1、CEN EN*549 94 3404589 O096602 T84 BRITISH STANDARD 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 Standard - BS EN 549 : 1995 CEN ENS549 94 3404589 0096603 910 under the authority of the
2、 Standards Board and comes into Amd. No. Date effect on 15 May 1995 O BSI 1995 The following BSI references relate to the work on this standard: Committee reference GSE22 Draft for comment 92/82881 DC ISBN O 680 23974 8 BS EN 549 : 1995 %xt affected Committees responsible for this British Standard T
3、he preparation of this British Standard was entrusted to Rchnical 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 Br
4、itish Gas plc Department of Trade and Industry (Consumer Safety Unit, C A Division) Electricity Association L P Gas Association Society of British Gas Industries CEN ENx549 94 3404589 009bb04 857 = BS EN 549 : 1995 National foreword This British Standard has been prepared by Technical Committee GSE/
5、22 and is the English language version of EN 549 : 1994, Rubber materials for seab and diaphragms for gas appliances and gas equipment, published by the European Committee or Standardization (CEN). It supersedes BS 6505 which is withdrawn. EN 549 was produced as a result of international discussion
6、in which the UK took an active part. Cross-references Publication referred to IS0 48 IS0 188 IS0 247 IS0 471 IS0 815 IS0 1400 IS0 1407 IS0 1431-1 IS0 1817 : 1985 IS0 4648 IS0 4650 Corresponding British Standard BS 903 Physical testing of rubber Part A26. Determination of hardness Part A19. Heat resi
7、stance and accelerated ageing tests BS 7164 Chemical tests for raw and vulcanized rubber Part 5. Methods for determination of ash content BS 903 Physical testing of rubber Part A35. lbnperatures, humidities and times for conditioning and testing of test pieces Part A6. Method for determination of co
8、mpression set at ambient, elevated or low temperatures Part A26. Determination of hardness BS 1673 Methods of test for raw rubber and unwulcanized compounded rubber Part 2. Chemical analysis of raw natural rubber BS 903 Physical testing of rubber Part A43. Method for determinution of resistance to o
9、zone crackiw (static strain test) Part A16. 1987 Determination of the effect on liquids BS 903 Physical testing of rubber Part A38. Methods for the determination of dimensions of test pieces and products for test purposes BS 4181 Identification of rubbers by infra-red spectrometry Part 1, Method for
10、 identification of hydrocarbon, chloroprene, nitrile and chlorosulphonated polyethylene rubbers Compliance with a British Standard does not of itself confer immunity from legal obligations. i CEN ENx549 94 3404589 009bb05 793 EUROPEAN STANDARD EN 549 NORME EUROPENNE EUROPISCHE NORM November 1994 ICs
11、 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 and diaphragms for gas appliances and gas equipment Matriaux bas
12、e 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 members are bound to comply with the CENXENELEC Internal Regulat
13、ions 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 application to the Central Secretariat or to any CEN member. This Euro
14、pean 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 same status as the official versions. CEN members are the nati
15、onal 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 Standardization Comit Europen de Normalisation Europisches Komitee fr No
16、rmung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1994 Copyright reserved to CEN members Ref. No. EN 549 : 1994 E CEN EN*549 94 = 3404589 0076606 62T 9 Page 2 EN 549 : 1994 Foreword This European Standard was prepared by the Technical Committee CEN/TC 108, Sealing materiais and lubric
17、ants for gas appliances and gas equipment, of which the secretariat is held by NNI. This European Standard is a compilation of EN 278 : 1991, EN 279 : 1991 and EN 291 : 1992. Annex A is normative and contains verification of components by physical and chemical testing, annex B is also normative and
18、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). Contents This European Standard shal
19、l be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 1995, and conflicting national standards shall be withdrawn at the latest by December 1995. In accordance with the CENKENELEC Internal Regulations, the following coun
20、tries 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. A Foreword Introduction 1 Scope 2 Normative references 3 Definitions 4
21、Manufacturers declared information 5 Classification 6 Requirements 7 Test methods Annex (normative) Verification of components by physical and chemical testing (normative) Verification of components by infra-red spectrometric method Page 2 3 3 3 4 10 13 CEN EN+549 94 3404589 009bb07 566 Introduction
22、 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, since the small size of most components does not, in general, all
23、ow 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 safety and control devices, to confirm the functional suitabil
24、ity 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 test methods for vulcanized rubber materials used in gas appliance
25、s and equipment in contact with Ist, 2nd and 3rd 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 and homogeneous or reinforced diaphragms. The normal range o
26、f operating temperatures covered by this standard is O OC to +60 OC. %sts are also included for applications using diaphragms within the range -20 OC to +80 OC and seals within the range - 20 OC to + 150 OC. For temperatures outside these ranges the user should contact the manufacturer regarding the
27、 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 appliance or equipment manufacturer or suppli
28、er of the component. This standard is not applicable to silicone rubber used either above 200 mbar nominal pressure or at temperatures below O “C with 3rd family gases as there is possibility of condensation. This standard is also not applicable to seals and diaphragms for devices in gas transmissio
29、n systems nor in such equipment used in 1st and 2nd family gas distribution systems. Page 3 EN 549 : 1994 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in th
30、e 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 publication referred to a
31、pplies. IS0 37 IS0 48 IS0 188 IS0 247 IS0 471 IS0 815 IS0 1400 IS0 1407 IS0 1431-1 : 1989 IS0 1817 : 1985 IS0 4648 IS0 4650 Rubber vulcanized - Detmination of tensile stress-strain properties Vulcanized mbbers - Determination of hardness (Hardness between 30 and 85 IRHD) Rubber vulcanized - Accelera
32、ted ageing or heat-resistance tests Rubber - Determination. of ash Rubber - Standard temperatures, humidities and tim for the conditioning and testing of test pieces Rubber; vulcanized or themnoplastic - Determination of compression set at ambient elevated or Low temperatures Vulcanized rubbers of h
33、igh hardness (85 to 100 IRHD) - Detmination of hardness Rubber - Determination of solvent extract Rubber vulcanized or themnoplastic - Resistance to ozone cracking - Part 1: Static strain test Rubb.: vulcanized - Determination of the effect of liquids Rubbq vulcanized or thermoplastic - Determinatio
34、n of dimensions of test pieces and products for test purposes Rubber - Identification - Infra-red spectrometric method CEN ENx549 94 = 3404589 O096608 4T2 Range of operating from temperature to page 4 EN 549 : 1994 00000 -20 -20 -20 -20 -20 60 80 100 125 150 60 80 100 125 150 I able 1. hmperature cl
35、asses I I Values in degrees CI 3 Definitions For the purposes of this standard the following definitions apply. 3.1 component Finished product manufactured 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 tightn
36、ess. 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 movement (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 equipmen
37、t 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 serving 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 r
38、einforcing certain properties of such, for example the bursting strength of diaphragms. 4 Manufacturers declared information The manufacturer responsible for the production of material complying with this standard shall ensure that he declares the following information which shali be documented: - a
39、 unique material reference; - the nominal hardness; - the maximum working temperature of the material; - the minimum working temperature of the material; - whether the material is resistant to ozone; - for reinforced material, a full specification of the reinforcement, for example type of material,
40、basic construction and decitex. NOTE. It is recommended that diaphragms should be ozone resistant. Because of the potential interruption of any protective surface coating, such as waxes, by dynamic flexing such methods of protection against ozone attack shall not be used without additional protectiv
41、e additives. 5 Classification Materials shall be classified according to temperature range and hardness as given in table 1 and table 2 respectively. Nm. Seals can be manufactured from materials of class Al to El and A2 to E2, whilst diaphragms are prepared from class Al to B1 and A2 to B2. nble 2.
42、Hardness classes Values in IRHD Class IHl IHZ iH3 1 Nominal 60 to 90 hardness range EXAMPLE: The classification of a rubber material applicable over the temperature range of - 20 ”C to + 80 OC with a declared nominal hardness of 70 IRHD would be B2/H3. 6 Requirements 6.1 General Materials shall be f
43、ree 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 detailed in clause 7, using standard test pieces, the ma
44、terial shall comply with the requirements given in table 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 clause 7, using standard test pieces, the material shall be in accordance with the require
45、ments given in table 4. CEN EN+549 94 I 3404589 00bb09 339 Resistance to gus 2) - change in mass after immersion, ma. - change in mass after drying, max. Page 5 EN 549 : 1994 % % lble 3. Requirements for material used to manufacture seals I Unit Property I IRHD Hardness Tolerance on stated nominal h
46、ardness 7bn.sil.e strength I MPa Elongation at break 1% Compression set - at high temperature i) 1% Resistance to lubricants 3) - change in hardness, max. - change in mass, max. Resistance to ozone 4) Hardness ch H1 f5 25 2 125 I 40 I 40 I 50 f 10 - 40 - 40 + 10 -5 +5 -8 f 10 + 15 - 10 no cracks H2
47、f5 17 L 125 140 540 I 50 f 10 - 40 - 40 + 10 -5 +5 -8 f 10 + 15 - 10 H3 f5 27 L 125 140 I 40 I 50 f 10 - 40 - 40 + 10 -5 +5 -8 f 10 + 15 - 10 i) The test piece shall not be damaged by adhering to the surface of the test apparatus. 2, For silicone material there is no requirement for change in mass a
48、fter immersion as swelling by some such materials may be substantial, the requirement for change in mass after drying, is f 5 X . 3, For silicone material the requirement for change in hardness and mass are f 15 IRHD and *) This requirement is only applicable if the material has been declared by the
49、 manufacturer to be ozone resistant. $ respectively. CEN EN*549 94 E 3404589 0096630 050 Page 6 EN 649 : 1994 %ble 4. Requirements for material used to manufacture diaphragms Property unit Hardness class H1 H2 H3 IRHD f5 f5 f5 Hardness Merance on stated nominal hardness lbnsile strength 27 2 10 MPa % 25 2 500 2 300 2200 Eimgation at break Compression set 1) - at high temperature - at low temperature O OC - at low temperature -20 OC % % % 135 540 150 525 140 I 50 125 I 40 I 50 Resistance to ageing - change in hardness, max. - change in tensile strengt
