1、STD=AECMA PREN 3207-ENGL L77b 10L2311 0012b75 177 AECMA STANDARD NORME AECMA AECMA NORM prEN 3207 Edition 1 July 1996 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 E1 1 O - Fax. (32) 2 775 EI 11 ICs : 49.040.1 O Descriptors :
2、 Srie arospatiale Matriaux caoutchouc Spcification technique ENGLISH VERSION Aerospace series Rubber compounds Technical specification Luft- und Raumfahrt Kautschu kmischungen Technische Lieferbedingungen This “Aerospace series“ Standard has been drawn up under the responsibility of AECMA (The Europ
3、ean Association of Aerospace Industries). It is published on yell0 w paper in three equivalent versions (English, French, German). It will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Edition aDDrOVed I The eauivalent versions in French a
4、nd German lanauaaec I - can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau I 921 38 ISSY - LES - MOULINEAUX CEDEX - FRANCE for publication 1996-07-1 2 aecma 1996 STD*AECMA PREN 3207-ENGL L77b LOL231L 0012b9b 023 Page 3 prEN 3207 : 1996 1 Scope This standard specifies the r
5、equirements for the qualification and batch acceptance of rubber compounds intended for the manufacture of aerospace parts. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropr
6、iate 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 publicat
7、ion referred to applies. IS0 34-1 IS0 37 IS0 48 IS0 188 IS0 471 IS0 815 IS0 1431-1 IS0 1817 IS0 1826 IS0 2781 IS0 2921 IS0 3387 IS0 6505 IS0 9002 EN 2000 EN 2899 EN 3042 EN 10204 Rubber, vulcanized - Determination of tear strength (trouser, angle and crescent test pieces) Rubber, vulcanized or therm
8、oplastic - Determination of tensile stress-strain properties Rubber, vulcanized or thermoplastic - Determination of hardness (Hardness between 10 IRHD and 100 IRHD) Rubber, vulcanized - Accelerated ageing or heat-resistance tests Rubber - Standard temperatures, humidities and times for the condition
9、ing and testing of test pieces Rubber, vulcanized or thermoplastic - Determination of compression set at ambient, elevated or low temperatures Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Part 1 - Static strain test Rubber, vulcanized - Determination of the effect of liquids
10、Rubber, vulcanized - Time-interval between vulcanization and testing - Specification Rubber, vulcanized - Determination of density Rubber, vulcanized - Determination of low temperature characteristics - Temperature- retraction procedure (TR test) Rubbers - Determination of crystallisation effects by
11、 hardness measurements Rubber, vulcanized - Determination of adhesion to, and corrosion of, metals Quality systems - Model for quality assurance in production, installation and servicing Aerospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers Ae
12、rospace series - Vulcanized rubbers - Tests on the susceptibility to corrosion of metals in contact with vulcanized rubbers in a damp atmosphere Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Metallic products - Types of inspection documents 1) In preparation
13、at the date of publication of this standard Previous page is blank - STD=AECMA PREN 3207-ENGL Lb LOL23Ll 00L2b7 TbT m Page 4 prEN 3207 : 1996 3 Definitions For the purposes of this standard, the following definitions apply : 3. i Rubber compound A rubber compound is a homogeneous mixture of all the
14、constituents of a rubber formulation, e.g. rubber gumstock, curing agents, accelerators, fillers. 3.2 Batch of rubber compound A batch of rubber compound shall be rubber compound of definite composition which shall be identifiable, traceable and manufactured in a single production operation. 3.3 Est
15、ablished manufacturer An established manufacturer is a manufacturer who has manufactured products for the aerospace industry for a number of years to recognized national or company aerospace specifications. This manufacturer shall have an approval in accordance with EN 2000 or IS0 9002 or other nati
16、onal or company standards issued by an authorized aerospace company. 3.4 Established rubber compound An established rubber compound is a rubber compound produced by an established manufacturer to an existing national or company aerospace specification which is accepted as an alternative to the EN ma
17、terial standard. 3.5 New manufacturer A new manufacturer is a manufacturer who has not previously manufactured rubber compounds for the aerospace industry and which has no approval from an authorized aerospace company. This manufacturer shall be approved in accordance with EN 2000. 3.6 New rubber co
18、mpound A new rubber compound is a rubber compound produced by a specific manufacturer, but which has never been qualified by this manufacturer against an existing national or company aerospace specification which is accepted as an alternative to the EN material standard. A new rubber compound shall
19、be qualified in accordance with EN 3042 and this standard. 4 Requirements 4.1 Constituents The manufacturer of the rubber compound shall be responsible for the quality of the constituents of the mixture. STD-AECMA PREN 3207-ENGL 179b LOLZ3LL 0032b98 9Tb M Page 5 prEN 3207 : 1996 4.2 Mixing process T
20、he manufacturer of the rubber compound shall prepare and comply with a comprehensive mixing process instruction schedule. The reproducibility of the process shall be assured. 4.3 Test pieces Test pieces shall be prepared from vulcanized sheets of appropriate sizes and thicknesses. Where necessary, t
21、est pieces may be moulded in a separate operation. Details of the vulcanization conditions shall be given for all test pieces. 4.4 Conditioning and testing The time interval between vulcanization and testing shall comply with IS0 1826. The conditioning and testing of the test pieces shall comply wit
22、h IS0 471 at (23 - batch number ; - date of production ; - number of certificate. - STD=AECMA PREN 3207-ENGL L79b LOL23LL 0012700 384 M Pagc i prEN 3207 : I996 1 2 3 4 Density 5 Tensile strength I IS0 37 - Type 2 test pieces 6 7 8 9 10 11 Tear strength IS0 34-1 - Method C Elongation at break Modulus
23、 at % strain IS0 37 - Type 2 test pieces IS0 37 - Type 2 test pieces r 15 16 Compression set IS0 815 Table 1 - Test methods Test methods number of test pieces standard Properties lualificatior Acceptance 1 IS0 48 8 mm thick test pieces which may be made by superposing a thickness of 2 mm and of 6 mm
24、. The 6 mm thick sheet shall absorb the pressure from the indenter. Hardness 3 IS0 2781 3 -5 I 5 5 5 5 12 I IS0 2921 TR test specimen with length = 100 mm initial elongation = 50 % Resistance to low temperatures TRI O 3 13 3 Ozone resistance I IS0 1431-1 Method A 3 IS0 6505 Corrosion and adhesion on
25、 metals in a dry atmosphere 19 3 EN 2899 - A Corrosion and adhesion on metals in a damr, 3 3 t EN 2899 - B atmosphere 20.2 Page 8 prEN 3207 : 1996 Material standard line number 1 2 Table 2 - Tests after exposure to test media Min. Qualification Acceptance Properties Test methods number of test piece
26、s Test on standard test pieces - unless otherwise specified - after immersion in fluids according to IS0 181 7 or after accelerated temperature ageing according to IS0 188 3 4 5 6 7 Permissible variation of the properties compared to the initial valuc Volume Mass Tensile strength Elongation at break
27、 Hardness I3 IS0 1817 Test pieces (50 x 25 x 2)mm l3 l5 t- IS0 37 - Type 2 test pieces Using a 4 mm specimen consisting of two 2 mm sheets 3 3 5 5 3 STD-AECMA PREN 3207-ENGL 199b 1012313 0032702 157 Page 9 prEN 3207 : 1996 Annex A (informative) EXAMPLE : Certificate 3.1 .B (see EN 10204) for rubber
28、compounds User . Order No. . Material standard reference Qualification testing and batch control EN 3207 Manufacturers name and address Manufacturers material designation Quantity supplied . Year of manufacture . Quarter Production batch No. Delivery note No. . Dispatch date No. of certificate . Rem
29、arks Properties Density Hardness Tensile strencith Elongation at break Compression set after . h at . OC Variation in volume after immersion in . after h at OC Units Mg/m3 IRHD MPa % % % Test methods according to IS0 2781 IS0 48 8 mm thick test pieces which may be made by superposing a thickness of
30、2 mm and of 6 mm. The 6 mm thick sheet shall absorb the pressure from the indenter. IS0 37 test piece Type 2 IS0 815 IS0 1817 Test piece (50 x 25 x 2)mm Specified values as per material standard Value from woduction batch This is to certify that the properties of the rubber compound from the above production batch comply with the requirements of the material standard. (Signature of the Quality Assurance Manager) . (Place and date) (Company and Department stamp)
