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1、BRITISH STANDARD BS 3564:1986 ISO 67:1981 Method for Size-grading of muscovite mica blocks, thins and films ISO title: Muscovite mica blocks, thins and films Grading by size UDC 621.315.613.1 + 679.867.7:622.741 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:36:07 GMT+00:00 2006, Uncontro
2、lled Copy, (c) BSI BS 3564:1986 This British Standard, having been prepared under the direction of the General Electrotechnical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 January 1986 BSI 12-1999 First published November 1962 Fi
3、rst revision January 1986 The following BSI references relate to the work on this standard: Committee reference GEL/16 Draft for comment 84/28849 DC ISBN 0 580 14939 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Eletrotechnic
4、al Engineering Standards Committee (GEL/-) to Technical Committee GEL/16, upon which the following bodies were represented: Adhesive Tape Manufacturers Association British Industrial Ceramic Manufacturers Association British Paper and Board Industry Federation (PIF) British Plastics Federation Briti
5、sh Telecommunications plc Department of Trade and Industry (British Calibration Service) ERA Technology Ltd. Electrical and Electronic Insulation Association (BEAMA Ltd.) Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electricity Supply Industry in England and Wales Electro
6、nic Engineering Association Ministry of Defence Rotating Electrical Machines Association (BEAMA Ltd.) Rubber and Plastics Research Association of Great Britain Telecommunication Engineering and Manufacturing Association (TEMA) Transmission and Distribution Association (BEAMA Ltd.) The following body
7、 was also represented in the drafting of the standard: Mica Trade Club Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:36:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3564:1986 BSI 12-1999i Contents Page Committees respo
8、nsibleInside front cover National forewordii 0Introduction1 1Scope and field of application1 2References1 3Definitions1 4Grading method2 5Trimming3 6Grading procedure4 7Tolerance4 Figure Grading chart for muscovite mica blocks, thins and films5 Table 1 Standard grading for muscovite mica blocks, thi
9、ns and films3 Table 2 Additional grades for thumb-trimmed mica4 Table 3 Additional grades for Madras rounds4 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:36:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3564:1986 ii BSI 12-1999 National forew
10、ord This revision of BS 3564 has been prepared under the direction of the General Eletrotechnical Engineering Standards Committee and supersedes BS 3564:1962 which is withdrawn. It is identical with ISO 67:1981 “Muscovite mica blocks, thins and films Grading by size” published by the International O
11、rganization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention
12、 is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British S
13、tandard”. Where expressions such as “agreed between the interested parties” and “subject to agreement.” appear, e.g. in 3.12 and 5.3, this should be taken to indicate that the subject matter concerned is not inherently part of the requirements of the standard, but should be included in the purchase
14、contract. The Technical Committee has reviewed the provisions of ISO 444 to which reference is made in the text and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of Brit
15、ish Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardaCorresponding British Standard ISO 3:1973BS 2045:1965 Preferred numbers (Technically equivalent) ISO 2185
16、:1972BS 5804:1979 Method of visual classification for muscovite mica blocks, thins and films (Identical) a Undated in the text. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been u
17、pdated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:36:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3564:1986 BSI 12-19991 0 Introduction Muscovite
18、 mica constitutes one of the two principal types of mica, the other being phlogopite mica the grading of which is dealt with by ISO 444. For the corresponding complementary classification of muscovite mica according to visual quality, reference should be made to ISO 2185. 1 Scope and field of applic
19、ation This International Standard specifies a standard method for grading muscovite mica blocks, thins and films according to size. It also specifies trimming requirements and defines relevant terms used in the trade. 2 References ISO 444, Phlogopite mica blocks, thins and splittings Grading by size
20、. ISO 2185, Muscovite mica blocks, thins and films Visual classification. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 crude mica crude crystals or books, as extracted from the mine 3.2 cobbing the process of removing dirt and rock from crude mi
21、ca 3.3 rifting the process of splitting cobbed mica into sheets of suitable thicknesses 3.4 trimming; dressing the process of removing major flaws from rifted mica. Trimming may be accomplished with fingers, sickle or knife. Mica is then named after the implement used, sickle-trimmed mica, thumb-tri
22、mmed mica 3.5 sickle-trimmed mica crude mica cobbed, rifted and trimmed with a sickle to eliminate major flaws and left with an irregular outline and bevelled edges 3.6 knife-trimmed mica sickle-trimmed mica, further refined with a knife to eliminate interior defects and also such defects as may hav
23、e been overlooked by the sickle-cutter 3.7 thumb-trimmed mica rifted mica, trimmed with thumb and other fingers 3.8 full-trimmed mica rifted mica, trimmed on all sides, eliminating all cracks, reeves and cross-grains 3.9 half-trimmed mica rifted mica trimmed on two sides, with at least two-thirds of
24、 the pieces trimmed on two adjacent sides, and the balance of the pieces trimmed on the two parallel long sides, with no cracks extending into the area by which the piece is graded. The foregoing does not apply to sizes 06 and 16 (grades 6 and 5“), for which at least one of the two trimmed sides mus
25、t be free of cracks, and no cracks may extend into the area by which the piece is graded. It shall be possible to cut from the mica rectangles of accepted size and quality with a mass loss not exceeding 60 % based on the total inspection sample 3.10 madras rounds madras mica, cut with shears into ov
26、al or circular shapes 3.11 commercial forms of mica mica known as blocks, thins, films and splittings 3.12 blocks knife-trimmed mica of a specified minimum thickness which may be, with a maximum tolerance of 5 % (m/m), either 0,20 mm with a tolerance limit at 0,18 mm, or 0,18 mm with a tolerance lim
27、it at 0,15 mm, as agreed between the interested parties 3.13 thins knife-trimmed mica in any specified thickness between 0,05 mm and 0,18 mm 3.14 films knife-trimmed mica split to any specified range of thicknesses Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:36:07 GMT+00:00 2006, Uncon
28、trolled Copy, (c) BSI BS 3564:1986 2 BSI 12-1999 3.15 splittings1) laminae split from blocks and thins, the thickness of ten of which taken together does not exceed 0,28 mm 3.16 scrap mica by-product obtained in the course of producing graded mica 3.17 “A” series of rulings or striations intersectin
29、g at an angle of about 60 3.18 cracks irregular visible fractures within a crystal that may be natural or may arise from blasting, rough handling, etc 3.19 cross-grains; jatahi; reeves tangled laminations giving imperfect cleavage which results in tears or breaks during splitting 3.20 haircracks; ha
30、irline cracks minute irregular cracks that are barely noticeable until mica is split into films, resulting in torn films 3.21 herring-bones numerous rulings that intersect to form a series of “Vs”, the legs making angles of about 120 and meeting at the apex to produce a herring-bone, horse-tail or f
31、eather structure 3.22 hole a perforation, sometimes minute, through the laminae 3.23 ribboned mica; ruled mica mica which breaks into strips because of parallel fractures 3.24 ribs; ridges crenellations in the form of steps 3.25 tangle sheel a piece of mica that splits well in some places but tears
32、in others, producing a large percentage of partial films. Sometimes the term is applied to the intergrowth of mica crystals 3.26 “V” cuts; figure cuts edge cuts converging towards the central area of the mica piece 3.27 wedge a piece of mica which, on splitting, yields pieces thicker at one end than
33、 at the other 4 Grading method 4.1 Principle The standard grading method for all-trimmed muscovite mica in based on the maximum usable rectangle (usable area) that may be cut from the specimen, and not on its total area. For half-trimmed muscovite mica, see 3.9. Madras rounds and certain variations
34、of thumb-trimmed mica shall be graded on the basis of the usable circle. 4.2 Grade designations The grade designations for muscovite mica blocks, thins and films and the corresponding areas of the usable rectangles, with minimum dimensions of the shorter side, are given in Table 1 and shown in the F
35、igure. Each grade of mica in a consignment shall contain a natural distribution of sizes from the minimum to the maximum area specified for the grade. 4.3 Sequence of operations All specimens to be graded shall be trimmed prior to grading. The trimmed samples shall be graded according to the procedu
36、re laid down in clause 6. In addition to size-grading, all muscovite blocks, thins and films shall fulfil, with respect to the usable rectangle, the requirements of the desired visual quality, as specified in ISO 2185. 1) For further information concerning splittings, see ISO 444. Licensed Copy: she
37、ffieldun sheffieldun, na, Wed Nov 29 07:36:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3564:1986 BSI 12-19993 5 Trimming 5.1 Full-trimmed mica 5.1.1 Requirements Full-trimmed muscovite mica blocks, thins and films shall be trimmed to remove all cracks, reeves, cross-grains, etc., so as to compl
38、y with the specifications for the desired visual quality. Trimming shall follow the natural contour of the mica. As far as possible, all marginal cracks should be removed by recutting. 5.1.2 Usable rectangle The total area of each piece of full-trimmed mica for sizes 40 (grade 4) and above shall not
39、 exceed 1,54 times the area of the largest usable rectangle; in other words, the total area shall have a rectangular yield of at least 65 %, with the tolerance that no more than 5 % (m/m) of blocks, by mass, may have a yield less than 65 %. For full-trimmed mica up to size 20 (grade 5), the total ar
40、ea of each piece shall not exceed twice the area of the largest usable rectangle; in other words, the total area shall have a rectangular yield of at least 50 %, with the tolerance that no more than 5 % (m/m) of blocks, by mass, may have a yield of less than 50 %. 5.2 Half-trimmed mica 5.2.1 Require
41、ments Half-trimmed muscovite mica blocks, thins and films shall be trimmed on two sides. At least two-thirds of the pieces shall be trimmed on two adjacent sides, while the balance shall be trimmed on the two parallel long sides, with no cracks extending into the usable rectangle (area by which the
42、piece is graded). For sizes 06 and 16 (grades 6 and 5“), at least one of the two trimmed sides shall be free of cracks, and no cracks may extend into the usable rectangle. 5.2.2 Usable rectangle For half-trimmed blocks or thins, the usable rectangle is the total area within the rectangle of acceptab
43、le size and quality, which shall be not less than 40 % of the total area, based on the total inspection sample; that is, its cutting shall not involve a mass loss exceeding 60 % of the mass of the total inspection sample. 5.3 “V” cuts If limitation as to the size, number and frequency of “V” cuts is
44、 desired, it shall be subject to agreement between the interested parties. If mica without any “V” cut is demanded by the buyer, it shall be supplied by the seller subject to mutual agreement. Table 1 Standard grading for muscovite mica blocks, thins and films Grade designation Area of usable rectan
45、gle Minimum dimension of shorter side of usable rectangle Permissible tolerance for a lot in a consignment newaoldcm2 (Size)(Grade or number)from (incl.)to (excl.)cm 630OOEE Special645,2 and above10,2Nil 500 400 315 250 160 100 63 40 20 16 06 05 OEE Special EE Special E Special Special 1 2 3 4 5 5“
46、6 7 516,1 387,1 309,7 232,3 154,8 96,8 64,5 38,7 19,4 14,5 6,4 4,8 645,2 516,1 387,1 309,7 232,3 154,8 96,8 64,5 38,7 19,4 14,5 6,4 10,2 10,2 10,2 8,9 7,6 5,1 5,1 3,8 2,5 2,2 1,9 1,6 Nil Nil Nil Nil 5 % of pieces having width down to and including 5,1 cm 5 % of pieces having width down to and includ
47、ing 3,8 cm 5 % of pieces having width down to and including 3,8 cm 5 % of pieces having width down to and including 2,5 cm Nil Nil Nil Nil a These designations are based on the R 20 series of preferred numbers, in accordance with ISO 3, Preferred numbers Series of preferred numbers. Licensed Copy: s
48、heffieldun sheffieldun, na, Wed Nov 29 07:36:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3564:1986 4 BSI 12-1999 5.4 Finishing Muscovite mica blocks shall be finished with sickle- or knife-cut bevelled edges. 6 Grading procedure 6.1 Grading chart The range of the areas and the minimum dimension
49、s of the shorter side of the usable rectangle for the various grades, given in Table 1, applies for the grading of all muscovite mica blocks, thins and films. A grading chart, based on this table and shown in the Figure, or templates prepared in accordance with it, shall be used for grading in accordance with the procedure specified in 6.2. 6.1.1 Thumb-trimmed mica This may also be graded according to the additional grades, based on the usable circle, given in Table 2. Table 2 Additional grades for thumb-trimmed mica 6.1.2 Madras rounds These shall