824/40 20.0 40 24.029/42 25.0 42 29.234/45 30.0 45 34.540/50 35.0 50 40.045/50 40.0 50 45.050/50 45.0 50 50.055/50 50.0 50 55.060/50 55.0 50 60.071/60 65.0 60 71.0103/60 97.0 60 103.0AA tolerance of 1.5 mm is allowed on both inner and outer members.BA tolerance of + 0.15 mm is allowed on inner membe
22、rs, and a tolerance of 0.15mm on outer members.TABLE 2 Medium-Length Taper-Ground JointsJoint Size A B CDesignation Approximate Approxi- Diameter atDiameter at mate Length Large EndSmall End, of Ground of Groundmm Zone, mmAZoneB5/12 3.8 12 5.07/15 6.0 15 7.510/18 8.2 18 10.012/18 10.7 18 12.514/20 1
23、2.5 20 14.519/22 16.6 22 18.824/25 21.5 25 24.029/26 26.6 26 29.234/28 31.7 28 34.540/35 36.5 35 40.0AA tolerance of 1.5 mm is allowed on both inner and outer members.BA tolerance of + 0.15 mm is allowed on inner members, and a tolerance of 0.15mm on outer members.E676 02 (Reapproved 2012)2where:P =
24、 maximum change in differential pressure noted in test,mmHg or Pa,V = total evacuated volume, including manometer tubing,connections, flask, and joints, litres, andT = time of test, s.5. Sampling and Testing5.1 For sampling and testing refer to Specification E1157.6. Product Marking6.1 Interchangeab
25、le taper-ground joints conforming to thisspecification may be marked on both members with$!,indicating standard taper, the size designation, and the trade-mark of the manufacturer or distributor. This symbol is themanufacturers assurance to purchasers that the item identi-fied by the symbol is a sta
26、ndard interchangeable size andtype, and is manufactured within the tolerances permitted bythis specification. It shall not be used on joints, nor in adver-tising descriptions of joints, of any size or type other thanthose described in this specification.7. Packaging7.1 For packaging select from Spec
27、ification E920, E921,orPractice E1133.8. Keywords8.1 ground; jointsTABLE 3 Short-Length Taper-Ground JointsJoint Size A B CDesignation Approximate Approxi- Diameter atDiameter at mate Length Large EndSmall End, of Ground of Groundmm Zone, mmAZone, mmB5/8 4.2 8 5.07/10 6.5 10 7.510/7 9.3 7 10.010/10
28、9.0 10 10.012/10 11.5 10 12.514/10 13.5 10 14.519/10 17.8 10 18.824/12 22.8 12 24.029/12 28.0 12 29.234/12 33.3 12 34.540/12 38.8 12 40.045/12 43.8 12 45.050/12 48.8 12 50.055/12 53.8 12 55.060/12 58.8 12 60.071/15 69.5 15 71.0AA tolerance of 1.5 mm is allowed on both inner and outer members.BA tole
29、rance of + 0.15 mm is allowed on inner members, and a tolerance of 0.15mm on outer members.TABLE 4 International-Length Taper-Ground JointsJoint Size A B CDesignation Approximate Approxi- Diameter atDiameter at mate Length Large EndSmall End, of Ground of Groundmm Zone, mmAZone, mmB5/13 3.7 13 5.07/
30、16 5.9 16 7.510/19 8.1 19 10.012/21 10.4 21 12.514/23 12.2 23 14.519/26 16.2 26 18.821/28 18.7 28 21.524/29 21.1 29 24.029/32 26.0 32 29.234/35 31.0 35 34.540/38 36.2 38 40.045/40 41.0 40 45.050/42 45.8 42 50.060/46 55.4 46 60.071/51 65.9 51 71.085/55 79.5 55 85.0100/60 94.0 60 100.0AA tolerance of
31、1.5 mm is allowed on both inner and outer members.BA tolerance of + 0.15 mm is allowed on inner members, and a tolerance of 0.15mm on outer members.E676 02 (Reapproved 2012)3ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mention
32、edin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and
33、 must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of
34、 theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box
35、C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permis
36、sion rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).NOTE 1Evacuated volume of manometer tubing, connections, and flask shall be 100 to 150 cm3. Joint volume shall be added for leak rate calculation.NOTE 2Leak rate of apparatus shall not exceed 5 % of that of joint being tested.NOTE 3Dimensions are in millimetres approximate, except for minimum diameters.FIG. 2 Apparatus for Leak TestE676 02 (Reapproved 2012)4
