ASTM D349-07
(Test Method)Standard Test Methods for Laminated Round Rods Used for Electrical Insulation
Standard Test Methods for Laminated Round Rods Used for Electrical Insulation
SIGNIFICANCE AND USE
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. Tensile properties may 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:
1.3 The values stated in inch-pound units are to be regarded as the standard.
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.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D349 − 07 AnAmerican National Standard
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
rials for Testing
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:
Section 4. Selection of Test Specimens
Compressive strength (axial) 20-25
Density 28-30 4.1 Specimens for tests shall be selected from portions of
Dielectric strength 31-39
material that are free of obvious defects unless the purpose of
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
as the standard.
5.1 In order to eliminate the effects of previous history of
1.4 This standard does not purport to address all of the
humidity exposure and to obtain reproducible results (Note 1),
safety concerns, if any, associated with its use. It is the
in all cases of dispute give the test specimens of laminated rods
responsibility of the user of this standard to establish appro-
a conditioning treatment for physical test as follows:
priate safety and health practices and determine the applica-
5.1.1 Tensile, Flexural, and Compressive Strengths, and
bility of regulatory limitations prior to use. For a specific
Density—Prior to test, condition the machined specimens in
warning statement see 36.2.
accordancewithProcedureBofPracticeD6054.Allspecimens
shall be tested at room temperature maintained at 23 6 5 °C.
2. Referenced Documents
2
2.1 ASTM Standards: NOTE 1—Conditioning of specimens may be undertaken: (a) for the
purpose of bringing the material into equilibrium with normal or average
D149 Test Method for Dielectric Breakdown Voltage and
room conditions of 23 °C and 50 % relative humidity; (b) simply to obtain
Dielectric Strength of Solid Electrical Insulating Materials
reproducible results, irrespective of previous history of exposure; or (c)to
at Commercial Power Frequencies
subject the material to abnormal conditions of temperature or humidity in
D570 Test Method for Water Absorption of Plastics
order to predict its service behavior.
D668 TestMethodsofMeasuringDimensionsofRigidRods
The conditions given here to obtain reproducible results may give
physical values somewhat higher or somewhat lower than values under
and Tubes Used for Electrical Insulation
equilibrium at normal conditions, depending upon the particular material
and test. To ensure substantial equilibrium under normal conditions of
1
These test methods are under the jurisdiction of ASTM Committee D09 on humidity and temperature, however, will require from 20 to 100 days or
Electrical and Electronic Insulating Materials and are the direct responsibility of
more depending upon thickness and type of material and its previous
Subcommittee D09.07 on Flexible and Rigid Insulating Materials.
history. Consequently, conditioning for reproducibility must of necessity
Current edition approved Feb. 1, 2007. Published February 2007. Originally
be used for general purchase specifications and product control tests.
approved in 1932. Last previous edition approved in 2004 as D349 – 99(2004).
DOI: 10.1520/D0349-07.
2 6. Dimensional Measurements
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
6.1 Make dimensional measurements of rods in accordance
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. with Test Methods D668.
*A Summary of Changes section appears at the end of t
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