ASTM D2131-97

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.

General Information

• Status: Historical
• Publication Date: 09-Sep-1997
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Relations

• Replaced By: ASTM D2131-97(2003) - Standard Specification for Natural Muscovite Mica Splittings
• Effective Date: 10-Mar-2003

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: D 2131 – 97
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 4.3 Within the grades, up to thirteen categories of visual
quality may be separately specified, as listed in Section 6. Not
1.1 This specification covers the determination of muscovite
all of the visual quality categories are available in all grades.
mica splittings of standard commercial grades and specifies the
maximum allowable physical defects for each grade. It is
5. Physical Properties
applicable to commercially available natural muscovite mica
5.1 Natural muscovite mica splittings shall meet the size
splittings regardless of the basic color of the mica or its source.
requirements specified in Table 1. Classification D 351, Table 1
1.2 The values stated in inch-pound units are to be regarded
and Fig. 1 , define more completely the areas and minimum
as the standard. The values given in parentheses are for
dimensions that define the size grades, and which should be
information only.
used in conjunction with Table 1 of this specification.
1.3 This standard is very similar to ISO 6386. It is expected
5.2 There shall not be more than the maximum allowable
that materials would be classified identically using the criteria
total defects specified in Table 2 based on percentage weight.
of either standard. The grades shown under “ASTM Grade
Such defects shall not lie predominantly in any one category.
No.” in Table 1 and Table 2 are shown under “Old Grade No.”
5.3 There shall not be more of any single defect than the
in ISO 6386.
percentages specified where a specific percentage is allowed
2. Referenced Documents for such defect.
5.4 There shall not be any foreign matter included among
2.1 ASTM Standards:
the splittings.
D 351 Classification for Natural Muscovite Block Mica and
Thins Based on Visual Quality
6. Visual Quality
D 1711 Terminology Relating to Electrical Insulation
6.1 Where specified, the visual quality shall conform to the
2.2 ISO Publications:
description of the visual category specified, as given in
ISO 6386-1981 Muscovite Mica Splittings—Grading and
3 Classification D 351:
Visual Classification
6.1.1 V-1—Clear,
3. Terminology 6.1.2 V-2—Clear and Slightly Stained,
6.1.3 V-3—Fair Stained,
3.1 For definitions relating to mica and for terms applicable
6.1.4 V-4—Good Stained,
to this standard, refer to Terminology D 1711, and Classifica-
6.1.5 V-5—Stained A Quality,
tion D 351.
6.1.6 V-5.1—Stained Quality,
4. Classification 6.1.7 V-6—Stained B Quality,
6.1.8 V-7—Heavy Stained,
4.1 Mica splittings are classified by size, form, and visual
6.1.9 V-8—Densely Stained,
quality and properties.
6.1.10 V-9—Black Dotted,
4.2 Thirteen grades, based on size and form, are described
6.1.11 V-10—Black Spotted,
as given in Table 1.
6.1.12 V-11—Black Stained, and
6.1.13 V-12—Black/Red Stained
This specification is under the jurisdiction of ASTM Committee D-9 on
6.2 Refer to Classification D 351 for a complete description
Electrical and Electronic Insulating Materials and is the direct responsibility of
of the visual quality categories.
Subcommittee D09.19 on Dielectric Sheet and Roll Products.
Current edition approved Sept. 10, 1997. Published January 1998. Originally
e1
published as D 2131 –1962 T. Last previous edition D 2131 – 90a (1994) .
Annual Book of ASTM Standards, Vol 10.01.
Available from American National Standards Institute, 11 West 42nd St., New
York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D2131–97
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 ⁄2 by 2,3by2,2by2 ⁄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
D C
1 7
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 Loose with powd
...