ASTM D1082-00(2005)
(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
SIGNIFICANCE AND USE
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 D 150).
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 D 150).
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.
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 and . Note 1
Procedures for the measurement of dissipation factor and permittivity are given in IEC Publication 60371-2, but the details of the procedure are somewhat different from those specified in this test method.
General Information
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Standards Content (Sample)
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An American National Standard
Designation:D1082–00 (Reapproved 2005)
Standard Test Method for
Dissipation Factor and Permittivity (Dielectric Constant) of
1
Mica
This standard is issued under the fixed designation D1082; 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 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 Methods D150 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 D748 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 6.1.1.
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 D150).
2
4.2 Relative Permittivity (Dielectric Constant)—The per-
2.1 ASTM Standards:
mittivity of natural muscovite mica is a measure of its relative
D150 Test Methods for AC Loss Characteristics and Per-
ability to store electrostatic energy. Since the relative permit-
mittivity (Dielectric Constant) of Solid Electrical Insula-
tivity perpendicular to the cleavage plane is fairly uniform,
tion
regardless of origin, its practical significance is mainly for
D374 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
D748 Specification for Natural Block Mica and Mica Films
known (see the Significance and Use of Test Methods D150).
Suitable for Use in Fixed Mica-Dielectric Capacitors
2.2 IEC Publication:
5. Apparatus
Publication 60371-2 Specification for insulating materials
3
5.1 For a general description of apparatus suitable for
based on mica—Part 2: Methods of test
measuring dissipation factor and relative permittivity, refer to
Test Methods D150.
1
This test method is under the jurisdiction of ASTM Committee D09 on
5.2 Select a suitable electrode arrangement from the follow-
Electrical and Electronic Insulating Materials and is the direct responsibility of
ing:
Subcommittee D09.19 on Dielectric Sheet and Roll Products.
Current edition approved Apr. 10, 2000. Published June 2000. Originally 5.2.1 Steel Electrodes—Three electrodes made of stainless
´1
approved in 1949. Last previous edition approved in 1993 as D1082 – 87 (1993) .
steel or nickel-plated tool steel will be required.The electrodes
DOI: 10.1520/D1082-00R05.
shall be cylindrical in shape and of a diameter sufficient to
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
provide the minimum specified capacitance (Note 2). The
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on upper and lower electrodes shall have a minimum axial length
the ASTM website. 1
of ⁄2 in. (12.7 mm) and the center electrode shall have a
3
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
1
maximum length of
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