ASTM D348-07
(Test Method)Standard Test Methods for Rigid Tubes Used for Electrical Insulation
Standard Test Methods for Rigid Tubes Used for Electrical Insulation
SIGNIFICANCE AND USE
Tension tests, properly interpreted, provide information with regard to the tensile properties of rigid tubing, when employed under conditions approximating those under which the tests are made. The tensile strength values may vary with the size of the tube and with the temperature and atmospheric conditions. Tension tests may provide data for research and development and for engineering design, and are useful for quality control purposes.
SCOPE
1.1 These test methods cover the testing of rigid tubes used in electrical insulation. These tubes include many types made from fibrous sheets of basic materials, such as cellulose, glass, or nylon, in the form of paper, woven fabrics, or mats, bonded together by natural or synthetic resins or by adhesives. Such tubes include vulcanized fiber and thermosetting laminates, as well as tubes made from cast, molded, or extruded natural or synthetic resins, with or without fillers or reinforcing materials.
1.2 Tubes tested by these test methods are most commonly circular in cross section; however, noncircular shapes are also in commercial use. To the extent that the individual methods are compatible with a particular noncircular shape, these test methods are applicable to these other shapes. For tests on noncircular tubes, appropriate comments should be included in the test report, including details of orientation of test specimens with respect to the cross section of the tube.
1.3 The procedures appear in the following sections:
1.4 The values stated in inch-pound units are to be regarded as the standard. SI units in parentheses are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement, see 27.1.1.
General Information
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D348 − 07 AnAmerican National Standard
Standard Test Methods for
1
Rigid Tubes Used for Electrical Insulation
This standard is issued under the fixed designation D348; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* bility of regulatory limitations prior to use. For a specific
hazard statement, see 27.1.1.
1.1 These test methods cover the testing of rigid tubes used
in electrical insulation. These tubes include many types made
2. Referenced Documents
from fibrous sheets of basic materials, such as cellulose, glass,
2
2.1 ASTM Standards:
or nylon, in the form of paper, woven fabrics, or mats, bonded
D149 Test Method for Dielectric Breakdown Voltage and
together by natural or synthetic resins or by adhesives. Such
Dielectric Strength of Solid Electrical Insulating Materials
tubes include vulcanized fiber and thermosetting laminates, as
at Commercial Power Frequencies
well as tubes made from cast, molded, or extruded natural or
D150 Test Methods forAC Loss Characteristics and Permit-
synthetic resins, with or without fillers or reinforcing materials.
tivity (Dielectric Constant) of Solid Electrical Insulation
1.2 Tubes tested by these test methods are most commonly
D570 Test Method for Water Absorption of Plastics
circular in cross section; however, noncircular shapes are also
D668 TestMethodsofMeasuringDimensionsofRigidRods
in commercial use. To the extent that the individual methods
and Tubes Used for Electrical Insulation
are compatible with a particular noncircular shape, these test
D1711 Terminology Relating to Electrical Insulation
methods are applicable to these other shapes. For tests on
E4 Practices for Force Verification of Testing Machines
noncircular tubes, appropriate comments should be included in
thetestreport,includingdetailsoforientationoftestspecimens
3. Terminology
with respect to the cross section of the tube.
3.1 Definitions— For definitions of terms used in these test
1.3 The procedures appear in the following sections:
methods, refer to Terminology D1711.
ASTM Test
Method
4. Conditioning
Procedure Sections Reference
4.1 In order to eliminate the effects of previous history of
Compressive Strength (Axial and Diametral) 12 to 17 E4
humidity exposure and to obtain reproducible results (Note 1),
Conditioning. 4 .
the test specimens in all cases of dispute, shall be given a
Density 20 to 24 .
Dielectric Strength 25 to 32 D149
conditioning treatment for physical tests (Note 2) as follows:
Dimensional Measurements 5 D668
4.1.1 Tensile Strength, Compressive Strength (Axial and
Dissipation Factor and Permittivity 33 to 35 D150
Diametral), and Density—Condition the machined specimens
Tensile Strength 6 to 11 E4
Water Absorption 18 to 19 D570
prior to test by drying in an air-circulating oven for 48 h at 50
1.4 The values stated in inch-pound units are to be regarded 6 3 °C, followed by cooling to room temperature in a
desiccator. In either case, all specimens shall be tested at room
as the standard. SI units in parentheses are for information
only. temperature maintained at 23 6 2 °C, 50 % relative humidity.
1.5 This standard does not purport to address all of the
NOTE 1—Conditioning of specimens may be undertaken: (a) for the
safety concerns, if any, associated with its use. It is the purpose of bringing the material into equilibrium with standard laboratory
atmospheric conditions of 23 °C and 50 % relative humidity; (b) simply to
responsibility of the user of this standard to establish appro-
obtain reproducible results, irrespective of previous history of exposure;
priate safety and health practices and determine the applica-
or (c) to subject the material to abnormal conditions of temperature or
humidity in order to predict its service behavior.
The conditions given here to obtain reproducible results may give
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These test methods are under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and are the direct responsibility of
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Subcommittee D09.07 on Flexible and Rigid Insulating Materials. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Feb. 1, 2007. Published February 2007. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1932. Last previous edition approved in 2000 as D348 – 00. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D0348-07. the ASTM website.
*A Summary of Changes section appears at the end of
...
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