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【正文】 vices. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical mittee 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: . Standards are also available from the BSI website at 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: . 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: . Information regarding online access to British Standards via British Standards Online can be found at Further information about BSI is available on the BSI website at 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. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, an d 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 amp。 如果買家 需要 PDF 格式的本標(biāo)準(zhǔn)，可以 提供郵箱給我（前提 是購買了本標(biāo)準(zhǔn)） ，我免費(fèi)發(fā)送到你的郵箱。 。C. If sample wetting is by condensation, allow at least 120 min per interval to ensure attainment of equilibrium. This time does not form part of the exposure cycle. 6 Specimens Specimens shall be of the size specified by the test methods for the properties to be measured after exposure, as detailed in the relevant product specification. 7 Procedure Mount the specimen without strain in the specimen holders with the test surface facing the lamps. Fill any spaces, using blank panels, to ensure uniform exposure conditions. Expose the specimen, measuring the irradiance and radiant exposure at the surface of the specimen. After an exposure of (4 896 177。 3) 176。 R
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