1、o . CEN ENs277 93 = 3404589 0032707 O EUROPEAN STANDARD EN 279:1991 NORME EUROPEENNE EUROPAISCHE NORM May 1991 UDC 675.4:620.1:62-762.444:641.534.06 Descriptors: Household appliances, jas appliances, sea?s : c,toppers, rubber pr3ducts, classifications, specifications, characteristics, tests English
2、version Homogeneous rubber materials for dynamic seals in domestic appliances using combustible gases up to 200 mbar Yatriaux a base de caoutchouc homognes pour joints dynamiques dynamische Dichtungen in dtanchit destines aux appareils domestiques utilisant les combustibles 200 mbar gazeux jusqu 200
3、 mbar Homogene Elastomer-Werkstoffe fr Haushaltsgerten fr Brenngase Dis This European Standard was approved by CEN on 1991-05-06 CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standar
4、d without any alteration. Up-to-date lists and bibliographical references concerning such natiuczl standards may be obtained on application to the Central Secretariat or to any CEN member. Thi5 European Standard exists in three official versions (English, French, German). A version in any other lang
5、uage made by translation under the res?onsibi!ity of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN menibers are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Irelan
6、d, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Jweden, 3witzerland and United KinGdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 8-1050 Brussels (cl CEN 1991 Copyright reserved to all
7、 CEN members Ref. No. EN 279:199! E CEN EN*E!79 91 3404589 0012710 7 U ! Page 2 EN 279:1991 , . Contents list Foreword Introduction 1 2 Normative references 3 Definition of dynamic scal 4 Classification of materials 5 Requirements 6 Methods of test Scope and field of application Page 3 4 5 5 5 5 6 7
8、 CEN EN*E79 91 - 3404589 OOL2711 9 W Page 3 EN 279:1991 FOREWORD This document drawn up by MARCOGAZ, AFECI, AEGPL and AFECOGAZ Liaison Committee CL 13 “Lubricant and Sealing Materials“. In accordance with the Common CEN/CENELEC Rules, the following countries are bound to implement this European Stan
9、dard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Iceland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom, European Standard was prepared by CEN/TC 108 on the basicof i CEN ENS279 91 = 3404589 0012712 O Page 4 EN 279:1991 Int
10、roduction This standard defines the quality o materials to be used for the manufacture of seals. It specifies tests to be carried out on specified samples taken from sheet and fixes the test values to be met, It may be necessary to carry out supplementary tests on the seals themselves: - Tests on se
11、als mounted in the appliance. These tests are intended to confirm the functional suitability of the seal and should be performed under the most severe service conditions envisaged in the appropriate standards. - Tests on the seal itself. These tests are intended to confirm that the material from whi
12、ch the seal is manufactured is one that complies with this standard. The fact that most seals are small in size does not, in general, allow for the necessary standard samples for the tests to be prepared from them. The test methods should be chosen from those specified in this standard but the test
13、values will.possibly be different due to the dimensional differences of the sample. CEN EN*1279 91 = 3404589 0012713 2 E 3 4 4.1 Page 5 EN 279:1991 Scope and field of application This European Standard specifies requirements and tests for homogeneous rubbers for dynamic seals used in domestic gas ap
14、pliances of all categories, and in auxiliary equipment mounted or intended to be mounted on such appliances, in contact with combustible gases up to 200 mbar. This standard deals with materials from which are manufactured dynamic seals, such as: - “O“ rings and lip seals - valve pads Note: Rubber ma
15、terials for use in diaphragms are considered in EN 278 Normative references EN 278: 1991 IS0 37:1977 IS0 48:1979 IS0 188:1982 IS0 815:1972 IS0 1653:1975 IS0 1817:1985 IS0 4648:1978 Rubber materials for diaphragms in domestic appliances using combustible gases up to 200 mbar, Rubber, vulcanized - Det
16、ermination of tensile stress-strain properties, Vulcanized rubbers - Determination of hardness. Rubber, vulcanized - Accelerated ageing or heat resistance tests. Vulcanized rubbers - Determination of compression set under constant deflection at normal and high temperature, Vulcanized rubbers - Deter
17、mination of compression set under constant deflection at low temperature. Rubber, vulcanized - Determination of the effect to liquids. Rubber, vulcanized - Determination of dimensions of test pieces and products for test purposes. Definition of dynamic seal In this standard a dynamic seal is a compo
18、nent that ensures a seal between two components which have relative movement. Classification of materials The rubber materials are divided into groups and classes. There are two groups (1 and 2), which are defined by their physical and chemical characteristics (see table 2). - CEN EN*Z79 i3 3404589
19、0032734 4 U . Page 6 EN 279:1991 4.2 There are five classes (A up to E) which are defined by the ranges of envisaged operating temperatures and which determine the test temperature of the stated material. They are detailed in table 1. Table 1 - Classification of material. Group Class temperature O t
20、o 60 O to 80 1 1 1 1;2 I 1;2 I O to 100 O to 125 O to 150 The group and class of the material shall be indicated by the material manufacturer. 5 Requirements 5.1 Visual auality The material shallbe homogeneous, free from porosity, inclusions, blisters and surface imperfections visible to the naked e
21、ye, even after cutting. 5.2 Physical and chemical DroDerties The material shall be in accordance with the requirements laid down in table 2. m CEN EN%279 9L = 3404589 OOL27L5 b Table 2 - Requirements for material Page 7 EN 279:1991 Property Jar dne s s - hardness 40 to 75 - hardness 76 to 84 - hardn
22、ess 85 to 91 to 1 erances rensile strength Elongation at break 2ompression set - at high temperature 2, - at low temperature Xesistance to ageing - change in hardness, max - change in tensile strength, max - change in elongation at break, max ;as resistance - change in mass after immersion, max - ch
23、ange in mass after drying, max Lubricant resistance - change in hardness, max - change in volume, max Unit IRHD IRHD IRHD MPa % % % IRHD % % % % IRHD % :roup 1 It5 f4 It3 27 L 125 5 40 s 40 k 10 40 40 + 10 -5 +5 -8 -r 10 + 15 - 10 Group 2 55 f:4 t3 2 5. 2 125 5 40 s 40 .e 10 40 40 no requi- rement 3
24、 115 i_ 15 + 10 - 10 i) The hardness of the material shall be stated by the manufacturer 2) The sample shall not be damaged by adhering to the surfaces of 3) The swelling after immersion in liquid n-pentane by some group 2 of the seal. the test apparatus. materials may be substantial. I CEN EN*Z79 9
25、3 3404589 O032736 in the event of a disagreement the micro-test shall be used. Five measurements shall be carried out on each sample. Tensile strength and elonnatian at break Test the tensile strength and elongation at break with the method specified in IS0 37 using the following conditions: six dum
26、b-bell test pieces, type 2 is preferred. In the event of a disagreement, type 2 shall be used. Cornmession set Test the compression set at high temperature in accordance with the method specified in IS0 815 using 3 small test pieces, Place the loaded compression apparatus in an oven during (168-2) h
27、 at a temperature related to the class of the material. Test the compression set at low temperature in accordance with the method specified in IS0 1653 using 3 small test pieces. . Place the loaded compression apparatus in a low temperature cabinet during (72- 2) h at (-5 I 1) “C. Resistance to agei
28、ng - Test the accelerated ageing in accordance with the method specified in IS0 188 in a normal oven using 6 dumb-bell test pieces group 2 (see 6.3) and 3 separate test pieces for the hardness test (see 6.2). Place the test pieces in the oven during (168 2) h at a temperature related to the class of
29、 the material. , - CEN EN*Z79 91 D 3404589 0012717 T = Page 9 EN 279:1991 6.6 Resistance to pas Test the resistance to gas in accordance with IS0 1817:1985 clause 8.2. and the following conditions: Use three test pieces each of SO mm x 20 mm x 2 mm weighed. Immerse for (72 n-pentane by mas;, estimat
30、ed by gas chromatography) . After removal from the liquid, dry rapidly by wiping and immediately weigh, Determine the change in mass with reference to the initial mass of the sample. Dry for a period of (168 atmospheric pressure. Determine by weighing of the new change in mass with reference to the
31、initial mass of the sample. For the calculation the arithmetic mean value of the three results both after immersion and after drying is to be used. O) h at (23 k 2)“C in n-pentane (98 % min. 2) h in an oven at (40 f 1) C at 6.7 Resistance to lubricants Test the resistance to lubricants in accordance
32、 with IS0 1817:1985 Volumetric method (8.2) and Hardness test (11.2) and the following special conditions: Use three test pieces each 50 mm x 20 mm x 2 mm. Duration of immersion to be (168 - :) h in oil No 2 with maximum envisaged working temperature corresponding to the material classification acco
33、rdingly to table 1. Determination of the increase in volume and of the change in hardness, .r Page 10 EN 279:1991 CEN EN*Z79 91 3404589 OOI27L8 I W Table 3 - Test methods Proporty ordnorr Tonsilo strongth ond alongation at broak Cmprorrion rot - at high tomporature - at low tomporoturo Resiatanco to
34、 yoing - hardness - tonoilo strmngth and olongotion at brad Gai rorirtonco - iamotoion in a-pontuio - Wing Lubricant rorirtuico - imorrion in of1 nr.2 - so 8 i7 j1S 1653 188 48 37 p;Ui 1817 Qcha:n li.2) . Tost pieces iumb-boll LYP. 2 small type disc 13,s f 0,s rn 6,3 i 0,3 m thicknoss small typo di8
35、c 13,O f 0,s m 6,3 i b,3 m thicknoss dumb-boll tYP. 2 (5OX2OX2) mn (5OX2OX2) mn umbor Test (C) ;rmper atur o 23 t 2 23 i 2 class h: 7Of1 B : 100 t 1 C : 125 i 2 D : 150 t 2 E : 175 t 2 -5 i 1 class A: 70t1 B : 100 t 1 c : 12s i 2 D : 150 t 2 E : 175 i 2 23 t 2 40 t 2 clara A: 50t1 E: 80i1 c : 100 t
36、1 D : 125 t 2 E : 150 t 2 Dur at ion of test (h) O -2 168 O -2 72 O -2 168 O -2 O -2 72 168 O -2 168 ; r , Remarks Hlcro-hardnorr test. is mandatory for reference purposes Final measurement after (30 i 3) min at (-5 f 1) C at the end of the exposure period Normal oven high and dotormine change in mari. Uso the arithmetlc moan valuo, both after imnorsion and drying Dotormine the increase in volume and the change in hardnoss
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