1、Designation: E 911 98 (Reapproved 2004)Standard Specification forGlass Stopcocks with Polytetrafluoroethylene (PTFE) Plugs1This standard is issued under the fixed designation E 911; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, t
2、he year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers
3、 standard dimensional require-ments for obtaining, within practical limits, interchangeabilityin glass stopcocks (Note 1) with polytetrafluoroethylene(PTFE) plugs for ordinary laboratory and industrial applica-tions. It covers dimensional interchangeability only and doesnot involve design characteri
4、stics of the item except wherespecified, nor does it involve physical or chemical character-istics of the material used. It does not cover glass stopcockswith glass plugs (Note 2) or stopcocks intended for use inhigh-vacuum work.NOTE 1A stopcock is defined as consisting of a plug and barrel inassemb
5、led configuration.NOTE 2Glass stopcocks with glass plugs are covered by SpecificationE 675.NOTE 3The dimensions pertaining to stopcocks were taken from thenow obsolete Commercial Standard CS 21-58 of the U.S. Department ofCommerce and Product Standard PS 28-70 published by the NationalBureau of Stan
6、dards.NOTE 4Although glass is the most common material for stopcocks,other materials may be used as specified. Stopcocks constructed fromglass shall be in accordance with Specifications E 438 and E 671.2. Referenced Documents2.1 ASTM Standards:2D 374 Test Methods for Thickness of Solid Electrical In
7、su-lationD 1457 Specification for Polytetrafluoroethylene (PTFE)Molding and Extrusion Materials3E 438 Specification for Glasses in Laboratory ApparatusE 671 Specification for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory ApparatusE 675 Specification for Interchangeable Ta
8、per-GroundStopcocks and StoppersE 920 Specification for Commercially Packaged LaboratoryApparatusE 921 Specification for Export Packaged Laboratory Appa-ratusE 1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus for United States Government Procure-mentsE 1157 Specification for S
9、ampling and Testing of ReusableLaboratory Glassware2.2 Other Standard:4PS 28-70 Glass Stopcocks With Polytetrafluoroethylene(PTFE) Plugs3. Material3.1 The PTFE material used to manufacture the plugs shallbe in accordance with the requirements of SpecificationD 1457 Types I and IV, extrusion and mold
10、ing grade resins.4. Requirements for Single Straight-Bore Stopcocks4.1 The designations and dimensions for single straight-bore stopcocks are shown in Fig. 1 and Table 1.4.2 Taper (Note 3)All straight-bore stopcocks shall havea taper of 2 6 0.006 mm of diameter per 10 mm of length (1to 5).NOTE 5The
11、lines of contact of the mating surfaces should form aconical section having a taper of 2 6 0.006 mm per 1 cm of axial length(before compression of the plug surface) for an axial distance of at least10 mm on each side of the bore.5. Requirements for Single Oblique-Bore Stopcocks5.1 The designations a
12、nd dimensions for single oblique-bore stopcocks are shown in Fig. 2 and Table 2.5.2 Taper (Note 4)All single oblique-bore stopcocks shallhave a taper of 2 6 0.006 mm of diameter per 10 mm of length(1 to 5).1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and
13、 is the direct responsibility of Subcommittee E41.01 onApparatus.Current edition approved May 1, 2004. Published May 2004. Originallyapproved in 1982. Last previous edition approved in 1998 as E 911 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Serv
14、ice at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.4Commercial Standards and Product Standards are available from NationalInstitute of Standards and Technology (NIST), 100 Bureau Dr., Stop 3460,Gaith
15、ersburg, MD 20899-3460.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Requirements for Double Oblique-Bore (3-Way)Stopcocks6.1 The designations and dimensions for double-oblique-bore stopcocks are shown in Fig. 3 and Table 3.6.2
16、Taper (Note 3)All double oblique-bore (3-way) stop-cocks shall have a taper of 2 6 0.006 mm of diameter per 10mm of length (1 to 5).7. Requirements for T-Bore and 120 Bore Stopcocks7.1 These stopcocks are designated by the nominal boresize. With the exception of the bore sizes, the dimensions andtol
17、erances for 1 and 2-mm T-bore and 120 bore stopcocks arethe same as for the 4-mm single straight-bore stopcocks.Dimensions and tolerances for 3 and 4-mm T-bore and 120bore stopcocks are the same as for the 6-mm single-borestopcocks (see Table 1).7.2 Taper (Note 3)All T-bore and 120 bore stopcockssha
18、ll have a taper of 2 6 0.006 mm of diameter per 10 mm oflength (1 to 5).8. Test Methods8.1 DimensionsDetermine dimensions in accordance withMethod B of Test Methods D 374, except that micrometrecalipers graduated to 0.01 mm shall be used.8.2 Taper Measure taper by using a sine bar and plate oran air
19、 gage.8.3 Leak RateUse the leak test apparatus illustrated inFig. 4, or one functionally similar to it. Suspend weights of 500to 1500 g from the test plug to apply downward force forproperly seating the plug in the barrel. Conduct the test asfollows:8.3.1 Check the apparatus setup, Fig. 1, for any l
20、eakageunder the test conditions before testing any stopcocks, T.8.3.2 Clean all surfaces of plug and shell with lint-freetissue or rinse with acetone.8.3.3 Firmly seat the plug into the shell by rotating the plug.Remove the plug and repeat cleaning of both surfaces.8.3.4 Attach stopcock T to rubber
21、tubing R, and secure theconnection.8.3.5 Mount stopcock T horizontally so that the plug handlewill be on top.8.3.6 Gently reseat the plug into the shell in a closedposition without applying tension or pressure.8.3.7 Suspend weight W under the tested plug in such amanner that the gravitational force
22、is applied uniformly.8.3.8 Turn stopcock A to connect the source of vacuum andbulb B; then evacuate to 0-mm reading on scale S of theclosed-end manometer, M. Tap the manometer gently beforereading.8.3.9 Turn stopcock A clockwise to connect stopcock T tovacuum, thus evacuating the stem to the test st
23、opcock.8.3.10 Turn stopcock A clockwise to connect stopcock T tobulb B.8.3.11 Time for 60 s and then turn stopcock A counter-clockwise to isolate the manometer from stopcock T andvacuum source.8.3.12 Tap manometer M gently; then measure and recordthe pressure change (in millimetres of mercury or kil
24、opascals)of scale S.8.4 PerformanceEvaluate the stopcocks for performancein accordance with 8.3 using the test apparatus illustrated inFig. 4. The 1, 2, 3, and 4-mm straight-bore stopcocks shall beFIG. 1 StopcockTABLE 1 Single Straight-Bore StopcocksStopcock Designationand Bore of Hole inPlug B,mmDi
25、ameter of Plug atCenterline of BoreD,mmLength of Shell E,mm1116 0.06 25 6 0.5216 0.06 25 6 0.53 15.2 6 0.10 30 6 0.54 15.2 6 0.10 30 6 0.5616 0.20 35 6 0.5FIG. 2 Single Oblique-Bore StopcockTABLE 2 Single Oblique-Bore StopcocksStopcockDesignationand Bore ofHoleinPlugB,mmDiameter ofPlug atCenterline
26、ofHole nearLarge End D,mmLength ofShell E,mmAxial Distancefrom Large Endof Shellto Holeat DN,mmAxial DistanceBetween BoreHoles P,mm2 15.9 6 0.20 30 6 0.5 11.5 6 0.5 8 6 0.5FIG. 3 Double Oblique-Bore (3-Way) StopcockE 911 98 (2004)2considered acceptable if the manometer reading indicates apressure in
27、crease of not more than 30-mm Hg (4 kPa), after 60s with downward force applied by a 500-g weight. All otherstopcocks shall be considered acceptable if the manometerreading indicates a pressure increase of not more than 30 mmHg after 60 s with downward force applied by a 1500-g weight.9. Marking9.1
28、Interchangeable glass stopcocks with PTFE plugs con-forming to this specification shall be marked on the glass barrelwith the symbolPS, the size designation, and trademark of themanufacturer or distributor. This symbol is the manufacturersassurance to purchasers that the item identified by the symbo
29、lis a standard interchangeable size and type described and ismanufactured within the tolerances permitted by this specifi-cation. It shall not be used on stopcocks nor in advertisingdescription of stopcocks or PTFE plugs of any size or typeother than those described in this specification.10. Samplin
30、g and Testing10.1 For sampling and testing refer to Specification E 1157.11. Packaging11.1 For packaging, select from Specification E 920, Speci-fication E 921, or Practice E 1133.12. Keywords12.1 glass; PTFE; stopcocksTABLE 3 Double Oblique-Bore (3-Way) StopcocksStopcockDesignationand Bore of Hole
31、in PlugB,mmDiameter of Plug atCenterlineof Openings at Center ofPlugD,mmLength of ShellE,mmAxial Distance from LargeEnd of Shell to Openingsat DN,mmAxial Distance fromOpenings atCenter to OpeningNearest LargeEnd R,mmAxial Distance fromOpenings at Center toOpening Nearest SmallEndS,mm1 12.9 6 0.06 44
32、 6 0.5 22 6 0.5 9.4 6 0.5 8.1 6 0.52 12.9 6 0.06 44 6 0.5 22 6 0.5 9.4 6 0.5 8.1 6 0.53 14.4 6 0.10 44 6 0.5 22 6 0.5 10.4 6 0.5 9.0 6 0.54 14.4 6 0.10 44 6 0.5 22 6 0.5 10.4 6 0.5 9.0 6 0.5FIG. 4 Schematic Representation of Leak Test ApparatusE 911 98 (2004)3ASTM International takes no position res
33、pecting the validity of any patent rights asserted in connection with any item mentionedin 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
34、standard is subject to revision at any time by the responsible technical committee and 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 Intern
35、ational Headquarters. Your comments will receive careful consideration at a meeting of 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 be
36、low.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box 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).E 911 98 (2004)4
