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ASTM D1082-00

(Test Method)

Standard Test Method for Dissipation Factor and Permittivity (Dielectric Constant) of Mica

Standard Test Method for Dissipation Factor and Permittivity (Dielectric Constant) of Mica

SCOPE
1.1 This test method covers the determination of the dissipation factor and the relative permittivity of natural block mica having thicknesses between 0.007 and 0.030 in. (0.18 and 0.77 mm) and mica films or capacitor splits between 0.0008 and 0.004 in. (0.02 and 0.10 mm) in thickness.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information purposes only.  
1.3 This standard does not purport to address all of the safety problems, 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. >A specific warning statement is given in Section 7 and Note 4.

General Information

Status
Historical
Publication Date
09-Apr-2000
ICS
73.080 - Non-metalliferous minerals
Technical Committee
D09 - Electrical and Electronic Insulating Materials
Current Stage
Ref Project

Relations

Replaced By
ASTM D1082-00(2005) - Standard Test Method for Dissipation Factor and Permittivity (Dielectric Constant) of Mica
Effective Date
10-Apr-2000
Referred By
ASTM D748-18 - Standard Specification for Natural Block Mica and Mica Films Suitable for Use in Fixed Mica-Dielectric Capacitors
Effective Date
10-Apr-2000

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ASTM D1082-00 - Standard Test Method for Dissipation Factor and Permittivity (Dielectric Constant) of MicaASTM D1082-00 - Standard Test Method for Dissipation Factor and Permittivity (Dielectric Constant) of Mica
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ASTM D1082-00 - Standard Test Method for Dissipation Factor and Permittivity (Dielectric Constant) of Mica
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D1082–00
Standard Test Method for
Dissipation Factor and Permittivity (Dielectric Constant) of
Mica
This standard is issued under the fixed designation D 1082; 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 3. Summary of Test Method
1.1 This test method covers the determination of the dissi- 3.1 Any of the techniques and apparatus set forth in Test
pation factor and the relative permittivity of natural block mica Method D 150 may be used for measuring dissipation factor
having thicknesses between 0.007 and 0.030 in. (0.18 and 0.77 and relative permittivity of block mica or film. Select an
mm) and mica films or capacitor splits between 0.0008 and appropriate electrode system from those given in Section 5.
0.004 in. (0.02 and 0.10 mm) in thickness. 3.2 If a relative order of magnitude of dissipation factor is
1.2 The values stated in inch-pound units are to be regarded desired, the use of Method A in the Appendix of Specification
as the standard. The values in parentheses are for information D 748 is satisfactory.
purposes only.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 The dissipation factor of natural muscovite mica, as
safety problems, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- determined by this test method, is of practical importance as a
measure of the electrical energy lost as heat in the mica serving
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. Aspecific warning as the dielectric substance of capacitors, or in other applica-
tions in which the electric field is applied perpendicular to the
statement is given in Section 7 and Note 5.
plane of cleavage. The dissipation factor is particularly impor-
NOTE 1—Procedures for the measurement of dissipation factor and
tantinapplicationsusingmicaatradiofrequenciesandinsome
permittivity are given in IEC Publication 60371-2, but the details of the
lessextensiveaudiofrequencyapplications.Thistestmethodis
procedure are somewhat different from those specified in this test method.
suitable for specification acceptance and dielectric-loss control
2. Referenced Documents
tests (See the Significance and Use of Test Methods D 150).
4.2 Relative Permittivity (Dielectric Constant)—The per-
2.1 ASTM Standards:
mittivity of natural muscovite mica is a measure of its relative
D 150 Test Methods for A-C Loss Characteristics and
ability to store electrostatic energy. Since the relative permit-
Permittivity (Dielectric Constant) of Solid Electrical Insu-
tivity perpendicular to the cleavage plane is fairly uniform,
lating Materials
regardless of origin, its practical significance is mainly for
D 374 Test Methods for Thickness of Solid Electrical Insu-
identification purposes, special uses, research, and design. If a
lation
loss index is desired, the value of the permittivity must be
D 748 SpecificationforNaturalBlockMicaandMicaFilms
known (see the Significance and Use of Test Methods D 150).
Suitable for Use in Fixed Mica-Dielectric Capacitors
D 1711 Terminology Relating to Electrical Insulation
5. Apparatus
2.2 IEC Publication:
5.1 For a general description of apparatus suitable for
Publication 60371-2 Specification for insulating materials
measuring dissipation factor and relative permittivity, refer to
based on mica—Part 2: Methods of test
Test Methods D 150.
5.2 Select a suitable electrode arrangement from the follow-
ing:
This test method is under the jurisdiction of ASTM Committee D09 on
5.2.1 Steel Electrodes—Three electrodes made of stainless
Electrical and Electronic Insulating Materials and is the direct responsibility of
steel or nickel-plated tool steel will be required.The electrodes
Subcommittee D09.19 on Dielectric Sheet and Roll Products.
Current edition approved Apr. 10, 2000. Published June 2000. Originally
shall be cylindrical in shape and of a diameter sufficient to
e1
published as D 1082 – 49 T. Last previous edition D 1082 – 87 (1993) .
provide the minimum specified capacitance (Note 2). The
Annual Book of ASTM Standards, Vol 10.01.
3 nd upper and lower electrodes shall have a minimum axial length
Available from American National Standards Institute, 11 W. 42 St., 13th
Floor, New York, NY 10036. of ⁄2 in. (12.7 mm) and the center electrode shall have a
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D1082–00
maximum length of ⁄4 in. (6.35 mm).Alow-resistance contact air to escape as the mercury rises. With the test specimens
and conductor to the electrode is essential for dissipation factor clamped in position, the electrodes shall be in good alignment.
measurements in the order of 0.0001. The upper and lower As in the case of the flat, steel electrodes, a two-terminal
electrodes shall be electrically connected together, thus form- capacitor is formed with the center electrode serving as the
ing a two-terminal capacitor, with the center electrode serving active or measuring terminal with the outer electrodes that are
as the active or measuring terminal. The surfaces of the connected together by the steel yoke at the ground.
electrodes adjacent to the specimen shall be ground and
NOTE 3—Mercury electrodes having diameters of 1 ⁄4 in. (44.5 mm)
polished optically flat, and shall be parallel to each other. The
have been found satisfactory for mica specimens 2 by 2 in. by 0.001 to
upper electrode shall be provided with a recess for a steel ball,
0.030 in. (51 by 51 mm by 0.025 to 0.76 mm).
so that the applied pressure will be uniformly distributed. The NOTE 4—Conducting paint electrodes can be substituted for mercury
electrodes.
electrodes shall be carefully and accurately aligned without
scratchingthesurfaceofthemicaspecimen.Itisrecommended
5.2.3 Lead-Foil Electrodes—The use of lead-foil electrodes
that a slotted V-shaped jig be provided to aid with the aligning
0.0005 in. (0.013 mm) in thickness and 2.0 in. (51 mm) in
of the electrodes.
diameter is satisfactory for block mica 0.015 to 0.030 in. (0.38
to 0.76 mm) in thickness. (See also metal-foil electrodes
3 1 1
NOTE 2—Steel electrodes having diameters of ⁄4,1,1 ⁄4 , and 1 ⁄2 in.
described in the Section of Test Methods D-150 under Elec-
(19, 25, 32, and 38 mm) have been found satisfactory for practical
thicknesses of mica specimens. trode Systems).
5.3 The apparatus for the rapid, direct-reading method is set
5.2.2 Mercury Electrodes—Three hollow, stainless steel or
forth inAppendix of Specification D 748. This technique is for
nickel-platedcold-rolledsteelelectrodesmountedwiththeaxis
use only where classification of relative magnitude of dissipa-
horizontalsothatthetestspecimensareinaverticalplane,will
tion factor (or its reciprocal Q value) of block mica or films is
be required as shown in Fig. 1.The electrode assembly shall be
desired.
cylindrical in shape and of the same outside diameter, which
5.4 Thickness-measuring apparatus shall conform to the
shall be large enough to provide the minimum specified
requirements set forth inTest MethodAofTest MethodsD 374
capacitance (Note 3). Two adjustable electrodes having axial
which describes a machinist’s micrometer caliper with a
lengths of approximately ⁄4 in. (19 mm), provided with
ratchet or friction thimble.
suitable cavities, shall be mounted on screws in a solid
stainless steel or nickel-
...

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SIGNIFICANCE AND USE
4.1 The dissipation factor of natural muscovite mica, as determined by this test method, is of practical importance as a measure of the electrical energy lost as heat in the mica serving as the dielectric substance of capacitors, or in other applications in which the electric field is applied perpendicular to the plane of cleavage. The dissipation factor is particularly important in applications using mica at radio frequencies and in some less extensive audio frequency applications. This test method is suitable for specification acceptance and dielectric-loss control tests (see the Significance and Use of Test Methods D150).  
4.2 Relative Permittivity (Dielectric Constant)—The permittivity of natural muscovite mica is a measure of its relative ability to store electrostatic energy. Since the relative permittivity perpendicular to the cleavage plane is fairly uniform, regardless of origin, its practical significance is mainly for identification purposes, special uses, research, and design. If a loss index is desired, the value of the permittivity must be known (see the Significance and Use of Test Methods D150).
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1.1 This test method covers the determination of the dissipation factor and the relative permittivity of natural block mica having thicknesses between 0.007 and 0.030 in. (0.18 and 0.77 mm) and mica films or capacitor splits between 0.0008 and 0.004 in. (0.02 and 0.10 mm) in thickness.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information purposes only.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. A specific warning statement is given in Section 7 and 6.1.1.  
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1.6.2 Form 2—Partially-trimmed natural block mica, 0.007 in. minimum thickness.  
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SIGNIFICANCE AND USE
4.1 The dissipation factor of natural muscovite mica, as determined by this test method, is of practical importance as a measure of the electrical energy lost as heat in the mica serving as the dielectric substance of capacitors, or in other applications in which the electric field is applied perpendicular to the plane of cleavage. The dissipation factor is particularly important in applications using mica at radio frequencies and in some less extensive audio frequency applications. This test method is suitable for specification acceptance and dielectric-loss control tests (see the Significance and Use of Test Methods D150).  
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