1、BRITISH STANDARD BS EN 549:1995 Specification for Rubber materials for seals and diaphragms for gas appliances and gas equipment The European Standard EN 549:1994 has the status of a British StandardBSEN549:1995 This British Standard, having been prepared under the directionof the Engineering Sector
2、Board, was published underthe authority of the Standards Board and comes intoeffect on 15 May 1995 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference GSE/22 Draft for comment 92/82881 DC ISBN 0 580 23974 8 Committees responsible for this British Standar
3、d The preparation of this British Standard was entrusted to Technical Committee GSE/22, Safety and controls for gas burners and appliances, upon which the following bodies were represented: Association of Control Manufacturers TACMA (BEAMA Ltd.) British Combustion Equipment Manufacturers Association
4、 British Gas plc Department of Trade and Industry (Consumer Safety Unit, C A Division) Electricity Association L P Gas Association Society of British Gas Industries Amendments issued since publication Amd. No. Date CommentsBSEN549:1995 BSI 03-1999 i Contents Page Committees responsible Inside front
5、cover National foreword ii Foreword 2 Text of EN 549 3 List of references Inside back coverBSEN549:1995 ii BSI 03-1999 National foreword This British Standard has been prepared by Technical Committee GSE/22 and is the English language version of EN549:1994, Rubber materials for seals and diaphragms
6、for gas appliances and gas equipment, published by the European Committee for Standardization (CEN). It supersedes BS6505 which is withdrawn. EN 549 was produced as a result of international discussion in which the UK took an active part. A British Standard does not purport to include all the necess
7、ary 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. Cross-references Publication referred to Corresponding British Standard BS 903 Physical testing of rub
8、ber ISO 48 Part A26: Determination of hardness ISO 188 Part A19: Heat resistance and accelerated ageing tests ISO 247 BS 7164 Chemical tests for raw and vulcanized rubber Part 5: Methods for determination of ash content BS 903 Physical testing of rubber ISO 471 Part A35: Temperatures, humidities and
9、 times for conditioning and testing of test pieces ISO 815 Part A6: Method for determination of compression set at ambient, elevated or low temperatures ISO 1400 Part A26: Determination of hardness ISO 1407 BS 1673 Methods of test for raw rubber and unvulcanized compounded rubber Part 2: Chemical an
10、alysis of raw natural rubber BS 903 Physical testing of rubber ISO 1431-1 Part A43: Method for determination of resistance to ozone cracking (static strain test) ISO 1817:1985 Part A16: 1987 Determination of the effect on liquids BS 903 Physical testing of rubber ISO 4648 Part A38: Methods for the d
11、etermination of dimensions of test pieces and products for test purposes ISO 4650 BS 4181 Identification of rubbers by infra-red spectrometry Part 1: Method for identification of hydrocarbon, chloroprene, nitrile and chlorosulphonated polyethylene rubbers Summary of pages This document comprises a f
12、ront cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 12, 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 theinside front cover.EUROPEAN STA
13、NDARD NORME EUROPENNE EUROPISCHE NORM EN 549 November 1994 ICS 21.140; 83.060 Descriptors: Household appliances, gas appliances, adjusting systems, membranes, seals: stoppers, rubber products, classifications, specifications, mechanical properties, tests English version Rubber materials for seals an
14、d diaphragms for gas appliances and gas equipment Matriaux base de caoutchouc pour joints et membranes destins aux appareils gaz et appareillages pour le gaz Elastomer-Werkstoffe fr Dichtungen und Membranen in Gasgerten und Gasanlagen This European Standard was approved by CEN on 1994-11-08. CEN mem
15、bers are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on applicat
16、ion to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the
17、same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardiz
18、ation Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 549:1994 EEN549:1994 BSI 03-1999 2 Foreword This European Standard was prepared by the Technical Committee CEN/TC108, Sealin
19、g materials and lubricants for gas appliances and gas equipment, of which the secretariat is held by NNI. This European Standard is a compilation of EN278:1991, EN279:1991 and EN291:1992. Annex A is normative and contains verification of components by physical and chemical testing, Annex B is also n
20、ormative and contains verification of components by infra-red spectrometric method. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association and supports essential requirements of EC Directive(s). This European Standard
21、shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December1995, and conflicting national standards shall be withdrawn at the latest by December1995. In accordance with the CEN/CENELEC Internal Regulations, the following c
22、ountries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative refere
23、nces 3 3 Definitions 4 4 Manufacturers declared information 4 5 Classification 4 6 Requirements 4 7 Test methods 6 Annex A (normative) Verification of components by physical and chemical testing 9 Annex B (normative) Verification of components by infra-red spectrometric method 11 Table 1 Temperature
24、 classes 4 Table 2 Hardness classes 4 Table 3 Requirements for material used to manufacture seals 5 Table 4 Requirements for material used to manufacture diaphragms 6 Table 5 Test method 8 Table A.1 Requirements for component seals 10 Table A.2 Requirements for component diaphragms 10 Table A.3 Test
25、 methods for components 11EN549:1994 BSI 03-1999 3 Introduction This European Standard specifies the requirements for materials to be used for the manufacture of seals and diaphragms. It specifies for that purpose, tests to be carried out on standardized test pieces taken from sheets of material, si
26、nce the small size of most components does not, in general, allow for the necessary standard samples to be prepared from them in order to undertake the complete range of tests. It may be necessary to carry out supplementary tests on the component mounted in the gas appliance, or in equipment such as
27、 safety and control devices, to confirm the functional suitability of the component. Such tests should be performed under the most severe service conditions envisaged in the appropriate standards for the gas appliances and/or equipment. 1 Scope This standard specifies requirements and associated tes
28、t methods for vulcanized rubber materials used in gas appliances and equipment in contact with1st,2nd and3rd family combustible gases. It also establishes a classification based on temperature range and hardness. This standard is applicable to materials from which are manufactured homogeneous seals
29、and homogeneous or reinforced diaphragms. The normal range of operating temperatures covered by this standard is0C to +60C. Tests are also included for applications using diaphragms within the range 20C to +80C and seals within the range 20C to +150C. For temperatures outside these ranges the user s
30、hould contact the manufacturer regarding the suitability of the rubber material. This standard includes two normative annexes for the verification that a component (finished product) was produced from a previously type tested material complying with requirements of this standard as declared by the a
31、ppliance or equipment manufacturer or supplier of the component. This standard is not applicable to silicone rubber used either above200mbar nominal pressure or at temperatures below0C with3rd family gases as there is possibility of condensation. This standard is also not applicable to seals and dia
32、phragms for devices in gas transmission systems nor in such equipment used in1st and2nd family gas distribution systems. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropria
33、te places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publicatio
34、n referred to applies. ISO 37, Rubber vulcanized Determination of tensile stress-strain properties. ISO 48, Vulcanized rubbers Determination of hardness (Hardness between30 and85 IRHD). ISO 188, Rubber vulcanized Accelerated ageing or heat-resistance tests. ISO 247, Rubber Determination of ash. ISO
35、471, Rubber Standard temperatures, humidities and times for the conditioning and testing of test pieces. ISO 815, Rubber, vulcanized or thermoplastic Determination of compression set at ambient elevated or low temperatures. ISO 1400, Vulcanized rubbers of high hardness(85to100 IRHD) Determination of
36、 hardness. ISO 1407, Rubber Determination of solvent extract. ISO 1431-1:1989, Rubber vulcanized or thermoplastic Resistance to ozone cracking Part 1: Static strain test. ISO 1817:1985, Rubber, vulcanized Determination of the effect of liquids. ISO 4648, Rubber, vulcanized or thermoplastic Determina
37、tion of dimensions of test pieces and products for test purposes. ISO 4650, Rubber Identification Infra-red spectrometric method. EN549:1994 4 BSI 03-1999 Table 1 Temperature classes 3 Definitions For the purposes of this standard the following definitions apply. 3.1 component finished product manuf
38、actured from rubber material 3.2 seal A component used as an interface between parts of a gas appliance or parts of gas equipment to achieve gas tightness. 3.2.1 static seal a component which ensures a seal between two parts of a gas appliance or parts of gas equipment which do not have relative mov
39、ement (“O” rings, sheet gaskets, etc.) 3.2.2 dynamic seal a component which ensures a seal between two parts of a gas appliance or parts of gas equipment which have relative movement (lip seals, valve pads and some “O” rings) 3.3 diaphragm a membrane of rubber material located in a fixture and servi
40、ng as a flexible gas tight partition between two chambers 3.4 reinforcement woven or unwoven material arranged in or on the rubber type material, thus reinforcing certain properties of such, for example the bursting strength of diaphragms 4 Manufacturers declared information The manufacturer respons
41、ible for the production of material complying with this standard shall ensure that he declares the following information which shall be documented: a unique material reference; the nominal hardness; the maximum working temperature of the material; the minimum working temperature of the material; whe
42、ther the material is resistant to ozone; for reinforced material, a full specification of the reinforcement, for example type of material, basic construction and decitex. NOTEIt is recommended that diaphragms should be ozone resistant. Because of the potential interruption of any protective surface
43、coating, such as waxes, by dynamic flexing such methods of protection against ozone attack shall not be used without additional protective additives. 5 Classification Materials shall be classified according to temperature range and hardness as given inTable 1 and Table 2 respectively. NOTESeals can
44、be manufactured from materials of classA1 toE1 andA2 toE2, whilst diaphragms are prepared from classA1 toB1 andA2 toB2. Table 2 Hardness classes EXAMPLE: The classification of a rubber material applicable over the temperature range of 20C to+80C with a declared nominal hardness of70IRHD would be B2/
45、H3. 6 Requirements 6.1 General Materials shall be free from porosity, inclusion, blisters and surface imperfections visible to the naked eye even after cutting. 6.2 Physical and chemical properties of rubber materials used for the manufacture of seals When tested in accordance with the methods detai
46、led in clause7, using standard test pieces, the material shall comply with the requirements given inTable 3. 6.3 Physical and chemical properties of rubber material used for the manufacture of diaphragms When tested in accordance with the methods detailed in clause7, using standard test pieces, the
47、material shall be in accordance with the requirements given inTable 4. Values in degrees C Class A1 B1 C1 D1 E1 A2 B2 C2 D2 E2 Range of operating temperature from 0 0 0 0 0 20 20 20 20 20 to 60 80 100 125 150 60 80 100 125 150 Values in IRHD Class H1 H2 H3 Nominal hardness range60 to 90EN549:1994 BS
48、I 03-1999 5 Table 3 Requirements for material used to manufacture seals Property Unit Hardness class H1 H2 H3 Hardness Tolerance on stated nominal hardness IRHD 5 5 5 Tensile strength MPa $ 5 $ 7 $ 7 Elongation at break % $ 125 $ 125 $ 125 Compression set at high temperature a at low temperature 0C
49、at low temperature 20C % % % # 40 # 40 # 50 # 40 # 40 # 50 # 40 # 40 # 50 Resistance to ageing change in hardness, max. change in tensile strength, max. change in elongation at break, max. IRHD % % 10 40 40 10 40 40 10 40 40 Resistance to gas b change in mass after immersion, max. % change in mass after drying, max. % Resistance to lubricants c change in hardness, max. change in mass, max. IRHD % 10 10 10 Resistance to o
