1、BRITISH STANDARD BS EN ISO 1923:1995 Cellular plastics and rubbers Determination of linear dimensions The European Standard EN ISO 1923:1995 has the status of a British StandardBSENISO1923:1995 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chem
2、icals, was published under the authority of the Standards Board and comes intoeffect on 15 July 1995 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PRI/24 Draft for comment 94/300609 DC ISBN 0 580 23783 4 Committees responsible for this British Stan
3、dard The preparation of this British Standard was entrusted to Technical Committee PRI/24, Test methods for cellular plastics and rubbers, upon which the following bodies were represented: British Plastics Federation British Railways Board British Rigid Urethane Foam Manufacturers Association Britis
4、h Rubber Manufacturers Association Ltd. Department of the Environment (Building Research Establishment) Furniture Industry Research Association Furniture, Timber and Allied Trades Union Ministry of Defence National Bed Federation Limited Phenolic Foam Manufacturers Association RAPRA Technology Ltd.
5、Society of British Aerospace Companies Limited Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No. Date CommentsBSENISO1923:1995 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope and field of appl
6、ication 3 2 Definition 3 3 Measuring equipment 3 4 Procedure 3 5 Report 4 Annex Example of apparatus conforming to the applications in3.1 Inside back coverBSENISO1923:1995 ii BSI 07-1999 National foreword This British Standard has been prepared by Technical Committee PRI/24, and is the English langu
7、age version of EN ISO 1923:1995 Cellular plastics and rubbers Determination of linear dimensions published by the European Committee for Standardization (CEN) which is identical with ISO 1923:1981, published by the International Organization for Standardization (ISO). This British Standard supersede
8、s method 1 of BS 4730-1:1988 and method 1 of BS 4443-1:1988, which are deleted by amendment. 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 no
9、t of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, pages 2 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendment
10、s incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1923 May 1995 ICS 83.100 Descriptors: Cellular materials, dimensional measurement English version Cellular plastics and rubbers Determination of linear dime
11、nsions (ISO 1923:1981) Plastiques et caoutchoucs alvolaires Dtermination des dimensions linaires (ISO 1923:1981) Schaumstoffe und Schaumgummis Bestimmung der linearen Abmessungen (ISO 1923:1981) This European Standard was approved by CEN on 1995-05-11. CEN members are bound to comply with the CEN/CE
12、NELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any
13、 CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CE
14、N members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Eur
15、opisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved to CEN members Ref. No. EN ISO 1923:1995 EENISO1923:1995 2 BSI 07-1999 Foreword The text of the international standard from ISO/TC61, Plastics, of the International Organization for Standardi
16、zation (ISO) has been taken over as a European Standard by the Technical Committee CEN/TC 249, Plastics. The European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November1995, and conflicting national stand
17、ards shall be withdrawn at the latest by November1995. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway
18、, Portugal, Spain, Sweden, Switzerland, United Kingdom. This European Standard should not be used for cellular plastics and rubber materials for use as thermal insulation in building applications. Determination of dimensions of these products is covered by EN822 Thermal insulating products for build
19、ing applications Determination of length and width, and by EN823 Thermal insulating products for building applications Determination of thickness.ENISO1923:1995 BSI 07-1999 3 1 Scope and field of application This International Standard specifies the characteristics and the choice of the measuring eq
20、uipment and procedure for determination of the linear dimensions of sheets, blocks or test specimens of cellular material (flexible and rigid). 2 Definition For the purposes of this International Standard the following definition applies: linear dimension the shortest distance, measured with an inst
21、rument according to clause3, between two specific points, between two parallel lines or between two parallel planes, defined by corners, edges or surfaces of the cellular specimen 3 Measuring equipment 3.1 Dial gauge with a measuring surface of about10 cm 2 . The gauging pressure shall be100 10 Pa 1
22、)and the reading accuracy shall be0,05mm. 3.2 Micrometer, having a measuring surface with a minimum diameter of5mm, but in any case not less than five times the average diameter of the cells, permitting reading with an accuracy of0,05mm. Use of a micrometer is restricted to rigid cellular materials,
23、 owing to the difficulty of determining the onset of compression of a flexible cellular material. 3.3 Sliding caliper, with a vernier permitting reading to an accuracy of0,1mm. 3.4 Metal rule or metal tape, graduated in millimetres and permitting reading to an accuracy of0,5mm. 4 Procedure 4.1 Choic
24、e of measuring equipment The choice of measuring equipment shall be in accordance with the accuracy corresponding to the dimensions to be measured (see the Table): a) When an instrument accuracy of0,05mm is required, a dial gauge (3.1) or micrometer (3.2) shall be used. The micrometer may be used on
25、ly for specimens of rigid cellular material with a shape not permitting the use of a dial gauge. An accuracy of 0,05 mm shall not normally be required for dimensions of more than 10 mm. b) When an instrument accuracy of 0,1 mm is required, a sliding caliper (3.3) shall be used. This accuracy of0,1mm
26、 shall not normally be required for dimensions of more than100mm. NOTEIn this case, a dial gauge or micrometer (rigid cellular material only) may also be used, but then the instrument accuracy need not be better than that of a sliding caliper. c) When an instrument accuracy of0,5mm is required, a me
27、tal rule or metal tape (3.4) shall be used. NOTEIn this case, a sliding caliper may also be used, but then the instrument accuracy need not be better than that of a metal rule or metal tape. Table Choice of measuring equipment 4.2 Number and location of the measurements The number of the measuring l
28、ocations depends on the size and the shape of the specimen, but shall be at least five. The locations shall be as widely separated as possible, in order to give a good average. The median of three readings at each position shall be taken and the average of the five or more median values calculated.
29、4.3 Measurement with dial gauge (3.1) The measurement shall normally be made on a base plate. The base plate shall be larger than the largest dimension of the specimen that is supported by the base plate. The specimen shall rest flat upon the base plate during the measurements. The readings of the d
30、ial gauge shall be rounded off to the nearest0,1mm. 1) Commercial dial gauges that incorporate a spring pressure may not satisfy this condition. An example of one design of an appropriate apparatus is given in the Annex. Values in millimetres Range of dimensions Required accuracy Instrument recommen
31、ded Median of readings rounded off to the nearest millimetre For normal use If the shape of the specimen permits u 10 0,05 Dial gauge or micrometer 0,1 10 to u 100 0,1 Sliding caliper Micrometer (rigid only) or dial gauge 0,2 100 0,5 Metal rule or metal tape Sliding caliper 1ENISO1923:1995 4 BSI 07-
32、1999 4.4 Measurement with micrometer (3.2) (rigid cellular material only) For the measurement, the plane surfaces of the micrometer shall be continuously brought together until they just touch the cellular material, without causing any distortion or damage of the surface of the specimen. The specime
33、n shall be moved slightly back and forward. Simultaneously the plane surfaces of the micrometer shall be slowly brought together until a slight resistance to the movement is felt. NOTEThe area of the measuring surface may be increased by measuring over metal sheet or plate. The readings of the micro
34、meter shall be rounded off to the nearest 0,1mm. 4.5 Measurement with sliding caliper (3.3) The readings of the sliding caliper shall be rounded off to the nearest0,2mm. 4.5.1 All materials The caliper shall be progressively preset to smaller measurements and presented to the specimen until the sett
35、ing is reached when the caliper measuring faces just touch the surfaces of the specimen without any compression or damage to the latter. 4.5.2 Rigid cellular material only The method specified in4.4 may be used. 4.6 Measurement with metal rule or metal tape(3.4) The cellular material shall not be di
36、storted or damaged by the application of the metal rule or metal tape. The metal rule or metal tape measurements shall be rounded off to the nearest1mm. 5 Report The report shall include the following particulars: a) reference to this International Standard; b) type and designation of the cellular m
37、aterial; c) measuring equipment used; d) dimensions in millimetres, rounded off to0,1mm for measurements made with dial gauge or micrometer, rounded off to0,2mm for measurements with sliding caliper, and rounded off to1mm for measurements with metal rule or metal tape; e) any deviations from the spe
38、cified test procedure.ENISO1923:1995 BSI 07-1999 Annex Example of apparatus conforming to the specifications in3.1 The apparatus consists of the following parts: a) base plate, with adjustable support to accommodate the dimension to be measured; b) screw micrometer, reading0,05mm or better; c) alumi
39、nium plate of area10cm 2 , to be placed on the test specimen and connected to an electric circuit, consisting of flexible wire, a battery and a lamp; the mass of the plate should be such that a pressure of100 10Pa is exerted on the test specimen; d) calibrated spacer gauge blocks, with a tolerance o
40、f0,01mm, selected according to the dimension to be measured. The reading should be taken at the moment the lamp glows.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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