1、FORM 36 Version 4.3 Draft for Public Comment DPC no.: 99/714525DC I Head office 389 Chiswick High Road London W4 4AL Telephone: 020 8996 9000 Fax: O20 8996 7400 www. bsi .org . u k Date: 30/09/99 Latest date for receipt of comments: end of December 1999 Project no.: 1998/02502 Responsible committee:
2、 ACE125 Rubber and elastomeric materials for aerospace purposes Interested committees: Draft: AECMA prEN 2751 Title: Aerospace series - Storage conditions for rubber products - Requirements for storage, cleaning and maintenance WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH S
3、TANDARD. THIS DRAFT IS NOT CURRENT BEYOND ITS EXPIRY DATE FOR COMMENTS. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. See overleaf for information on commenting. No copying is allowed, in any form, without prior written
4、 permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Further copies of this draft may be purchased from BSI Customer Services, at the Head Office address above, telephone 020 8996 9001, fa
5、x 020 8996 7001, e-mail ordersa-bsi.ora.uk. NOTE British, international and foreign standards are also available from Customer Services Information on the Co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-referen
6、ces The British Standards which implement international or European publications referred to in this draft may be found by referring to the British Standards Online Service on the BSI website under the International Relationship information. This information is also available within the BSI catalogu
7、e (paper version) and the BSI Standards Electronic Catalogue (CD). The Online Service can also be used to find information on draft standards related to international or European publications. Responsible BSI committee Secretary: PAUL RYDON Direct tel: 020 8996 7266 E-mail address: paul-rydonbsi.org
8、.uk NO. 2a,30109199 I FORM 36 Version 4.3 Commenting on drafts Introduction This draft standard is based on European discussions in which the UK took an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are rece
9、ived to the contrary, then the UK will approve this draft and implement it as a British Standard. Comment is particularly welcome on national legislative or similar deviations that may be necessary. Even if this draft standard is not approved by the UK, if it receives the necessary support in Europe
10、, the UK will be obliged to publish the official English Language text unchanged as a British Standard and to withdraw any conflicting standard. UK vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. Format The guidance given below
11、 is intended to ensure that all comments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. Each comment shall make one point only, be clearly separated from the others and be structured as follows in clause order:
12、0 clause/sub-clause; 0 paragraph/table/figure number; type of comment (general, technical or editorial); 0 comment (with rationale); 0 proposed change. Submission All comments should be submitted to the committee secretary at the Head Office address, preferably electronically via e-mail or on disket
13、te (MS-DOS compatible, 1.44 megabytes). Comments should be compatible with Version 6.0 or Version 97 of Microsoft Word for WindowsTM, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to the format requirements given ab
14、ove. No acknowledgement will normally be sent. Microsot and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. This DPC refers to a draft text currently under discussion within a technical committee of AECMA (The European Association of Aerospace Industries). The
15、latest date for comment to the AECMA technical committee may occur before the expiry of the DPC comment date. Any comments received as a result of the DPC, after this expiry date, will be reviewed by the relevant BSI committee and taken into account when they consider any further UK vote on the draf
16、t or the possible BS EN publication. ) AECMA consists of the national aerospace trade associations from nine European countries, the UK member being SBAC ( Society of British Aerospace Companies). AECMA has been given a mandate by CEN to prepare all European Aerospace Standards on its behalf. 2 F? P
17、 o e N Ln b a 4 3 o o a n c - N O Ln N s cn m 7 o C o o u tn c c, E“ E O o O c O tn tn a 3 tn ic .I .I E 8 s (CI a n ! ! ! il o m o - .- 9 E E m ln .- c. .- - I U. C E E s .- u o a 3 v) U 3 U c m v) v) U .- 3 3 al uc t Po 3 m- Inn m2 m ? m O O c) . Co- N o 2 prEN 2751 DRAFT e: AECMA taition: 3eptemD
18、er STUDY: C 7 DRAFT N“: 7 STAGE: 16-1 Ref.: Superseding Ref. : ENGLISH VERSION Aerospace series Storage conditions for rubber products Requirements for storage, cleaning and maintenance Srie arospatiale Conditions de stockage des produits a base dlastomres Exigences au niveau du stockage, du nettoya
19、ge et de lentretien Luft- und Raumfahrt Lagerungsbedingungen fr Erzeugnisse aus Elastomeren Anforderungen an die Lagerung, Reinigung und Wartung Master document: u en 0 fr de Sponsor: THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION Gulledelle 94, B-1200 Bruxelles, Tel.: (+32) 27 7
20、5 81 10, Fax: (+32) 27 75 81 11 Page 2 prEN 2751 : 1996 Contents 1 Field of application 2 General 3 Storage warehouse 4 Storage and handling 5 Cleaning and maintenance Page 3 prEN 2751 : 1996 1 Field of application 1.1 This standard applies to products made of rubbers and elastomers both im pure for
21、m and mixed with other materials. 1.2 The requirements specified in clauses 3 and 4 apply primarily to long-term storage (generally exceeding 6 months). For short-term storage (not exceeding 6 months), for example in production and distribution warehouses with continuous flow of materiais, this stan
22、dard applies analogously with the exception of the general requirements relating to the warehouse given in clause 3 and paragraph 3.1, provided that the appearance and the properties of the rubber products are not adversely affected. 2 General The majority of rubber products show signs of deteriorat
23、ion in their physical properties when stored in unsuitable conditions or when handled in a manner which does not comply with the accepted practice. This may result in a reduction of their service life and they may become unuseable, e.g. through excessive hardening, softening, permanent deformation,
24、as well as flaking, cracking or other surface defects. The deterioration may be caused by oxygen, ozone, heat, light, humidity, solvents or by storage under stress. Suitably stored and handled rubber products remain practically unchanged over a long period (several years) as far as their properties
25、are concerned. 3 Storage warehouse The storage warehouse shall be cool, dry, dust-free and moderately ventilated. A weather protected storage in the open is not permitted. 3.1 Temperature The storage temperature of the rubber products depends on the product to be stored and the rubber base used. Rub
26、ber products shall not be stored below O OC or above +20 OC. Higher and lower temperatures are permissible for short periods only. Rubber products exposed to lower temperatures during storage and in transit may stiffen. These rubber products shall be conditioned at temperatures of +20 OC or above fo
27、r an adequate period before installation or subsequent treatment. To avoid moisture condensing on the rubber product it should remain packed. 3.2 Heating When stored in heated warehouses rubber products shall be protected from the source of heat. The distance between heating source and product shall
28、 be at least 1 m. HZLF (ID13 .F/Q/B) Page 4 prEN 275 1 : 1996 3.3 Humidity Storage in damp warehouses shall be avoided. Care shall be taken to avoid condensation. A relative humidity of less than 70 % is most favorable, which should, however, not fall below 45 %. 3.4 Light Rubber products shall be p
29、rotected from light, in particular from direct exposure to sunlight and strong artificial light containing a high proportion of ultra violet radiation. For this reason, warehouse windows shall be provided with a red or orange (definitely not blue) protective coat. 3.5 Oxygen and ozone Rubber product
30、s shall be protected against air circulation by storage in air-tight containers or by some other suitable means. Since ozone is particularly deleterious, warehouses shall not contain any stationary equipment producing ozone, such as electric motors or other equipment which may produce sparks or elec
31、tric discharges. Combustion gases and vapours which, as a result of photo-chemical processes, may lead to the formation of ozone, shall be avoided. 3.6 Miscellaneous Solvents, fuels, lubricants, chemicals, acids, disinfectants, sealing compounds, etc. shall not be stored together with rubber product
32、s in the same warehouse. 4 Storage and handling 4.1 General Care shall be taken that products are stored in a stress-free condition, .e. without tension, pressure, or other deformation since stress may cause permanent deformation as well as the formation or cracks. Non-ferrous metals, especially cop
33、per and manganese, have an adverse effect on rubber products. Therefore, rubber products shall not be stored in contact with non-ferrous metals, but protected by packing or coating with a suitable material e.g. anti-static films, paper, polyethylene or polyamide bags. Plasticized films shall not be
34、used for packaging. If rubber products are powdered, the powder shall not contain any ingredients adversely affecting the rubber products. Materials suitable for powdering are French chalk, prepared chalk, fine grain mica powder and rice starch. Contact between vulcanized products of different compo
35、sitions shall be avoided. Rubber products shall be stored for as short a period as possible. Rubber products shall be issued on the basis of the first in first out. 4.2 Tyres Tyres shall be stored in warehouses as per clause 3 according to paragraphs 4.2.1 and 4.2.2. H 2 LF D13. FIQIB) i Page 5 prEN
36、 2751 : 1996 4.2.1 For long periods of storage tyres shall be stored vertically, in one layer, on racks, at least 1 O cm from the ground. To avoid deformation, tyres should be rotated once per month. 4.2.2 For short-term storage (not exceeding 4 weeks) tyres shall be stacked horizontally one above t
37、he other on wooden slats, the stacks not exceeding 1,20 m in height. For storage longer than 4 weeks, restacking is necessary. 4.3 Flexible containers 4.3.1 Storage Flexible containers made of rubber coated fabric shall only be stored in their original or an identical packing. For this purpose, the
38、metal flanges shall be sealed with a suitable adhesive paper. The container shall be loosely folded in a tubular polyethylene film which shall be heat-sealed at both ends. External packaging shall be a solid cardboard box of adequate size and thickness. Boxes of flexible containers may only be stack
39、ed to a height such that no package below is damaged. The bearing surface of the cardboard boxes shall be smooth and free from sharp edges. Containers shall be issued on the basis of the first in first out (see packaging date on the cardboard box). Flexible containers having contained fuel shall be
40、preserved before storing, however 1 O days after emptying at the latest. Preservation shall be performed by coating or spraying the entire internal surface of the containers with light engine oil. 4.3.2 Handling Flexible containers shall only be transported in their packages on suitable vehicles. Th
41、e packages shall not be dropped or thrown. After removal from their packaging, the flexible containers shall be checked for damage. The containers shall not be lifted or moved using the metal flanges. The tools and supports used shall be free from sharp edges. When handling the containers, ambient t
42、emperature shall be at least 1 O OC. 4.4 Storage of other rubber products Sheets and strips may be stored either flat or in rolls; when stored flat the whole of their surface shall be supported. Rubber coated fabrics shall be hung, coiled on rollers. Cables and cords shall be stored in coils (but no
43、t stacked one upon the other), or hung coiled on rollers or reels. Drive belts shall never be stored on edge (risk of buckling) but as far as possible be hung in rolls from a spindle. During long term storage the roll shall be rotated from time to time to prevent the internal pressure from permanent
44、ly acting in one direction. V-belts may be stored flat. If, for reason of space, they are hung, then the diameter of the spindle should be at least ten times the height of the section of the belt. Flexible tubes shall be stored in coils or extended. 5 Cleaning and maintenance If necessary, rubber pr
45、oducts may be cleaned with neutral soap and warm water. Moreover, the rubber products may be cleaned in a 1,5 % solution of sodium carbonate or detergents recommended by the manufacturer. Residues of cleaning solution shall be removed by rinsing in water. The cleaned products shall be allowed to dry at ambient temperature. Page 6 prEN 275 1 : 1996 Solvents, such as trichlorethylene, carbon tetrachloride and hydrocarbons shall not be used for cleaning. Additionally, objects with sharp edges, wire brushes or abrasive paper, etc. shall not be used. HZLF DI3.FIQIB)
