BS-ISO-7229-1997.pdf
《BS-ISO-7229-1997.pdf》由会员分享,可在线阅读,更多相关《BS-ISO-7229-1997.pdf(10页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS ISO 7229:1997 Rubber- or plastics-coated fabrics Measurements of gas permeability ICS 59.080.40 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:05:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7229:1997 This British Standard, having been prepared under the direct
2、ion of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 1997 BSI 02-1999 ISBN 0 580 27765 8 National foreword This British Standard has been prepared by Technical Committee TCI/78, Coated fabrics. It is identical
3、with ISO 7229:1997 Rubber- or plastics-coated fabrics Measurement of gas permeability published by the International Organization for Standardization (ISO). Coated fabrics are employed for a wide variety of end-uses, from protective/safety clothing materials to building and civil engineering. Each o
4、f these end-uses has its own special requirements in respect of the level of permeability of various gases, liquids or chemicals, e.g. helium for balloons, CO2 for inflatable life-rafts. Users may also wish to refer to BS 903-A30. A list of organizations represented on this committee can be obtained
5、 on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or using the “Find” facility
6、 of the BSI Standards Electronic Catalogue. 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 obligation
7、s. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, page ii, pages 1 to 3 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
8、 the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:05:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7229:1997 BSI 02-1999i Contents Page National forewordInside front cover Forewordii 1Scope1 2Normative r
9、eferences1 3Principle1 4Apparatus1 5Test pieces1 6Conditioning1 7Test atmosphere2 8Procedure2 9Expression of results3 10Test report3 Figure 1 Apparatus (schematic diagram)2 Figure 2 Measurement cell3 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:05:06 GMT+00:00 2006, Uncontrolled Copy, (
10、c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:05:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:05:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7229:1997 ii Foreword ISO (the International Organization for S
11、tandardization) is a worldwide federation of national standards bodies (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 ri
12、ght to be represented on that committee. International organizations, 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. Draft Intern
13、ational 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 member bodies casting a vote. International Standard ISO 7229 was prepared by Technical Committee ISO/TC 45, Rubber
14、 and rubber products. Descriptors: Fabrics, woven fabrics, coated fabrics, fabrics coated with plastics, fabrics coated with rubber, tests, gas permeability tests, tracer method. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:05:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7229:19
15、97 BSI 02-19991 WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health
16、 practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies a method of measuring gas transmission through fabrics coated with plastics or rubber, a property known as permeability. It is particularly applicable when the anticipated perme
17、ability is less than 3 dm3/(dm2) (cubic decimetres per day per square metre); when particular temperature or pressure conditions are required; when the measurement requires the use of particular gases, either in the pure state or as a mixture. 2 Normative references The following standards contain p
18、rovisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate th
19、e possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 2231:1989, Rubber- or plastics-coated fabrics Standard atmospheres for conditioning and testing. ISO 2286-1:1), Rubber- or pl
20、astics-coated fabrics Determination of roll characteristics Part 1: Method for determination of the length, width and net mass of a roll. ISO 3601-1:1988, Fluid systems Sealing devices O-rings Part 1: Inside diameters, cross-sections, tolerances and size identification code. 3 Principle A test piece
21、 is placed between two parts of a hermetically sealed measurement cell. One surface of the test piece, chosen for convenience, is subjected to the constant pressure of a tracer gas while the other is in contact with a vector gas flowing at a constant rate into the cell. An analyser system at the cel
22、l outlet measures the concentration of the tracer gas in the vector gas, from which the permeability of the test piece to the tracer gas is then determined. 4 Apparatus (see Figure 1) 4.1 Measurement cell, with a useful diameter (O-ring diameter) of 113 mm and consisting of two interlocking sections
23、 (see Figure 2). The materials of which it is made shall be inert to the gases used; in particular, they shall not retain these gases. The exact dimensions of the O-ring shall be chosen from those given in ISO 3601-1. 4.2 Flow meter: The choice of flow meter depends on the desired sensitivity which
24、depends in turn on the sensitivity of the sensor. The latter shall have an accuracy better than 3 %. 4.3 Analyser system: The choice of analyser depends on technical and economic considerations (it is difficult to detect gases in concentrations lower than 100 ppm or 104). It shall have an accuracy b
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS ISO 7229 1997
链接地址:https://www.31doc.com/p-3745661.html