1、Designation: E911 98 (Reapproved 2015)Standard Specification forGlass Stopcocks with Polytetrafluoroethylene (PTFE) Plugs1This standard is issued under the fixed designation E911; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 year of last revision. 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 standard dimensional require-ments for obtaining, within practical limits, intercha
3、ngeabilityin glass stopcocks (Note 1) with polytetrafluoroethylene(PTFE) plugs for ordinary laboratory and industrial applica-tions. It covers dimensional interchangeability only and doesnot involve design characteristics of the item except wherespecified, nor does it involve physical or chemical ch
4、aracter-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 inassembled configuration.NOTE 2Glass stopcocks with glass plugs are covered by Specificatio
5、nE675.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 Standards.NOTE 4Although glass is the most common material for stopcocks,other materials
6、may be used as specified. Stopcocks constructed fromglass shall be in accordance with Specifications E438 and E671.2. Referenced Documents2.1 ASTM Standards:2D374 Test Methods for Thickness of Solid Electrical Insu-lation (Withdrawn 2013)3D1457 Specification for Polytetrafluoroethylene (PTFE)Molding
7、 and Extrusion Materials (Withdrawn 1996)3E438 Specification for Glasses in Laboratory ApparatusE671 Specification for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory ApparatusE675 Specification for Interchangeable Taper-Ground Stop-cocks And StoppersE920 Specification for
8、Commercially Packaged LaboratoryApparatusE921 Specification for Export Packaged Laboratory Appa-ratusE1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus for United States Government Procure-mentsE1157 Specification for Sampling and Testing of ReusableLaboratory Glassware2.2 Othe
9、r 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 Specification D1457Types I and IV, extrusion and molding grade resins.4. Requirements for Single Straight-Bore St
10、opcocks4.1 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 have ataper of 2 6 0.006 mm of diameter per 10 mm of length (1 to5).NOTE 5The lines of contact of the mating surfaces should form aconical
11、 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 and dimensions for single oblique-bore stopcocks are shown in
12、 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).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 Tabl
13、e 3.1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onLaboratory Ware and Supplies.Current edition approved June 1, 2015. Published July 2015. Originally approvedin 1982. Last previous edition approved
14、 in 2009 as E911 98 (2009) . DOI:10.1520/E0911-98R15.2For 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 Document Summary page onthe ASTM website.3The las
15、t approved version of this historical standard is referenced onwww.astm.org.4Commercial Standards and Product Standards are available from NationalInstitute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070,Gaithersburg, MD 20899-1070, http:/www.nist.gov.Copyright ASTM International, 100
16、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 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
17、 by the nominal boresize. With the exception of the bore sizes, the dimensions andtolerances 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 sing
18、le-borestopcocks (see Table 1).7.2 Taper (Note 3)All T-bore and 120 bore stopcocksshall 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 D374, except that micrometrecalipers graduated to
19、0.01 mm shall be used.8.2 TaperMeasure taper by using a sine bar and plate or anair gage.8.3 Leak RateUse the leak test apparatus illustrated in Fig.4, or one functionally similar to it. Suspend weights of 500 to1500 g from the test plug to apply downward force for properlyseating the plug in the ba
20、rrel. Conduct the test as follows:8.3.1 Check the apparatus setup, Fig. 1, for any leakageunder 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.Rem
21、ove the plug and repeat cleaning of both surfaces.8.3.4 Attach stopcock T to rubber 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
22、Suspend weight W under the tested plug in such amanner that the gravitational force 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
23、 A clockwise to connect stopcock T tovacuum, thus evacuating the stem to the test stopcock.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
24、gently; then measure and recordthe pressure change (in millimetres of mercury or kilopascals)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 beconsidered acceptab
25、le if the manometer reading indicates apressure increase of not more than 30-mm Hg (4 kPa), after 60s with downward force applied by a 500-g weight. All otherFIG. 1 StopcockTABLE 1 Single Straight-Bore StopcocksStopcock Designationand Bore of Hole inPlug B,mmDiameter of Plug atCenterline of BoreD,mm
26、Length of Shell E,mm1 110.06 250.52 110.06 250.53 15.20.10 300.54 15.20.10 300.56 160.20 350.5FIG. 2 Single Oblique-Bore StopcockTABLE 2 Single Oblique-Bore StopcocksStopcockDesignationand Bore ofHoleinPlugB,mmDiameter ofPlug atCenterline ofHole nearLarge EndD,mmLength ofShell E,mmAxial Distancefrom
27、 Large Endof Shellto Holeat DN,mmAxial DistanceBetween BoreHoles P,mm2 15.90.20 300.5 11.50.5 80.5FIG. 3 Double Oblique-Bore (3-Way) StopcockE911 98 (2015)2stopcocks shall be considered acceptable if the manometerreading indicates a pressure increase of not more than 30 mmHg after 60 s with downward
28、 force applied by a 1500-g weight.9. Marking9.1 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
29、purchasers that the item identified by the symbolis 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 t
30、hose described in this specification.10. Sampling and Testing10.1 For sampling and testing refer to Specification E1157.11. Packaging11.1 For packaging, select from Specification E920, Speci-fication E921, or Practice E1133.12. Keywords12.1 glass; PTFE; stopcocksTABLE 3 Double Oblique-Bore (3-Way) S
31、topcocksStopcockDesignationand Bore of Hole 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 to
32、Opening Nearest SmallEndS,mm1 12.90.06 440.5 220.5 9.40.5 8.10.52 12.90.06 440.5 220.5 9.40.5 8.10.53 14.40.10 440.5 220.5 10.40.5 9.00.54 14.40.10 440.5 220.5 10.40.5 9.00.5FIG. 4 Schematic Representation of Leak Test ApparatusE911 98 (2015)3ASTM International takes no position respecting the valid
33、ity 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 standard is subje
34、ct 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 International Headquart
35、ers. 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 below.This standard
36、 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 98 (2015)4
