1、BRITISH STANDARDResilient floor coverings Determination of densityICS 97.150nullnull nullnullnullnullnullnullnull nullnullnullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnullnull nullnull nullnullnullnullnullnul
2、lnullnullnull nullnullnullBS EN ISO23996:2012National forewordThis British Standard is the UK implementation of EN ISO 23996:2012. It is identical to ISO 23996:2007. It supersedes BS ISO 23996:2007 and BS EN 436:1994, which are withdrawn.The UK participation in its preparation was entrusted to Techn
3、ical Committee PRI/60, Resilient floor coverings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance wit
4、h a British Standard cannot confer immunity from legal obligations.BS EN ISO 23996:2012This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2008 The British Standards Institution 2012. Published by BSI Standards Limited 2012.Amendments/co
5、rrigenda issued since publicationDate Comments 31 March 2012ISBN 978 0 580 75245 2This corrigendum renumbers BS ISO 23996:2007 as BS EN ISO 23996:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 23996 February 2012 ICS 97.150 Supersedes EN 436:1994English Version Resilient floor covering
6、s - Determination of density (ISO 23996:2007) Revtements de sol rsilients - Dtermination de la masse volumique (ISO 23996:2007) Elastische Bodenbelge - Bestimmung der Dichte (ISO 23996:2007) This European Standard was approved by CEN on 24 December 2011. CEN members are bound to comply with the CEN/
7、CENELEC 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 CEN-CENELEC Management Cent
8、re or to any 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 CEN-CENELEC Management Centre has the same status as the
9、 official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania
10、, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means rese
11、rved worldwide for CEN national Members. Ref. No. EN ISO 23996:2012: EForeword The text of ISO 23996:2007 has been prepared by Technical Committee ISO/TC 219 “Floor coverings” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 23996:2012 by Technical Commit
12、tee CEN/TC 134 “Resilient, textile and laminate floor coverings” the secretariat of which is held by BSI. This 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 August 2012, and conflicting national stan
13、dards shall be withdrawn at the latest by August 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 436
14、:1994. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
15、Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 23996:2007 has been approved by CEN as a EN ISO 23996:2012 without any modification.
16、 BS EN ISO 23996:2012 EN ISO 23996:2012 (E)2Resilient floor coverings Determination of density1 Scope This International Standard describes two methods for determining the density of homogeneous resilient floorcoverings and solid layersof other resilient floor coverings. 2 NormativereferencesThe fol
17、lowing referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.ISO 24342, Resilient and textile floor-coverings Determinat
18、ion of side length, edge straightness andsquareness of tilesISO 24346, Resilient floor coverings Determination of overall thickness3 Terms and definitions For the purposes of this document, the following terms and definitions apply.3.1 densityquotient of mass divided by volume4 Sampling Take three t
19、iles or a sample of at least 1 000 mm 1 000 mm for sheet material.5 Atmosphere for conditioning and testing Condition the samples at a temperature of (23 2) C and a relative humidity of (50 5) % for a minimum of 24 h. Maintain these conditions when conducting the test. 6 Method A6.1 Principle A test
20、piece of known mass is immersed in a liquid and reweighed, and its density is calculated. BS EN ISO 23996:2012 EN ISO 23996:2012 (E)36.2 Apparatus 6.2.1 Balance, with a sensitivity of 1 mg. 6.2.2 Pad straddle , or other stationary support. 6.2.3 Beaker, of 200 ml capacity.6.2.4 Thinwire , of maximum
21、 diameter 0,125 mm. 6.2.5 Freshly distilled water, containing not more than 0,1 % of wetting agent (to help in removing airbubbles) at a temperature of (23 2) C. 6.3Selection of specimensTake three test specimens at equal distances from the sample, the distance between the outer edge of thesample an
22、d the nearest edge of the test piece being at least 100 mm, or from individual tiles.Each testspecimen should have minimum dimensions of 30 mm 30 mm or a diameter of 36 mm. 6.4 Test procedure Weigh the test specimen with the thinwire suspended around it. Record the mass, m 1 . Immerse the testspecim
23、en, still suspended by the wire, in the distilled water contained in the beaker on the pan straddle orother stationary support. Remove adhering bubbles with a fine wire. Mark the level of immersion and recordthe mass of the immersed test specimen, m 2 . Immerse the remaining test specimen at the sam
24、e level.6.5Calculation and expression of results Calculate the density, , in kilograms per cubic metre, of the test specimen from the following equation: = (m 1 H 2 O)/( m 1 m 2 ) where m 1 is the initial weight of the test specimen, in kilograms;m 2 is the weight of the immersed test specimen, in k
25、ilograms; H 2 Ois the densityof water,at the temperature specified in 6.2.5, in kilograms per cubicmetre. Calculate the mean result for the three test specimens and express the result to the nearest 1 kg/m3 . 6.6 Precision statementA round-robin test will be conducted to determine the precision of t
26、his method. 7 Method B 7.1 Principle A test piece of known dimensions isweighed and its density calculated from the quotient of mass and volume. This method cannot be used if the surface and/or back side has a texture. BS EN ISO 23996:2012 EN ISO 23996:2012 (E)47.2 Apparatus 7.2.1 Apparatus describe
27、d in ISO 24342, for measuring the side length and width of the rectangularsample.7.2.2 Apparatus described inISO 24346, formeasuring the thickness of the sample.7.2.3 Balance, with a sensitivity of 1 mg. 7.3Selection of specimensCut three test specimens of at least 100 mm 100 mm using a rectangular
28、shape. From the sample, cut the test specimens at equal distances from each other. The distance between the outer edge of the sample and the nearest edge of the test specimens shall be at least 100 mm. In the case of tiles, take the three individual tiles.7.4 Test procedure For each test, measure an
29、d record the thickness and the dimensions to the nearest 0,1 mm. Weigh each testspecimen separately and record the mass to the nearest 10 mg. 7.5Calculation and expression of results Calculate the density, , in kilograms per cubic metre, using the following equation and round off to the nearest 0,01
30、. = 10 6 M / Vwhere M is the mass of the test specimen, in grams;V is the volume of the test specimen, in cubic millimetres.Calculate the mean value of the three test specimen and round off to the nearest 0,1 kg/m3 . 7.6 Precision statementA round-robin test will be conducted to determine the precis
31、ion of this method. 8 Test reportThe test report shall contain the following information:a) a statement that the tests were performed in accordance with this International Standard (ISO 23996), method A or B; b) date(s) on which the tests were carried out; c) complete identification of the product t
32、ested, including type, source, colour and manufacturers reference numbers;d) previous history of the sample; e) anydeviation from this International Standard which mayhave affected the results;f) mean value of the density.BS EN ISO 23996:2012 EN ISO 23996:2012 (E)5Bibliography1 ISO 1183 (all parts),
33、 Plastics Methods for determining the density of non-cellular plastics2 EN 436, Resilient floor coverings Determination of densityBS EN ISO 23996:2012 EN ISO 23996:2012 (E)6blankBSI is the independent national body responsible for preparing British Standards and other standards-related publications,
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