BS 6882-1987 Guide for storage of raw solid natural and synthetic rubber《固体天然橡胶和合成橡胶储存指南》.pdf

1、BRITISH STANDARD BS 6882:1987 Guide for Storage of raw solid natural and synthetic rubber UDC 678.7:678.4.032:678.44BS6882:1987 This British Standard, having been prepared under the directionof the Rubber StandardsCommittee, was published under the authority ofthe Board of BSI and comes intoeffect o

2、n 30September 1987 BSI 08-1999 The following BSI references relate to the work on this standard: Committee references RUM/20 and RUM/27 Draft (ref. 85/40689) announced inBSI News October 1986 ISBN 0 580 16083 1 Committees responsible for this British Standard The preparation of this British Standard

3、 was entrusted by the Rubber Standards Committee (RUM/-) to Technical Committees RUM/20 and RUM/27 upon which the following bodies were represented: British Rubber Manufacturers Association Chemical Industries Association Ministry of Defence Plastics and Rubber Institute Tropical Growers Association

4、 Amendments issued since publication Amd. No. Date of issue CommentsBS6882:1987 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Storage accommodation 1 3 Contamination 1 4 Rotation of stocks 1BS6882:1987 ii BSI 08-1999 Foreword This British Standard has

5、been prepared under the direction of the Rubber Standards Committee. It is based on ISO/TR7664:1984 “Rubber, raw solid natural and synthetic General guidance on storage” published by the International Organization for Standardization (ISO). The principal difference is that in ISO/TR7664 a storage te

6、mperature higher than25 C is permitted and the wording in that subclause (2.2) has been improved in this British Standard to make the meaning clearer. Under unfavourable storage conditions, all types of raw rubber change to a certain extent in physical and/or chemical properties. Ultimately they may

7、 become unserviceable, for example because of hardening, softening, surface degradation and discoloration, resulting in a different behaviour during processing and/or differences in properties of the vulcanizates. These changes may be the result of one particular factor or a combination of factors,

8、mainly the action of oxygen, light, temperature and humidity. The deleterious effects of these factors may, however, be minimized by an appropriate choice of storage conditions. This British Standard, therefore, indicates the most suitable conditions for storage. A British Standard does not purport

9、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. Summary of pages This document comprises a front cover, an inside front cover

10、, pagesi andii, page1 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 cover.BS6882:1987 BSI 08-1999 1 1 Scope This British Standard provides information on the most suita

11、ble conditions for the storage of raw natural and synthetic rubber delivered in the form of bales. NOTEFor rubber delivered in the form of powder, loose crumb or pellets, extra care should be taken because of the far greater exposed surface area. In addition, “particulate” rubber can agglomerate und

12、er the influence of elevated temperature and/or pressure. 2 Storage accommodation 2.1 General The storage space should be clean, dry, well ventilated and of a moderate temperature. 2.2 Temperature The storage temperature should lie between15 C and25 C. Whereas exposure to too high a temperature may

13、cause irreversible changes to properties, the effect of low temperature may in some cases induce crystallization which is reversible and therefore not permanently deleterious. Crystallized or partially crystallized rubbers are hard and may show difficulties during the mixing process. Such crystalliz

14、ation should be removed by raising the temperature during a sufficient period of time prior to processing. 2.3 Heating Sources of heat in storage rooms should be so arranged and screened that the temperature of the stored rubber does not exceed25 C. 2.4 Humidity Moist conditions should be avoided; s

15、torage conditions should be such that condensation on the rubber or the wrapping does not occur. Moisture can influence the processing and even the cure behaviour of the rubber. Moreover, excessive humidity may cause hydrolysis of certain kinds of rubber. 2.5 Light Raw rubbers should be protected fr

16、om light and in particular from direct sunlight and strong artificial light with a high ultraviolet content. Unless the rubber is packed in opaque wrapping, it is advisable to cover any windows of storage rooms with a red or orange coating or screen. Otherwise, crates or pallets should be covered. T

17、he use of normal incandescent lamps is preferable. 3 Contamination Raw rubber should be protected completely from dust and all other kinds of foreign material, with the exception of the packaging rubber used by the producers for wrapping the bales or packaging the raw rubber. All direct contact with

18、 other kinds of rubber should be avoided. It is recommended that the rubber be kept in the packaging as delivered until required for use. 4 Rotation of stocks Raw rubbers should remain in store for as short a time as possible. Therefore, the rubber should be issued from stores in rotation so that th

19、e rubber remaining in store is of the latest delivery.BS 6882:1987 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. I

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