ASTM E911-98(2015)

Standard Specification for Glass Stopcocks with Polytetrafluoroethylene (PTFE) Plugs

ABSTRACT
This specification covers dimensional interchangeability requirements of glass stopcocks with polytetrafluoroethylene (PTFE) plugs for use in ordinary laboratory and industrial applications. However, it does not cover the design characteristics of the stopcock-plug assembly nor the physical or chemical properties of the materials used. Glass stopcocks with glass plugs or stopcocks for use in high-vacuum applications are not covered as well. The plug shall be manufactured from PTFE material of Types I and IV, extrusion and molding grade resins. Stopcocks, on the other hand, shall be manufactured from glass into one of various types: single straight-bore stopcock, single oblique-bore stopcock, double oblique-bore (three-way) stopcock, T-bore stopcock, or angled-bore stopcock. Tests for dimension conformity, taper, leak rate, and performance shall be performed and shall conform to the requirements specified.
SCOPE
1.1 This specification covers standard dimensional requirements for obtaining, within practical limits, interchangeability in glass stopcocks (Note 1) with polytetrafluoroethylene (PTFE) plugs for ordinary laboratory and industrial applications. It covers dimensional interchangeability only and does not involve design characteristics of the item except where specified, nor does it involve physical or chemical characteristics of the material used. It does not cover glass stopcocks with glass plugs (Note 2) or stopcocks intended for use in high-vacuum work.  
Note 1: A stopcock is defined as consisting of a plug and barrel in assembled configuration.
Note 2: Glass stopcocks with glass plugs are covered by Specification E675.
Note 3: The dimensions pertaining to stopcocks were taken from the now obsolete Commercial Standard CS 21-58 of the U.S. Department of Commerce and Product Standard PS 28-70 published by the National Bureau of Standards.
Note 4: Although glass is the most common material for stopcocks, other materials may be used as specified. Stopcocks constructed from glass shall be in accordance with Specifications E438 and E671.

General Information

• Status: Historical
• Publication Date: 31-May-2015
• ICS: 71.040.20 - Laboratory ware and related apparatus
• Technical Committee: E41 - Laboratory Apparatus
• Drafting Committee: E41.01 - Laboratory Ware and Supplies

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E911 −98 (Reapproved 2015)
Standard Specification for
1
Glass Stopcocks with Polytetrafluoroethylene (PTFE) Plugs
This standard is issued under the fixed designation E911; 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 E920 Specification for Commercially Packaged Laboratory
Apparatus
1.1 This specification covers standard dimensional require-
E921 Specification for Export Packaged Laboratory Appa-
ments for obtaining, within practical limits, interchangeability
ratus
in glass stopcocks (Note 1) with polytetrafluoroethylene
E1133 Practice for Performance Testing of Packaged Labo-
(PTFE) plugs for ordinary laboratory and industrial applica-
ratory Apparatus for United States Government Procure-
tions. It covers dimensional interchangeability only and does
ments
not involve design characteristics of the item except where
E1157 Specification for Sampling and Testing of Reusable
specified, nor does it involve physical or chemical character-
Laboratory Glassware
istics of the material used. It does not cover glass stopcocks
4
2.2 Other Standard:
with glass plugs (Note 2) or stopcocks intended for use in
PS 28-70 Glass Stopcocks With Polytetrafluoroethylene
high-vacuum work.
(PTFE) Plugs
NOTE 1—A stopcock is defined as consisting of a plug and barrel in
assembled configuration. 3. Material
NOTE 2—Glass stopcocks with glass plugs are covered by Specification
3.1 The PTFE material used to manufacture the plugs shall
E675.
be in accordance with the requirements of Specification D1457
NOTE 3—The dimensions pertaining to stopcocks were taken from the
now obsolete Commercial Standard CS 21-58 of the U.S. Department of
Types I and IV, extrusion and molding grade resins.
Commerce and Product Standard PS 28-70 published by the National
Bureau of Standards.
4. Requirements for Single Straight-Bore Stopcocks
NOTE 4—Although glass is the most common material for stopcocks,
4.1 The designations and dimensions for single straight-
other materials may be used as specified. Stopcocks constructed from
glass shall be in accordance with Specifications E438 and E671. bore stopcocks are shown in Fig. 1 and Table 1.
4.2 Taper (Note 3)—All straight-bore stopcocks shall have a
2. Referenced Documents
taper of 2 6 0.006 mm of diameter per 10 mm of length (1 to
2
2.1 ASTM Standards:
5).
D374 Test Methods for Thickness of Solid Electrical Insu-
3 NOTE 5—The lines of contact of the mating surfaces should form a
lation (Withdrawn 2013)
conical section having a taper of 2 6 0.006 mm per 1 cm of axial length
D1457 Specification for Polytetrafluoroethylene (PTFE)
(before compression of the plug surface) for an axial distance of at least
3
Molding and Extrusion Materials (Withdrawn 1996)
10 mm on each side of the bore.
E438 Specification for Glasses in Laboratory Apparatus
5. Requirements for Single Oblique-Bore Stopcocks
E671 Specification for Maximum Permissible Thermal Re-
sidual Stress in Annealed Glass Laboratory Apparatus
5.1 The designations and dimensions for single oblique-
E675 Specification for Interchangeable Taper-Ground Stop-
bore stopcocks are shown in Fig. 2 and Table 2.
cocks And Stoppers
5.2 Taper (Note 4)—All single oblique-bore stopcocks shall
have a taper of 2 6 0.006 mm of diameter per 10 mm of length
1 (1 to 5).
This specification is under the jurisdiction of ASTM Committee E41 on
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
6. Requirements for Double Oblique-Bore (3-Way)
Laboratory Ware and Supplies.
CurrenteditionapprovedJune1,2015.PublishedJuly2015.Originallyapproved
Stopcocks
in 1982. Last previous edition approved in 2009 as E911 – 98 (2009) . DOI:
6.1 The designations and dimensions for double-oblique-
10.1520/E0911-98R15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
bore stopcocks are shown in Fig. 3 and Table 3.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
4
the ASTM website. Commercial Standards and Product Standards are available from National
3
The last approved version of this historical standard is referenced on Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070,
www.astm.org. Gaithersburg, MD 20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E911−98 (2015)
FIG. 1Stopcock
FIG. 3Double Oblique-Bore (3-Way) Stopcock
TABLE 1 Single Straight-Bore Stopcocks
St
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E911 − 98 (Reapproved 2009) E911 − 98 (Reapproved 2015)
Standard Specification for
1
Glass Stopcocks with Polytetrafluoroethylene (PTFE) Plugs
This standard is issued under the fixed designation E911; 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
1.1 This specification covers standard dimensional requirements for obtaining, within practical limits, interchangeability in
glass stopcocks (Note 1) with polytetrafluoroethylene (PTFE) plugs for ordinary laboratory and industrial applications. It covers
dimensional interchangeability only and does not involve design characteristics of the item except where specified, nor does it
involve physical or chemical characteristics of the material used. It does not cover glass stopcocks with glass plugs (Note 2) or
stopcocks intended for use in high-vacuum work.
NOTE 1—A stopcock is defined as consisting of a plug and barrel in assembled configuration.
NOTE 2—Glass stopcocks with glass plugs are covered by Specification E675.
NOTE 3—The dimensions pertaining to stopcocks were taken from the now obsolete Commercial Standard CS 21-58 of the U.S. Department of
Commerce and Product Standard PS 28-70 published by the National Bureau of Standards.
NOTE 4—Although glass is the most common material for stopcocks, other materials may be used as specified. Stopcocks constructed from glass shall
be in accordance with Specifications E438 and E671.
2. Referenced Documents
2
2.1 ASTM Standards:
3
D374 Test Methods for Thickness of Solid Electrical Insulation (Withdrawn 2013)
3
D1457 Specification for Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials (Withdrawn 1996)
E438 Specification for Glasses in Laboratory Apparatus
E671 Specification for Maximum Permissible Thermal Residual Stress in Annealed Glass Laboratory Apparatus
E675 Specification for Interchangeable Taper-Ground Stopcocks And Stoppers
E920 Specification for Commercially Packaged Laboratory Apparatus
E921 Specification for Export Packaged Laboratory Apparatus
E1133 Practice for Performance Testing of Packaged Laboratory Apparatus for United States Government Procurements
E1157 Specification for Sampling and Testing of Reusable Laboratory Glassware
4
2.2 Other Standard:
PS 28-70 Glass Stopcocks With Polytetrafluoroethylene (PTFE) Plugs
3. Material
3.1 The PTFE material used to manufacture the plugs shall be in accordance with the requirements of Specification D1457
Types I and IV, extrusion and molding grade resins.
4. Requirements for Single Straight-Bore Stopcocks
4.1 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 a taper of 2 6 0.006 mm of diameter per 10 mm of length (1 to 5).
NOTE 5—The lines of contact of the mating surfaces should form a conical 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 least 10 mm on each side of the bore.
1
This specification is under the jurisdiction of ASTM Committee E41 on Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
ApparatusLaboratory Ware and Supplies.
Current edition approved Nov. 1, 2009June 1, 2015. Published February 2010 July 2015. Originally approved in 1982. Last previous edition approved in 20042009 as
E911 – 98 (2004)(2009) . DOI: 10.1520/E0911-98R09.10.1520/E0911-98R15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
4
Commercial Standards and Product Standards are available from National Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070, Gaithersburg, MD
20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E911 − 98 (2015)
FIG. 1 Stopcock
TABLE 1 Single Straight-Bore Stopcocks
Stopcock Designation Diameter of Plug at
and Bore of Hole in Centerline of Bore Length of Shell E, mm
Plug B, mm D, mm
1 11
...