BS 7451-1991 Specification for archival quality bookbinding leather《装钉档案用皮革规范》.pdf
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1、BRITISH STANDARD BS7451:1991 Specification for Archival quality bookbinding leatherBS7451:1991 This BritishStandard, having been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was published underthe authority of the Standards Board and comes into effect on 30Aug
2、ust1991 BSI12-1999 The following BSI references relate to the work on this standard: Committee reference TCM/17 Draft for comment90/47080 DC ISBN 0 580 19763 8 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Textiles and Clothing Standards
3、 Policy Committee (TCM/-) to Technical Committee TCM/17, upon which the following bodies were represented: British Clothing Industry Association British Footwear Manufacturers Federation British Leather Confederation Chief and Assistant Chief Fire Officers Association Consumer Policy Committee of BS
4、I Footwear Distributors Federation Hides and Allied Trades Improvement Society Institute of Trading Standards Administration Ministry of Defence Overseas Development Natural Resources Institute SATRA Footwear Technology Centre Scottish Hide, Skin and Tallow Markets Limited Society of Leather Technol
5、ogists and Chemists The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Bodleian Library British Library Edward James Foundation Leather Conservation Centre National Library of Scotland National Library of Wales Public Record Office Trinity C
6、ollege Dublin Amendments issued since publication Amd. No. Date CommentsBS7451:1991 BSI 12-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Sampling 1 4 Conditioning 1 5 Chemical and physical properties 1 6 Marking 2 Appendix A Background informa
7、tion to the standard 3 Appendix B Method of test for tarnishing 3 Appendix C Calculation of surface shrinkage in boiling water 5 Figure 1 Assembly as used for test samples 4 Figure 2 Assembly as used for control samples 5 Table 1 Chemical properties 1 Table 2 Physical properties 1 Publication(s) ref
8、erred to Inside back coverBS7451:1991 ii BSI 12-1999 Foreword This BritishStandard has been prepared under the direction of the Textiles and Clothing Standards Policy Committee. It specifies the chemical and physical properties of bookbinding leather where the overall priority is long term stability
9、 when exposed to atmospheric pollutants. It is based on data obtained from long term natural ageing of leathers and accelerated ageing in a deterioration chamber. It provides purchasers of new binding leather with an assurance of archival quality leather. Further information on the background to thi
10、s standard is given in Appendix A. 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 not of itself confer immunity from legal obligations. Summar
11、y of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front co
12、ver.BS7451:1991 BSI 12-1999 1 1 Scope This BritishStandard specifies requirements for leather to be used in archival bookbinding, for which purpose the following leathers are suitable: a) semi-alum leather, as defined in BS2780 (term234); b) chrome re-tan leather, in which the leather has been first
13、 chrome tanned throughout its thickness, then tanned with vegetable tanning agents, as defined in BS2780 (term52) and is then further treated with basic aluminium salts. Leathers tanned solely with vegetable tannins, or chrome re-tan leather in which the chrome tanned leather has been further tanned
14、 solely with vegetable tanning agents, are not suitable and are thereby excluded. In addition, although alum tawed bindings have been proved to have long term durability, alum tawing cannot be regarded as a true tannage and therefore such leather is not included in this specification. NOTEThe titles
15、 of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this BritishStandard, the definitions given in BS2780 apply. 3 Sampling Samples for physical testing shall be taken in accordance with method1 of BS3144:1968. Samples for chemical
16、 testing shall be taken in accordance with method1 of BS1309:1974. 4 Conditioning Samples shall be conditioned in accordance with method2 of BS3144:1968. 5 Chemical and physical properties The finished leather shall comply with the requirements given in Table 1 and Table 2 when tested in accordance
17、with the methods described therein. Table 1 Chemical properties Table 2 Physical properties Chemical property Method of test Requirement Semi-alum leather Chrome re-tan leather further treated with aluminium salts Aluminium content expressed as Al 2 O 3 acontent Method15 of BS1309:1974 Not less than
18、2.8% Not less than1.9% Chromium content expressed as Cr 2 O 3 acontent Method8 of BS1309:1974 None Not less than2.0% pH Method9 of BS1309:1974 Not less than4.0 Not less than4.0 Tarnish Appendix B No difference in tarnishing between test foil and control foil No difference in tarnishing between test
19、foil and control foil a Values are expressed on mass of leather containing14% moisture. Physical property Method of test Requirement Semi-alum leather Chrome re-tan leather further treated with aluminium salts Shrinkage temperature Method17 of BS3144:1968 Not less than115 C Not less than110 C Tear s
20、trength Method6 of BS3144:1968 Not less than25N Not less than25N Flexural endurance BS5131-4.2 Not less than100000 Not less than100000 Surface shrinkage in boiling water Appendix C Not greater than2% Not greater than2%BS7451:1991 2 BSI 12-1999 6 Marking 6.1 The leather shall be marked with the manuf
21、acturers name, trademark or other means of identification. 6.2 The leather shall be supplied with a label or invoice marked with the following information: a) the number and date of this BritishStandard, i.e.BS7451:1991 1) ; b) the type of leather tanning used in processing, i.e.semi-alum leather or
22、 chrome re-tan leather further treated with basic aluminium salts; c) the tannery batch number. 1) Marking BS7451:1991 on or in relation to a product represents a manufacturers declaration of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the s
23、tandard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable.BS7451:1991 BSI 12-1999 3 Appendix A Background information to the standard The
24、 need for a standard for archival leather was considered necessary because of the lack of any reliable guide by which purchasers of new binding leather could be assured of obtaining a leather with long term stability to acidic atmospheric pollutants. Previously reliance had been placed on one of the
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