1、BRITISH STANDARD BS 2782-6: Method630A: 1994 ISO 4593:1993 Methods of testing Plastics Part 6:Dimensional properties Method 630A: Determination of thickness by mechanical scanning of flexible sheet UDC 678.5/.8-416:678.01:543.71BS2782-6:Method630A:1994 This British Standard, having been prepared und
2、er the directionof the Plastics and Rubber Standards Policy Committee, was published underthe authority of the Standards Board and comes into effect on 15February1994 BSI 03-1999 First published January1982 Second edition February1994 The following BSI references relate to the work on this standard:
3、 Committee reference PRM/75 Draft for comment 92/43575DC ISBN 0 580 22951 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/75, upon which the following bo
4、dies were represented: British Plastics Federation Her Majestys Stationery Office Institute of Trading Standards Administration Ministry of Defence Packaging and Industrial Films Association PIRA International Amendments issued since publication Amd. No. Date CommentsBS2782-6:Method 630A:1994 BSI 03
5、-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Apparatus 1 3 Test specimens 1 4 Procedure 1 5 Precision 1 6 Test report 1 List of references Inside back coverBS2782-6:Method 630A:1994 ii BSI 03-1999 National foreword This British Standard has been pr
6、epared under the direction of the Plastics and Rubber Standards Policy Committee. It is identical with ISO4593:1993 Plastics Film and sheeting Determination of thickness by mechanical scanning, published by the International Organization for Standardization (ISO). This standard supersedes BS2782:Met
7、hod630A:1982which is withdrawn. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-ref
8、erence International standard Corresponding British Standard ISO 4591:1992 BS 2782 Methods of testing plastics Method631A:1993 Determination of gravimetric thickness and yield of flexible sheet (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii,
9、 pages1and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.ISO4593:1993(E) BSI 03-1999 1 1 Scope This International Standard specifies a meth
10、od for the determination of the thickness of a sample of plastics film or sheeting by mechanical scanning. The method is not suitable for use with embossed film or sheeting. 2 Apparatus 2.1 Thickness-measuring device, capable of measuring to the following accuracies: up to and including1004m to an a
11、ccuracy of14m (see note1); above 1004m and up to and including 2504m to an accuracy of 24m; above 2504m to an accuracy of 34m. NOTE 1Where the above is not adequate and a higher accuracy is required, this method should not be applied but a more suitable measuring device or method selected. The deter
12、mination of gravimetric thickness is described in ISO4591:1992, Plastics Film and sheeting Determination of average thickness of a sample, and average thickness and yield of a roll, by gravimetric techniques (gravimetric thickness) The measuring surfaces of the device shall comprise a plane lower fa
13、ce and either a plane or radiused upper face. All surfaces shall be polished. 2.1.1 In the case of plane/plane measuring surfaces, the diameter of each face shall be between2,5mm and10mm and they shall be parallel to within54m. The lower face shall be capable of being adjusted to conform to this req
14、uirement. The force applied to the measuring face shall be0,5N to1,0N. 2.1.2 In the case of plane/radiused measuring surfaces, the diameter of the plane lower surface shall not be less than5mm and the radius of curvature of the upper surface shall be15mm to50mm. The force applied to the radiused fac
15、e shall be0,1N to0,5N. NOTE 2Transmission of the measured values may be performed, for example, mechanically (by micrometer), optically (by mirror instrument) or electronically (inductively). 3 Test specimens Cut test specimens, about 100 mm wide, across the whole width of the sample. When required,
16、 take specimens at positions approximately1m apart in the longitudinal direction of the sample. The specimens shall contain no creases except those necessary for folding the film for presentation or packaging purposes. The specimens shall contain no other defects. 4 Procedure 4.1 Condition the speci
17、mens for at least1h at23 C 2 C. For moisture-sensitive films, the conditioning time and atmosphere shall be as stated in the specification for the material under test or as specified between buyer and seller. 4.2 Ensure that the specimens and the faces of the measuring device (2.1) are free from con
18、tamination, for example dust. 4.3 Check the zero point of the measuring device before starting the measurements and recheck after each series of measurements. 4.4 When determining the thickness, lower the foot gently to avoid deforming the material. 4.5 Determine the thickness of the specimens at po
19、ints equally spaced along the length of the specimen, as follows: a) for samples less than300mm wide 10points; b) between300mm wide and1500mm wide 20 points; c) more than 1500mm wide minimum30points. Measurements shall not be taken within50mm of the edges of untrimmed rolls. 5 Precision The precisio
20、n of this test method is not known because interlaboratory data are not available. When interlaboratory data are obtained, a precision statement will be added at the following revision. 6 Test report The test report shall include the following: a) a reference to this International Standard; b) all d
21、etails necessary for identification of the sample; c) the types of measuring face used and the force applied; d) the length of the specimens; e) the number of specimens measured; f) the arithmetic mean of the individual measurements, to the nearest14m or0,001mm, reported as the average mechanically
22、measured thickness of the specimens; if required, the individual readings shall also be reported; g) the total number of measurements made and, if required, the standard deviation.2 blankBS2782-6:Method 630A:1994 BSI 03-1999 List of references See national foreword.BSI 389 Chiswick High Road London
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