ASTM D2131-97(2016)

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. (A) 1 in.2 = 6.45 cm2 .(B) 1 in. = 25.4 mm (exact).(C) Minimum and maximum thickness of a single splitting in the case of bookform splittings shall be agreed upon between the purchaser and the seller.(D) Upon agreement between the buyer and the seller, the minimum area may be 11/2 in.2 (9.7 cm 2).  (A) Not to be included with total allowable defects.(B) Lots that contain more than 2 % of stained splittings in which the sum of the major dimensions of the stains exceed 1/4 in. (6.4 mm) shall not be regarded as meeting these standards. No mineral stain shall be permitted in Bookform Splittings. No more than 30 % of the stain in Nos. 4, 5, and 51/2 Loose with Powder shall be mineral stain. No more than 40 % of the stain in Nos. 6 Loose with Powder, 6-1st, 6-2nd, and 6-3rd Loose, shall be mineral stain.(C) To include an evaluation of undersize splittings for other defects.(D) Examine for the defect listed.(E) No hole shall be permitted.(F) Count as a defect if more than 20 % of the periphery is rough or burred.(G) Same as FootnoteF except 35 %.(H) Do not examine for the defect listed.(I) Determine undersize in accordance with Table 1.

General Information

• Status: Historical
• Publication Date: 14-May-2016
• ICS: 73.080 - Non-metalliferous minerals
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.01 - Electrical Insulating Products

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
Designation:D2131 −97 (Reapproved 2016)
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 D09.01 on Electrical Insulating Products.
6.1.9 V-8—Densely Stained,
Current edition approved May 15, 2016. Published May 2016. Originally
ε1 6.1.10 V-9—Black Dotted,
approved in 1962. Last previous edition approved in 2008 as D2131 – 97 (2008) .
DOI: 10.1520/D2131-97R16.
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
D2131−97 (2016)
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) 0.00
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: D2131 − 97 (Reapproved 2008) D2131 − 97 (Reapproved 2016)
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
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.
2. Referenced Documents
2.1 ASTM Standards:
D351 Classification for Natural Muscovite Block Mica and Thins Based on Visual Quality
D1711 Terminology Relating to Electrical Insulation
2.2 ISO Publications:
ISO 6386-1981 Muscovite Mica Splittings—Grading and Visual Classification
3. Terminology
3.1 For definitions relating to mica and for terms applicable to this standard, refer to Terminology D1711, and Classification
D351.
4. Classification
4.1 Mica splittings are classified by size, form, and visual quality and properties.
4.2 Thirteen grades, based on size and form, are described as given in Table 1.
4.3 Within the grades, up to thirteen categories of visual quality may be separately specified, as listed in Section 6. Not all of
the visual quality categories are available in all grades.
5. Physical Properties
5.1 Natural muscovite mica splittings shall meet the size requirements specified in Table 1. Classification D351, Table 1 and
Fig. 1 , define more completely the areas and minimum dimensions that define the size grades, and which should be used in
conjunction with Table 1 of this specification.
5.2 There shall not be more than the maximum allowable total defects specified in Table 2 based on percentage weight. Such
defects shall not lie predominantly in any one category.
5.3 There shall not be more of any single defect than the percentages specified where a specific percentage is allowed for such
defect.
This specification is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.19 on Dielectric Sheet and Roll Products (Disbanded 4/2016).
Current edition approved May 1, 2008May 15, 2016. Published July 2008May 2016. Originally approved in 1962. Last previous edition approved in 20032008 as
ε1
D2131 – 97 (2008) (2003). DOI: 10.1520/D2131-97R08E01.10.1520/D2131-97R16.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D2131 − 97 (2016)
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, 3 by 2, 2 by 2 ⁄3 in., etc.
Minimum
Dimension of Us- Thickness of 10
2A
ASTM Grade Form Size, in.
B
able Splittings, in.
B
Rectangle, in.
1 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 powder 1 ⁄2 to 3, excl ⁄8 (22) 0.007 to0.010, incl
1 3
6 Loose with powder 1 to 1 ⁄2, excl ⁄4 (19) 0.007 to0.010, incl
6-1st Loose At least 70 % shall be 1 to 1 ⁄2, excl 0.007 to0.010, incl
Not more than 3 % shall pass through a screen hav-
ing ⁄4-in. square openings.
6 Intermediate Loose At least 60 % shall be 1 to 1 ⁄2, excl 0.007 to0.010, incl
At least 25 % shall be ⁄4 to 1
Not more than 3 % shall pass through a screen hav-
ing ⁄8-in. square openings.
6-2nd Lo
...