1、Designation: E 676 02Standard Specification forInterchangeable Taper-Ground Joints1This standard is issued under the fixed designation E 676; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in pa
2、rentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 joints for laborator
3、y 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 the now obsolete
4、Commercial Standard CS 21.NOTE 2Tolerances on the diameters of the international-length jointsdo not agree with those given in ISO Recommendation R383. Thesetolerances have been established to agree with those of CS 21 in order toprevent the negative projection (large end of inner joint being smalle
5、r 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 Specification E 438.
6、Joints should be as freeas possible of visible defects and conform to Specification E 671.1.2 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, associated with its
7、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:E 438 Specification for Glasses in Laboratory Apparatus2E 671 Specification
8、for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory Apparatus2E 920 Specification for Commercially Packaged LaboratoryApparatus2E 921 Specification for Export Packaged Laboratory Appa-ratus2E 1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus United Sta
9、tes Government Procurement2E 1157 Specification for Sampling and Testing ReusableLaboratory Glassware22.2 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 Glass Joints
10、43. 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 160.006 mm of diam
11、eter 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 torrlitres/s (or
12、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 end of the j
13、oint 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 unground end of
14、the other type of jointwith a solid rubber stopper.4.4 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 stopcoc
15、k to the vacuum pump isin the closed position, turn on the pump and adjust the stopcock1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E 41.01 onApparatus.Current edition approved Oct. 10, 2002. Published Nov
16、ember 2002. Originallypublished as E 676 79. Last previous edition E 676 84 (1998).2Annual Book of ASTM Standards, Vol 14.04.3Discontinued 1979U.S. Department of Commerce, Washington, DC 20234.4Available from American National Standards Institute, 1430 Broadway, NewYork, NY 10018.1Copyright ASTM Int
17、ernational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.to 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 t
18、hrough the matedjoints 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 fo
19、llows:Leak rate 5D3VT(1)where:DP = maximum change in differential pressure noted intest, mmHg or Pa,V = total evacuated volume, including manometer tubing,connections, flask, and joints, litres, andT = time of test, s.FIG. 1 Taper-Ground JointTABLE 1 Full-Length Taper-Ground JointsJoint Size A B CDe
20、signation 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 18.824/40 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.
21、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 61.5 mm is allowed on both inner and outer members.BA tolerance of + 0.15 mm is allowed on inner members, and a toleranceof 0.15 mm on outer members.TABLE 2 Medium-Length Taper-Ground JointsJ
22、oint 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 12.5 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
23、36.5 35 40.0AA tolerance of 61.5 mm is allowed on both inner and outer members.BA tolerance of + 0.15 mm is allowed on inner members, and a toleranceof 0.15 mm on outer members.E6760225. Sampling and Testing5.1 For sampling and testing refer to Specification E 1157.6. Product Marking6.1 Interchangea
24、ble 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 identifiedby the symbol is a s
25、tandard interchangeable size and type, andis manufactured within the tolerances permitted by this speci-fication. It shall not be used on joints, nor in advertisingdescriptions of joints, of any size or type other than thosedescribed in this specification.7. Packaging7.1 For packaging select from Sp
26、ecification E 920, E 921,or Practice E 1133.8. 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 10.0
27、10/10 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 61.5 mm is allowed on both inner and outer members.
28、BA tolerance of + 0.15 mm is allowed on inner members, and a toleranceof 0.15 mm 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 1
29、3 5.07/16 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 tolera
30、nce of 61.5 mm is allowed on both inner and outer members.BA tolerance of + 0.15 mm is allowed on inner members, and a toleranceof 0.15 mm on outer members.E676023ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this s
31、tandard. 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 must be re
32、viewed 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 therespons
33、ible 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 C700, West
34、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).NOTE 1Evacuated vo
35、lume 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 TestE676024
