ASTM D2131-97(2008)e1

Standard Classification for Natural Muscovite Mica Splittings

ABSTRACT
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. This specification covers thirteen grades of mica splittings based on size and form classification. Mica splittings shall meet the specified physical property requirements such as size, thickness, defects, and absence of any foreign matter. Where specified, the visual quality shall conform to the description of the visual category specified such as V-1, V-2, V-3, V-4, V-5, V-5.1, V-6, V-7, V-8, V-9, V-10, V-11, and V-12. The method of sampling of mica splittings in bookform and loose with powder form are specified and method of calculation of defect percentage is given.
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 6386-1981.

General Information

• Status: Historical
• Publication Date: 30-Apr-2008
• ICS: 73.080 - Non-metalliferous minerals
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Relations

• Replaces: ASTM D2131-97(2003) - Standard Specification for Natural Muscovite Mica Splittings
• Effective Date: 01-May-2008

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
´1
Designation:D2131 −97(Reapproved 2008)
Standard Classification for
Natural Muscovite Mica Splittings
This standard is issued under the fixed designation D2131; 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 4.2 Thirteen grades, based on size and form, are described
as given in Table 1.
1.1 Thisspecificationcoversthedeterminationofmuscovite
mica splittings of standard commercial grades and specifies the
4.3 Within the grades, up to thirteen categories of visual
maximum allowable physical defects for each grade. It is
quality may be separately specified, as listed in Section 6. Not
applicable to commercially available natural muscovite mica
all of the visual quality categories are available in all grades.
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
as the standard. The values given in parentheses are for
5.1 Natural muscovite mica splittings shall meet the size
information only.
requirements specified in Table 1. Classification D351, Table 1
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
No.” in Table 1 and Table 2 are shown under “Old Grade No.”
5.2 There shall not be more than the maximum allowable
in ISO 6386-1981.
total defects specified in Table 2 based on percentage weight.
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
2.1 ASTM Standards:
percentages specified where a specific percentage is allowed
D351 Classification for Natural Muscovite Block Mica and
for such defect.
Thins Based on Visual Quality
D1711 Terminology Relating to Electrical Insulation
5.4 There shall not be any foreign matter included among
2.2 ISO Publications: the splittings.
ISO 6386-1981 Muscovite Mica Splittings—Grading and
Visual Classification
6. Visual Quality
6.1 Where specified, the visual quality shall conform to the
3. Terminology
description of the visual category specified, as given in
3.1 For definitions relating to mica and for terms applicable
Classification D351:
to this standard, refer to Terminology D1711, and Classifica-
6.1.1 V-1—Clear,
tion D351.
6.1.2 V-2—Clear and Slightly Stained,
4. Classification
6.1.3 V-3—Fair Stained,
6.1.4 V-4—Good Stained,
4.1 Mica splittings are classified by size, form, and visual
6.1.5 V-5—Stained A Quality,
quality and properties.
6.1.6 V-5.1—Stained D351 Quality,
6.1.7 V-6—Stained B Quality,
This specification is under the jurisdiction of ASTM Committee D09 on
6.1.8 V-7—Heavy Stained,
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.19 on Dielectric Sheet and Roll Products.
6.1.9 V-8—Densely Stained,
CurrenteditionapprovedMay1,2008.PublishedJuly2008.Originallyapproved
6.1.10 V-9—Black Dotted,
in 1962. Last previous edition approved in 2003 as D2131 – 97(2003). DOI:
10.1520/D2131-97R08E01.
6.1.11 V-10—Black Spotted,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1.12 V-11—Black Stained, and
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.1.13 V-12—Black/Red Stained
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
6.2 Refer to Classification D351 for a complete description
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org. of the visual quality categories.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
D2131−97 (2008)
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 to0.0
...