ASTM D349-13
(Test Method)Standard Test Methods for Laminated Round Rods Used for Electrical Insulation (Withdrawn 2020)
Standard Test Methods for Laminated Round Rods Used for Electrical Insulation (Withdrawn 2020)
SIGNIFICANCE AND USE
7.1 This test method is designed to provide data for the control and specification of materials and for characterization purposes in research and development of new materials. It is possible that the tensile properties will vary with the size of specimens and the speed of testing. Consequently, these factors along with others noted herein must be controlled where precise comparative results are desired.
SCOPE
1.1 These test methods cover the procedures for testing rigid round rods used in electrical insulation. These round rods 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 round rods include vulcanized fiber and thermosetting laminates as well as round rods made from cast, molded, or extruded natural or synthetic resins, with or without fillers or reinforcing materials.
1.2 The procedures appear in the following sections:
Section
Compressive strength (axial)
20 – 25
Density
28 – 30
Dielectric strength
31 – 39
Flexural strength
13 – 19
Tensile strength
7 – 12
Water absorption
26-27
1.3 The values stated in inch-pound units are to be regarded as the standard.
1.4 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 warning statement see 36.2.
WITHDRAWN RATIONALE
These test methods cover the procedures for testing rigid round rods used in electrical insulation.
Formerly under the jurisdiction of Committee D09 on Electrical and Electronic Insulating Materials, these test methods were withdrawn in March 2020. This standard is being withdrawn without replacement because it is no longer being maintained.
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D349 − 13
Standard Test Methods for
1
Laminated Round Rods Used for Electrical Insulation
This standard is issued under the fixed designation D349; 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* D792 Test Methods for Density and Specific Gravity (Rela-
tive Density) of Plastics by Displacement
1.1 Thesetestmethodscovertheproceduresfortestingrigid
D1711 Terminology Relating to Electrical Insulation
round rods used in electrical insulation. These round rods
D6054 Practice for Conditioning Electrical Insulating Mate-
include many types made from fibrous sheets of basic
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rials for Testing (Withdrawn 2012)
materials, such as cellulose, glass, or nylon in the form of
paper, woven fabrics, or mats, bonded together by natural or
3. Terminology
synthetic resins, or by adhesives. Such round rods include
vulcanized fiber and thermosetting laminates as well as round
3.1 Definitions—Use Terminology D1711 for definitions of
rods made from cast, molded, or extruded natural or synthetic
terms used in these test methods and associated with electrical
resins, with or without fillers or reinforcing materials.
or electronic insulation materials.
1.2 The procedures appear in the following sections:
4. Selection of Test Specimens
Section
Compressive strength (axial) 20–25
4.1 Specimens for tests shall be selected from portions of
Density 28–30
material that are free of obvious defects unless the purpose of
Dielectric strength 31–39
Flexural strength 13–19 the test is to evaluate the effect of these defects.
Tensile strength 7–12
Water absorption 26-27
5. Conditioning
1.3 The values stated in inch-pound units are to be regarded
5.1 In order to eliminate the effects of previous history of
as the standard.
humidity exposure and to obtain reproducible results (Note 1),
1.4 This standard does not purport to address all of the
in all cases of dispute give the test specimens of laminated rods
safety concerns, if any, associated with its use. It is the
a conditioning treatment for physical test as follows:
responsibility of the user of this standard to establish appro-
5.1.1 Tensile, Flexural, and Compressive Strengths, and
priate safety and health practices and determine the applica-
Density—Prior to test, condition the machined specimens in
bility of regulatory limitations prior to use. For a specific
accordancewithProcedureBofPracticeD6054.Allspecimens
warning statement see 36.2.
shall be tested at room temperature maintained at 23 6 5 °C.
2. Referenced Documents
NOTE 1—The following are potential reasons to undertake conditioning
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of specimens: (a) for the purpose of bringing the material into equilibrium
2.1 ASTM Standards:
with normal or average room conditions of 23 °C and 50 % relative
D149 Test Method for Dielectric Breakdown Voltage and
humidity; (b) simply to obtain reproducible results, irrespective of
Dielectric Strength of Solid Electrical Insulating Materials
previous history of exposure; or (c) to subject the material to abnormal
at Commercial Power Frequencies conditions of temperature or humidity in order to predict its service
behavior.
D570 Test Method for Water Absorption of Plastics
The conditions given here to obtain reproducible results will give
D668 TestMethodsofMeasuringDimensionsofRigidRods
physical values which could be somewhat higher or somewhat lower than
and Tubes Used for Electrical Insulation
values under equilibrium at normal conditions, depending upon the
particular material and test. To ensure substantial equilibrium under
normal conditions of humidity and temperature, however, will require
1
These test methods are under the jurisdiction of ASTM Committee D09 on
from 20 to 100 days or more depending upon thickness and type of
Electrical and Electronic Insulating Materials and are the direct responsibility of
material and its previous history. Consequently, conditioning for repro-
Subcommittee D09.07 on Flexible and Rigid Insulating Materials.
ducibility must of necessity be used for general purchase specifications
Current edition approved Nov. 1, 2013. Published November 2013. Originally
and product control tests.
approved in 1932. Last previous edition approved in 2007 as D349 – 07. DOI:
10.1520/D0349-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
*A Summary of Changes section appears at
...
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