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1、BS ISO 18925:2008 ICS 35.220.30; 37.040.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Imaging materials Optical disc media Storage practices Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI T
2、his British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2008 BSI 2008 ISBN 978 0 580 63268 6 Amendments/corrigenda issued since publication DateComments BS ISO 18925:2008 National foreword This British Standard is the UK implementation of
3、ISO 18925:2008. It supersedes BS ISO 18925:2002 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CPW/42, Photography. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport t
4、o include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI
5、BS ISO 18925:2008 Reference number ISO 18925:2008(E) ISO 2008 INTERNATIONAL STANDARD ISO 18925 Second edition 2008-10-15 Imaging materials Optical disc media Storage practices Matriaux pour limage Milieux pour disque optique Pratiques de stockage Licensed Copy: London South Bank University, South Ba
6、nk University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI BS ISO 18925:2008 ISO 18925:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded
7、are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Deta
8、ils of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem r
9、elating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including
10、photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in
11、 Switzerland ii ISO 2008 All rights reserved Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI BS ISO 18925:2008 ISO 18925:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1
12、 3 Terms and definitions.1 4 Environmental conditions 4 4.1 Humidity and temperature limits .4 4.2 Contaminants and gaseous impurities.4 4.3 Magnetic fields.4 5 Materials.5 6 Enclosures .5 6.1 General requirements .5 6.2 Labelling.5 7 Preparation.5 7.1 General .5 7.2 Acclimatization 5 8 Storage hous
13、ing 6 9 Storage rooms .6 10 Fire-protective storage7 11 Identification, inspection and cleaning.7 11.1 Identification 7 11.2 Inspection.7 11.3 Cleaning8 Annex A (informative) Temperature-relative humidity relationship.9 Annex B (informative) Temperature and humidity acclimatization10 Bibliography11
14、Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI BS ISO 18925:2008 ISO 18925:2008(E) iv ISO 2008 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodie
15、s (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations,
16、 governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO
17、/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the m
18、ember bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 18925 was prepared by Technical Committee ISO/TC 42, Photography. Th
19、is second edition cancels and replaces the first edition (ISO 18925:2002), of which it constitutes a minor revision. The following changes have been made to the first edition: modification of definition 3.12 (life expectancy); updating of normative and bibliographical references; removal of the orig
20、inal Annex A. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI BS ISO 18925:2008 ISO 18925:2008(E) ISO 2008 All rights reserved v Introduction Use of optical disc material is becoming widespread in audio, video and computer applications
21、. Preservation of this information is becoming of increasing concern to society, particularly as the recorded information becomes older and frequently of greater value to libraries, archives, museums, government agencies and commercial organizations. The stability of optical discs is dependent upon
22、that of the complete system. This includes the stability of the material itself, the equipment on which it is run and, in systems, upon the necessary software. ISO 18921 specifies a methodology for estimating the life expectancy of the CD-ROM. Other optical discs will be addressed in future Internat
23、ional Standards. These standards consider only the effects of temperature and humidity and do not include other factors such as light, corrosive gases and particulates. International Standards are not available on the life expectancy of hardware and the problems associated with hardware wearing out
24、or becoming obsolete. It is advisable that optical disc users store discs under conditions that will extend their life and handle the material so that it will not be subjected to stress and undergo physical breakdown during use. This International Standard addresses the concerns of long-term storage
25、. A major component of a large number of optical discs is the polycarbonate substrate. Polycarbonate is a very durable material, but it does absorb moisture and there is always an equilibrium between the ambient humidity and the moisture content of the disc. Polycarbonate is susceptible to decomposi
26、tion under certain conditions and given a suitable catalyst. The second component of most optical discs is the reflective layer. This layer is usually some highly reflective metal such as aluminium, silver or gold. Each of these materials is subject to reaction with various chemicals that can be fou
27、nd in the environment. Aluminium, for example, combines readily with oxygen to form aluminium oxide. Silver combines with sulfur to tarnish and form silver sulfides. Gold is known to react with chlorine to form gold chlorides. A third component of these discs is some type of seal coat. This is typic
28、ally a UV-cured polymer whose purpose is to protect the reflective layer and any other material layers in the disc. A fourth component, in the case of some recordable optical discs, is the dye layer. For magneto-optic or phase change discs, additional layers are also included. Regardless of the inhe
29、rent stability of the various disc layers, it is known that good storage conditions will extend the life of all optical discs. While a good storage environment cannot reverse any degradation that has already occurred, it can slow down additional deterioration. A single storage condition is described
30、 in this International Standard. This condition is intended for discs that contain recorded information of long-term value. Various manufacturers studies indicate that the life expectancy of well manufactured optical discs is in excess of 50 years under typical room ambient conditions (see 1 and 2 i
31、n the Bibliography). Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI BS ISO 18925:2008 Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI BS ISO 18925:2008 INTERNATIONAL STA
32、NDARD ISO 18925:2008(E) ISO 2008 All rights reserved 1 Imaging materials Optical disc media Storage practices 1 Scope This International Standard establishes extended-term storage conditions for optical discs and provides recommendations concerning the storage conditions, storage facilities, enclosu
33、res and inspection for optical discs. It is applicable to discs made for audio, video, instrumentation and computer use. Recommendations are general in nature and it is advisable that the manufacturers cautions for specific material be considered. Relaxation from these recommendations, whether befor
34、e or after recording, will generally result in shortened life expectancy. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenc
35、ed document (including any amendments) applies. ISO/IEC 15486:1998, Information technology Data interchange on 130 mm optical disk cartridges of type WORM (Write Once Read Many) using irreversible effects Capacity: 2,6 Gbytes per cartridge NFPA 75, Standard for the Protection of Electronic Computer/
36、Data Processing Equipment1) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 blister localized delamination that looks like a bubble 3.2 compact disc CD optical disc format in which the information layer is located at one surface of a substrat
37、e and the data can be read by an optical beam NOTE CD is the subject of IEC 60908. 3.2.1 compact disc-recordable CD-R recordable optical disc in which information can be recorded to certain areas in the compact disc format NOTE Information can be recorded once and read many times. 1) Available from
38、the National Fire Protection Association, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101, USA. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI BS ISO 18925:2008 ISO 18925:2008(E) 2 ISO 2008 All rights reserved 3.2.2 compact
39、disc read-only memory CD-ROM optical disc to which information is transferred during manufacture to certain areas in the compact disc format NOTE 1 Information can be read many times. NOTE 2 CD-ROM is the subject of ISO/IEC 10149. 3.2.3 compact disc-rewritable CD-RW recordable optical disc in which
40、information can be recorded to certain areas in the compact disc format NOTE Information can be erased and new information recorded many times and read many times. 3.3 container box, can or carton used for storage and shipping of recording materials 3.4 digital versatile disc DVD digital video disc
41、(deprecated) optical disc format in which one or more information layers are located between two substrates and the data can be read by an optical beam 3.5 delamination separation of a laminate into its constituent layers 3.6 dew point temperature at which moisture begins to condense on a surface NO
42、TE See relative humidity (3.16). EXAMPLE The more humid the air, the higher the dew point temperature. 3.7 enclosure folder, envelope, sleeve or clam shell intended for physical protection against mechanical damage 3.8 extended-term storage conditions storage conditions suitable for the preservation
43、 of recorded information having permanent value 3.9 fire-protective storage facilities designed to protect records against excessive temperatures, water and other fire-fighting agents, and steam developed by insulation of safes or caused by the extinguishing of fires and collapsing structures 3.10 i
44、nsulated record container storage box designed to withstand elevated temperatures and conforming to national standards and regulations 3.11 isoperm lines lines of constant life plotted as a function of temperature and relative humidity Licensed Copy: London South Bank University, South Bank Universi
45、ty, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI BS ISO 18925:2008 ISO 18925:2008(E) ISO 2008 All rights reserved 3 3.12 life expectancy LE length of time that information is predicted to be retrieved in a system at 23 C and 50 % relative humidity (RH) 3.13 magnetic field intensity level of the magn
46、etic field at a point in space 3.14 medium material on which the information is recorded NOTE Plural is media. 3.15 MO disc optical disc in which the information is recorded using magneto-optical technology in some specified format NOTE Information can be recorded, read many times and overwritten ma
47、ny times. 3.16 relative humidity RH ratio, defined as a percentage, of the existing partial vapour pressure of water to the vapour pressure at saturation NOTE It is usually, but not always, equal to the percentage of the amount of moisture in the air to that at saturation. 3.17 storage environment c
48、onditions for storing materials, i.e. temperature, relative humidity, cleanliness of facilities and atmospheric pollutants 3.18 storage housing physical structure supporting materials and their enclosures NOTE It can consist of drawers, racks, shelves or cabinets. 3.19 system combination of material
49、, hardware, software and documentation necessary for recording and/or retrieving information 3.20 WORM disc optical disc in which the data in specified areas can be written only once and read multiple times by an optical beam Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:49, Uncontrolled Copy, (c) BSI BS ISO 18925:2008 ISO 18925:2008(E) 4 ISO 2008 All rights reserved 4 Environmental conditions 4.1 Humidity and temperature limits The average relative humidity of an extended
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