untitled BRITISH STANDARD BS EN 648 2006 Paper and board intended to come into contact with foodstuffs — Determination of the fastness of fluorescent whitened paper and board The European Standard EN[.]
BRITISH STANDARD Paper and board intended to come into contact with foodstuffs — Determination of the fastness of fluorescent whitened paper and board The European Standard EN 648:2006 has the status of a British Standard ICS 67.250; 85.060 12&23 140 g/m² are to be investigated, an appropriate even number of glass fibre paper layers (5.1) is used so that the total of their grammages just exceeds the grammage of the test piece Construct the assembly as described in 9.2, with each glass fibre paper being individually saturated and wiped and arranged in such a way that the same number of glass fibre papers are in contact with both sides of the test piece 9.4 After 24 h open the assembly Place the glass fibre papers on adjacent glass rods, Ø mm to Ø 10 mm, with the side which was in contact with the test piece upwards, cover them without contact to prevent light penetration and air-dry at ambient temperature Glass fibre papers saturated with olive oil are not dried 10 Procedure B (short time contact) 10.1 Immerse two sheets of unstained glass fibre papers (5.1) in a test fluid (6.2, 6.3, 6.4 or 6.5) Remove the sheets after saturation and free the sheets from excess fluid by wiping them on the rim of the container 10.2 Place one sheet of unstained glass fibre paper with its smooth side upwards on the glass plate (5.4) Place the test piece (8) immediately on top and cover it with the second saturated sheet of glass fibre paper EN 648:2006 (E) so that the smooth side of the glass fibre paper is in contact with the test piece again Place a second glass plate (5.4) on top, wrap the total assembly in polyethylene film (5.5) to prevent the edges from dying out, load it with a mass of kg (5.6) and allow it to stand for 10 at (23 ± 2)° C with protection against direct light penetration 10.3 If test pieces of a grammage > 140 g/m² are to be investigated, an appropriate even number of glass fibre paper layers (5.1) is used so that the total of their grammages just exceeds the grammage of the test piece Construct the assembly as described in 9.2, with each glass fibre paper being individually saturated and wiped, and arranged in such a way that the same number of unstained glass fibre papers are in contact with both sides of the test piece 10.4 After 10 open the assembly Place the glass fibre papers on adjacent glass rods, Ø mm to Ø 10 mm, with the side which was in contact with the test piece upwards, cover them without contact to prevent light penetration and air-dry at ambient temperature Glass fibre papers saturated with olive oil are not dried 11 Comparison papers 11.1 Solutions for comparison papers Prepare the following stock solution (1000 mg/l) Dissolve g of fluorescent whitening agent (6.1) in 800 ml distilled or deionised water (6.2) and make up to l Using this stock solution, prepare the following standard concentrations Table – Standard concentrations for stock solutions Evaluation grade FWA solution FWA mg/l 125 ml stock solution diluted to l 125 31 ml stock solution diluted to l 31 ml stock solution diluted to l ml stock solution diluted to l The stock solutions and the dilutions shall always be freshly prepared 11.2 Preparation of fluorescent whitened comparison papers Glass fibre papers (5.1 and 5.2) are used as comparison papers and are treated as follows: Cut out round samples with a diameter of 30 mm from the glass fibre paper Apply 100 µl standard liquid of the defined concentration on a watch glass dish with a diameter of 40 mm (5.3) Put the round sample of the glass fibre paper on the watch glass dish with the standard liquid and distribute the standard liquid equally into the glass fibre paper (e g using a stamp) Put the accordingly prepared round sample on the normal glass fibre paper of 90 mm × 60 mm Air dry the accordingly prepared reference papers in the dark and mark them with the number of the evaluation grade which corresponds to the FWA solution EN 648:2006 (E) For the test of fastness in olive oil, use comparison papers which are subsequently immersed in olive oil (6.5) To remove the excess oil, press the comparison papers briefly between dry filter papers 12 Evaluation Compare the staining of the glass fibre papers on the side with which they were in contact with the sample with the comparison papers prepared in accordance with 11.2 under the UV lamp (5.7) Use UV light in the range UV-A to illuminate the samples When several layers glass fibre papers are used, evaluate only the layer that was in contact with the test piece A distinction is drawn between five different evaluation grades: grade signifies poor fastness; grade signifies good fastness The evaluation grade of the comparison paper which is the most similar to the stained glass fibre paper is given as the evaluation grade of the tested paper Faint fluorescence (small bright spots) may appear at the glass fibre paper without transfer of fluorescent whitening agents As this phenomenon may be caused by other components in the paper from the edges of the sample piece or from dust from the air, it should not be taken as bleeding of fluorescent whitening agents Therefore, fluorescence less than corresponding with grade is not an indication of bleeding of fluorescent whitening agents and shall be evaluated as grade If the two sides of the sample produce different results, the test report shall state to which side of the sample the data relates NOTE In the case of paper or board that comes into contact with foodstuffs only with one side (e g food packaging) and it is known which side is intended to make contact with the food, only this side will be evaluated 13 Test report The test report shall include the following information: a) reference to this European Standard; b) test result; c) designation of the paper or board tested, side tested if applicable; d) procedure A or B; e) test fluids and associated evaluation notes; f) date of test; g) any deviation from this European Standard blank BS EN 648:2006 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001 Email: orders@bsi-global.com Standards are also available from the BSI website at http://www.bsi-global.com In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048 Email: info@bsi-global.com Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: membership@bsi-global.com Information regarding online access to British Standards via British Standards Online can be found at http://www.bsi-global.com/bsonline Further information about BSI is available on the BSI website at http://www.bsi-global.com Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI BSI 389 Chiswick High Road London W4 4AL This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained Details and advice can be obtained from the Copyright & Licensing Manager Tel: +44 (0)20 8996 7070 Fax: +44 (0)20 8996 7553 Email: copyright@bsi-global.com