ASTM D349-99(2004)

Standard Test Methods for Laminated Round Rods Used for Electrical Insulation

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, asbestos, 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:SectionCompressive strength (axial)DensityDielectric strengthFlexural strengthTensile strengthWater absorption-
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 .

General Information

• Status: Historical
• Publication Date: 09-Apr-1999
• ICS: 29.035.99 - Other insulating materials
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.07 - Electrical Insulating Materials

Relations

• Replaces: ASTM D349-99 - Standard Test Methods for Laminated Round Rods Used for Electrical Insulation
• Effective Date: 10-Apr-1999
• Replaced By: ASTM D349-07 - Standard Test Methods for Laminated Round Rods Used for Electrical Insulation
• Effective Date: 01-Feb-2007
• Referred By: ASTM D619-21 - Standard Test Methods for Vulcanized Fibre Used for Electrical Insulation
• Effective Date: 10-Apr-1999
• Referred By: ASTM D709-17 - Standard Specification for Laminated Thermosetting Materials
• Effective Date: 10-Apr-1999

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
An American National Standard
Designation:D349–99 (Reapproved 2004)
Standard Test Methods for
1
Laminated Round Rods Used for Electrical Insulation
This standard is issued under the fixed designation D 349; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 668 Test Methods of Measuring Dimensions of Rigid
Rods and Tubes Used for Electrical Insulation
1.1 Thesetestmethodscovertheproceduresfortestingrigid
D 792 TestMethodsforDensityandSpecificGravity(Rela-
round rods used in electrical insulation. These round rods
tive Density) of Plastics by Displacement
include many types made from fibrous sheets of basic materi-
D 1711 Terminology Relating to Electrical Insulation
als, such as cellulose, asbestos, glass, or nylon in the form of
D 6054 Practice for Conditioning Electrical Insulating Ma-
paper, woven fabrics, or mats, bonded together by natural or
terials for Testing
synthetic resins, or by adhesives. Such round rods include
vulcanized fiber and thermosetting laminates as well as round
3. Terminology
rods made from cast, molded, or extruded natural or synthetic
3.1 Definitions—Use Terminology D 1711 for definitions of
resins, with or without fillers or reinforcing materials.
terms used in these test methods and associated with electrical
1.2 The procedures appear in the following sections:
or electronic insulation materials.
Section
Compressive strength (axial) 20-25
4. Selection of Test Specimens
Density 28-30
Dielectric strength 31-39
4.1 Specimens for tests shall be selected from portions of
Flexural strength 13-19
material that are free of obvious defects unless the purpose of
Tensile strength 7-12
Water absorption 26-27
the test is to evaluate the effect of these defects.
1.3 The values stated in inch-pound units are to be regarded
5. Conditioning
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.
accordance with Procedure B of Practice D 6054. All speci-
2. Referenced Documents mens shall be tested at room temperature maintained at 23 6
2 5 °C.
2.1 ASTM Standards:
D 149 Test Method for Dielectric Breakdown Voltage and
NOTE 1—Conditioning of specimens may be undertaken: (a) for the
Dielectric Strength of Solid Electrical Insulating Materials purpose of bringing the material into equilibrium with normal or average
room conditions of 23 °C and 50 % relative humidity; (b) simply to obtain
at Commercial Power Frequencies
reproducible results, irrespective of previous history of exposure; or (c)to
D 570 Test Method for Water Absorption of Plastics
subject the material to abnormal conditions of temperature or humidity in
order to predict its service behavior.
1 The conditions given here to obtain reproducible results may give
These test methods are under the jurisdiction of ASTM Committee D09 on
physical values somewhat higher or somewhat lower than values under
Electrical and Electronic Insulating Materials and are the direct responsibility of
equilibrium at normal conditions, depending upon the particular material
Subcommittee D09.07 on Flexible and Rigid Insulating Materials.
Current edition approved April 10, 1999. Published June 1999. Originally and test. To ensure substantial equilibrium under normal conditions of
approved in 1932. Last previous edition approved in 1997 as D 349 – 92 (1997).
humidity and temperature, however, will require from 20 to 100 days or
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
more depending upon thickness and type of material and its previous
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
history. Consequently, conditioning for reproducibility must of necessity
Standards volume information, refer to the standard’s Document Summary page on
be used for general purchase specifications and product control tests.
the ASTM website.
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