ASTM D2131-97(2003)
(Specification)Standard Specification for Natural Muscovite Mica Splittings
Standard Specification for Natural Muscovite Mica Splittings
SCOPE
1.1 This specification covers the determination of muscovite mica splittings of standard commercial grades and specifies the maximum allowable physical defects for each grade. It is applicable to commercially available natural muscovite mica splittings regardless of the basic color of the mica or its source.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard is very similar to ISO 6386. It is expected that materials would be classified identically using the criteria of either standard. The grades shown under "ASTM Grade No." in Table 1 and Table 2 are shown under "Old Grade No." in ISO 6386.
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An American National Standard
Designation: D 2131 – 97 (Reapproved 2003)
Standard Classification for
Natural Muscovite Mica Splittings
This standard is issued under the fixed designation D 2131; 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 4.2 Thirteen grades, based on size and form, are described
as given in Table 1.
1.1 Thisspecificationcoversthedeterminationofmuscovite
4.3 Within the grades, up to thirteen categories of visual
mica splittings of standard commercial grades and specifies the
quality may be separately specified, as listed in Section 6. Not
maximum allowable physical defects for each grade. It is
all of the visual quality categories are available in all grades.
applicable to commercially available natural muscovite mica
splittings regardless of the basic color of the mica or its source.
5. Physical Properties
1.2 The values stated in inch-pound units are to be regarded
5.1 Natural muscovite mica splittings shall meet the size
as the standard. The values given in parentheses are for
requirementsspecifiedinTable1.ClassificationD 351,Table1
information only.
and Fig. 1 , define more completely the areas and minimum
1.3 This standard is very similar to ISO 6386. It is expected
dimensions that define the size grades, and which should be
that materials would be classified identically using the criteria
used in conjunction with Table 1 of this specification.
of either standard. The grades shown under “ASTM Grade
5.2 There shall not be more than the maximum allowable
No.” in Table 1 and Table 2 are shown under “Old Grade No.”
total defects specified in Table 2 based on percentage weight.
in ISO 6386.
Such defects shall not lie predominantly in any one category.
2. Referenced Documents 5.3 There shall not be more of any single defect than the
percentages specified where a specific percentage is allowed
2.1 ASTM Standards:
for such defect.
D 351 Classification for Natural Muscovite Block Mica and
5.4 There shall not be any foreign matter included among
Thins Based on Visual Quality
the splittings.
D 1711 Terminology Relating to Electrical Insulation
2.2 ISO Publications:
6. Visual Quality
ISO 6386-1981 Muscovite Mica Splittings—Grading and
3 6.1 Where specified, the visual quality shall conform to the
Visual Classification
description of the visual category specified, as given in
3. Terminology Classification D 351:
6.1.1 V-1—Clear,
3.1 For definitions relating to mica and for terms applicable
6.1.2 V-2—Clear and Slightly Stained,
to this standard, refer to Terminology D 1711, and Classifica-
6.1.3 V-3—Fair Stained,
tion D 351.
6.1.4 V-4—Good Stained,
4. Classification
6.1.5 V-5—Stained A Quality,
6.1.6 V-5.1—Stained Quality,
4.1 Mica splittings are classified by size, form, and visual
6.1.7 V-6—Stained B Quality,
quality and properties.
6.1.8 V-7—Heavy Stained,
6.1.9 V-8—Densely Stained,
This specification is under the jurisdiction of ASTM Committee D09 on
6.1.10 V-9—Black Dotted,
Electrical and Electronic Insulating Materials and is the direct responsibility of
6.1.11 V-10—Black Spotted,
Subcommittee D09.19 on Dielectric Sheet and Roll Products.
6.1.12 V-11—Black Stained, and
Current edition approved March 10, 2003. Published April 2003. Originally
approved in 1962. Last previous edition approved in 1997 as D 2131 – 97.
6.1.13 V-12—Black/Red Stained
Annual Book of ASTM Standards, Vol 10.01.
6.2 Refer to Classification D 351 for a complete description
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
of the visual quality categories.
4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 2131 – 97 (2003)
TABLE 1 Requirements for Size and Average Thickness of Splittings
NOTE 1—Splittings shall not be of the minimum area specified, but shall contain a fair proportion of sizes throughout the range specified.
NOTE 2—The areas specified do not refer to the total area of the splittings but to the usable rectangular size that each grade will produce. For example,
1 1
Grade 5 splittings should be large enough to provide rectangular pieces measuring 1 ⁄2by2,3by2,2by2 ⁄3 in., etc.
Minimum
Dimension of Us- Thickness of 10
2A
ASTM Grade Form Size, in.
B
able Splittings, in.
B
Rectangle, in.
C
4 Bookform 6 to 10, excl 1 ⁄2(38) 0.006 to0.009,incl
C
5 Bookform 3 to 6, excl 1 (25) 0.006 to0.009,incl
1 D 7 C
5 ⁄2 Bookform 2 to 3, excl ⁄8(22) 0.006 to0.009,incl
C
6 Bookform 1 to 2, excl ⁄4(19) 0.0006to0.010,incl
4 Loose with powder 6 to 10, excl 1 ⁄2(38) 0.006 to0.009, incl
5 Loose with powder 3 to 6, excl 1 (25) 0.006 to0.009, incl
1 1 7
5 ⁄2
...
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