ASTM D374M-13

Standard Test Methods for Thickness of Solid Electrical Insulation (Metric) (Withdrawn 2016)

SIGNIFICANCE AND USE
5.1 Some electrical properties, such as dielectric strength, vary with the thickness of the material. Determination of certain properties, such as relative permittivity (dielectric constant) and volume resistivity, usually require a knowledge of the thickness. Design and construction of electrical machinery require that the thickness of insulation be known.
SCOPE
1.1 These test methods cover the determination of the thickness of several types of solid electrical insulating materials employing recommended techniques. Use these test methods except as otherwise required by a material specification.  
1.2 The values stated in SI units are the standard.  
1.3 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.
WITHDRAWN RATIONALE
These test methods cover the determination of the thickness of several types of solid electrical insulating materials employing recommended techniques. Use these test methods except as otherwise required by a material specification.
Formerly under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials, these test methods were withdrawn in June 2016 and replaced by Test Methods D374/D374M for Thickness of Solid Electrical Insulation.

General Information

• Status: Withdrawn
• Publication Date: 31-Oct-2013
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.12 - Electrical Tests

Relations

• Replaced By: ASTM D374/D374M-16 - Standard Test Methods for Thickness of Solid Electrical Insulation
• Effective Date: 23-Aug-2016
• Referred By: ASTM D6343-14(2018) - Standard Test Methods for Thin Thermally Conductive Solid Materials for Electrical Insulation and Dielectric Applications
• Effective Date: 01-Nov-2013
• Referred By: ASTM D7812-22 - Standard Test Method for Tensile Testing of Aramid Paper
• Effective Date: 01-Nov-2013

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D374M −13
StandardTest Methods for
1
Thickness of Solid Electrical Insulation (Metric)
This standard is issued under the fixed designation D374M; 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* 4. Summary of Test Methods
1.1 These test methods cover the determination of the 4.1 This standard provides eight different test methods for
thickness of several types of solid electrical insulating materi- the measurement of thickness of solid electrical insulation
als employing recommended techniques. Use these test meth- materials. The test methods (identified as Methods A through
ods except as otherwise required by a material specification. H) employ different micrometers that exert various pressures
for varying times upon specimens of different geometries.
1.2 The values stated in SI units are the standard.
Table 1 and Table 2 display basic differences of each test
1.3 This standard does not purport to address all of the
method and identify methods applicable for use on various
safety concerns, if any, associated with its use. It is the
categories of materials.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 Some electrical properties, such as dielectric strength,
vary with the thickness of the material. Determination of
2. Referenced Documents
certain properties, such as relative permittivity (dielectric
2
2.1 ASTM Standards:
constant) and volume resistivity, usually require a knowledge
D1711 Terminology Relating to Electrical Insulation
of the thickness. Design and construction of electrical machin-
D6054 Practice for Conditioning Electrical Insulating Mate-
ery require that the thickness of insulation be known.
3
rials for Testing (Withdrawn 2012)
E252 Test Method for Thickness of Foil, Thin Sheet, and 6. Apparatus
Film by Mass Measurement
4
6.1 Apparatus A— Machinist’s Micrometer Caliper with
Calibrated Ratchet or Friction Thimble:
3. Terminology
6.1.1 ApparatusAis a micrometer caliper without a locking
3.1 Refer to Terminology D1711 for definitions pertinent to
device but is equipped with either a calibrated ratchet or a
this standard.
friction thimble. By use of a proper manipulative procedure
andacalibratedspring(seeAnnexA1),thepressureexertedon
3.2 Definitions of Terms Specific to This Standard:
3.2.1 absolute uncertainty (of a measurement), n—the the specimen is controllable.
6.1.2 Use an instrument constructed with a vernier capable
smallest division that may be read directly on the instrument
used for measurement. of measurement to the nearest 2 µm.
6.1.3 Use an instrument with the diameter of the anvil and
3.2.2 micrometer, n—an instrument for measuring any di-
spindle surfaces (which contact the specimen) of 6.25 6 0.05
mension with absolute uncertainty of 25 µm or smaller.
mm.
3.2.3 1micron,µm,n—adimensionequivalentto0.0000010
6.1.4 Use an instrument conforming to the requirements of
m.
7.1, 7.2, 7.5, 7.6.1, and 7.6.2.
6.1.5 Periodically, test the micrometer for conformance to
1 the requirements of 6.1.4.
These test methods are under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and are the direct responsibility of
6.2 Apparatus B—Machinist’s Micrometer without a
Subcommittee D09.12 on Electrical Tests.
Ratchet:
Current edition approved Nov. 1, 2013. Published November 2013. Originally
approved in 1968. Last previous edition approved in 2005 as D374M – 99(2005). 6.2.1 Apparatus B is a micrometer caliper without a locking
DOI: 10.1520/D0374M-13.
device.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2.2 Use an instrument constructed with a vernier capable
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
of measurement to the nearest 2 µm.
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
4
www.astm.org. Hereinafter referred to as a machinist’s micrometer.
*A Summary of Changes section appears at the end of this standard
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D374M−13
TABLE 1 Methods Suitable for Specific Materials
6.3.2 The preferred design and construction of manually
Material Method operated dead-weight dial-type micrometers calls for a limit on
Plastic sheet and film A B C or
...