1、CEN PREN*3?92 94 3404589 0073233 456 H Edition approved for publication 1994-09-30 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE C 7 Chairma
2、n M. Bottrell prEN 3792 Edition P 1 September 1994 EDITE PAR L?ASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATERIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. il I 47.36.98.76 UDC : Descriptors : ENGLISH VERSION Aerospace series Anaerobic polymer
3、isable compounds Technical specification Srie arospatiale Composs polymrisables anarobies Spcification technique Luft- und Raumfahrt Anaerobe polymerisierbare Klebstoffe Technische Lieferbedingungen This ?Aerospace Series? Prestandard has been drawn up under the responsibility of AECMA (Association
4、Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this prestandard, the te
5、chnical content shall not be changed to an extent that interchangeability is affected, ph ysically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member count
6、ries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. aecma 1994 - CEN PREN*3772 74 3404589 0073234 392 W Page 3 prEN 3792 : 1994 1 Scope This standard specifies the requirements for a range of one part anaerobic polymerisable compoun
7、ds which polymerises upon the exclusion of oxygen and activation by a metal surface. 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 the text and the publica
8、tions 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 applies. IS0 3104 Petro
9、leum products - Transparent and opaque liquids - Determination of kinematic viscosity and calculation of dynamic viscosity EN 2000 Aerospace series - Quality Assurance EN aerospace products - Approval of the quality system of manufacturers EN 3042 Aerospace series - Quality assurance EN aerospace pr
10、oducts - Qualification procedure EN 3793 Aerospace series - Anaerobic polymerisable compounds - Test method - Determination of static shear strength Aerospace series - Anaerobic polymerisable compounds - Test method - Determination of torque strength EN 3794 EN 3795 Aerospace series - Anaerobic poly
11、merisable compounds - Test method - Determination of excessive cure rate 1) EN 3796 Aerospace series - Anaerobic polymerisable compounds - Test method - Determination of the ability to set on a metal surface ASTM D 21 96 Standard test methods for rheological properties of non-newtonian materials by
12、rotational (brookfield) viscometer 2, 3 Defin it ions For the purposes of this standard, the following definitions apply. 3.1 Activator A substance used in small proportions to increase the reaction rate of chemical systems. 3.2 Anaerobic polymerisable compound A polymerisable composition which poly
13、merisec upon the exclusion of oxygen and activation by a metal su rfa ce. In preparation at the date of publication of this standard 2, Published by : American Society for Testing and Materials (ASTM), 1916 Race Street, Philadelphia, PA 191 03 Previous page is blank CEN PRENx3772 94 I 3404589 Ci0732
14、35 229 I Page 4 prEN 3792 : 1994 3.3 Batch A quantity of homogeneous compound prepared ready for use from the same processing operation with traceability to its individual constituent components. 3.4 Curing Increasing the cohesive strength by chemical change. 3.5 Fluorescence The property of absorbi
15、ng of one wavelength and emitting light of another wavelength. The phenomenon ceases when the source of light is cut off. 3.6 Shear strength The force necessary to bring the cured compound to the point of failure by means of forces applied in a shear mode. 3.7 Thixotropy A decrease of the apparent v
16、iscosity under shear stress followed by a gradual recovery when the stress is removed. The effect is time-dependent. 3.8 Thixotropic index The ratio of the viscosity measured at one shear rate to that at another shear rate. NOTE : The shear rates by convention, differ by a factor of 10 ; this is ach
17、ieved by changing the rotational speed of the viscometer by a factor of 1 O. 3.9 Torque strength The force necessary to rotate a nut on a bolt where engaged threads are coated with cured compound. 3.10 Viscosity The property of a material to resist flow in shear. 4 Requirements 4.1 Composition The c
18、ompounds shall consist essentially of acrylic esters of a polyhydroxy compound. They shall be either of the following : a) generally clear homogenous liquids free from particulate solids ; b) materials containing solids in suspension. 4.2 Colour and visual appearance 4.2.1 colour and free from conta
19、mination and foreign matter. When tested in accordance with annex A, the compounds shall be substantially uniform in CEN PRENx3792 94 M 3409589 007323b 1ib5 W Page 5 prEN 3792 : 1994 4.2.2 accordance with annex B and shall be seen to fluoresce. When fluorescence is a requirement of the material stan
20、dard, the compounds shall be tested in 4.3 viscosity 4.3.1 comply with the material standard. When tested in accordance with IS0 3104 and annex C, the viscosity of the components shall 4.3.2 shall comply with the material standard. When tested in accordance with method B of ASTM-D 21 96 and annex C,
21、 the thixotropic index 4.4 Torque strength 4.4.1 the material standard. When tested in accordance with EN 3794, the torque strength at (23 f 2) “C shall comply with 4.4.2 “C shall comply with the material standard. 4.4.3 comply with the material standard. 4.4.4 comply with the material standard. Whe
22、n tested in accordance with annex D, the torque strength after 1000 h at 100 “C and 150 When tested in accordance with annex E, the torque strength after 168 h in boiling water shall When tested in accordance with annex F, the torque strength after 2 h at (- 55 k 2) “C shall 4.5 Static shear strengt
23、h 4.5.1 with the material standard. When tested in accordance with EN 3793, the static shear strength at (23 + 2) “C shall comply 4.5.2 at 150 “C shall comply with the material standard. When tested in accordance with annex G, the static shear strength afler 1000 h at 100 “C and 4.6 Stability The co
24、mpounds shall remain stable (not polymerise) at 100 “C for a minimum time as stated in the material standard. The stability at 100 “C shall be determined in accordance with annex H of this specification. 4.7 Freedom from excessive cure rate When tested in accordance with EN 3795, the period for whic
25、h the compound is free from excessive cure shall comply with the material standard. 4.8 Ability to set on a zinc surface The compounds shall have the ability to set on a zinc surface within a time as specified in the material standard. The method of determination shall be in accordance with EN 3796.
26、 4.9 Shelf life 4.9.1 life of the compound, measured from the date of dispatch by the manufacturer, shall be at least 12 months. When stored at a temperature of less than 25 “C in the original unopened containers, the shelf 4.9.2 the material standard. At any time during the shelf life, the compound
27、s shall comply with the property requirements of _ CEN PRENt3792 94 m 3404589 0073237 OTL m Page 6 prEN 3792 : 1994 5 Quality assurance 5.1 Manufacturer approval 1 Procedures for manufacturer approval shall be in accordance with EN 2000. 5.2 Product qualification Procedures for product qualification
28、 shall be in accordance with EN 3042. 5.2.1 product(s) qualified shall submit them to a mandated body as designated by AECMA-CERT : In addition to the requirements of EN 3042, the manufacturer or supplier wishing to have his a) Samples of the anaerobic polymerisable compound(s) for which qualificati
29、on is sought. b) Test results for the properties listed in the material standards for the same batch of material from which the submitted samples have been obtained. c) Full instructions for use of the compounds. 5.2.2 the samples provided to the mandated body by the manufacturer. 5.3 Inspection and
30、 test requirements All the tests listed in the specification for which qualification is sought shall be carried out on An anaerobic polymerisable compound shall be tested as applicable in accordance with the requirements given in column Q, table 1, and shall comply with the properties of the materia
31、l standard. 6 Acceptance 6.1 Manufacturing responsibility The manufacturer shall be responsible for the quality and relevant procedures for all inspection and test requirements as specified in 6.3. 6.2 Product acceptance Each batch of material released by the manufacturer shall be deemed to comply w
32、ith this specification and the material standard. 6.3 Inspection and test requirements 6.3.1 Every batch of material shall be inspected and tested to the requirements of column A table 1. 6.3.2 If the sample test fails to meet any of the requirements of the material standard, then two further sample
33、s may be tested from that batch. Both samples shall comply with all the requirements in 6.3.1 before the batch can be released as conforming to the requirements of the material standard. 7 Packaging 7.1 hold an agreed quantity. The compound shall be packed in sound, clean and dry containers which, a
34、fter packing, shall 7.2 solidification of the material during storage. The nature of the container and the ullage after packing shall be such as to prevent premature CEN PRENU3792 94 3404589 0073238 T38 Page 7 prEN 3792 : 1994 8 Marking Each container and its matching carton shall be legibly and dur
35、ably marked with the following details. a) container : - material standard number ; - - batch number. manufacturers name or trade mark ; b) carton: - product description ; - material standard number ; - batch number ; - - - - included. name or trade mark of manufacturer ; dates by which the material
36、 should be used ; manufacturers reference for appropriate accelerator ; where the material contains a suspension instructions for shaking of the container shall be NOTE : Attention is drawn to statutory regulations relating to the marking of anaerobic polymerisable compounds. 9 Certificate of confor
37、mity All material supplied shall be accompanied by a certificate of conformity referring to the appropriate material standard. Page 8 prEN 3792 : 1994 Annex A (normative) Test for colour Place one drop of the compound on clean white paper or a clean glazed white tile and examine it visually in norma
38、l daylight. Annex B (normative) Test for fluorescence B.l Apparatus a) one ultraviolet lamp b) c) one microscope slide one piece of aluminium strip or sheet approx. 5 cm x 2 cm 8.2 Proced u re Apply one or two drops of compound to one end of the aluminium strip and spread over the entire surface usi
39、ng the microscope slide. Illuminate the prepared strip with the ultraviolet lamp. Annex C (normative) Determination of viscosity and thixotropic index c.1 Newtonian compounds C.l.1 accordance with IS0 3104. For newtonian compounds, the viscosity shall be measured in a calibrated U-tube viscometer in
40、 c.2 Non-newtonian compounds C.2.1 For non-newtonian compounds (thixotropic compounds), the viscosity shall be determined by a procedure based on method B of ASTM D 2196 using a Brookfiled Viscometer Model RVT and the small sample adaptor. C.2.2 For compounds with a thixotropic index between 2 and 5
41、, use spindle type SC4-21/3 and for those compounds with a thixotropic index between 6 and 1 O, use spindle type SC4-27/3. C.2.3 The selection of spindle size depends upon the degree of thixotropy to be determined. A rotational speed combination of 2 rpm and 20 rpm shall be used. C.2.4 The viscomete
42、r shall be allowed to run for (10 t 1) min before the measurement C.2.5 The ratio of the viscosity at 2 rpm to that at 20 rpm shall be stated as the thixotropic index. CEN PRENx3792 94 m 3404589 0073240 bb m Page 9 prEN 3792 : 1994 Annex D (normative) Determination of retention of torque strength af
43、ter 1000 h at 1 O0 “C and 150 “C D.1 Apparat us The apparatus shall be as in EN 3794 plus an oven capable of being thermostatically controlled at (100 I 1) OC or (15012) OC. D.2 Proced Ure Prepare six nut and bolt assemblies in accordance with EN 3794 for each test temperature. At the end of the (24
44、 I 1) h period at (23 I 2) OC, remove any surplus uncured compound from the assemblies and place them in the oven at (I00 Ir 1) “C for 1000 h. At the end of this period, remove the assemblies from the oven. Allow to cool at (23 f 2) OC for (2 I %) h and test as in EN 3794. Record the results as in E
45、N 3794 and express the mean value for maximum torque as a percentage of the corresponding value obtained for the unaged specimen in the test at (+ 23 I 2) OC. D.3 Repeat 0.2 with an oven temperature at (150 i 2) “C. Annex E (normative) Determination of retention of torque strength after 168 h in boi
46、ling water E.l Apparat us As in EN 3794 plus suitable apparatus to maintain distilled water boiling under reflux at normal atmospheric pressure for the required period. E.2 Procedure Prepare six nut and bolt assemblies in accordance with EN 3794. At the end of the (24 I 1) h at (23 2) OC, remove any
47、 surplus uncured compound from the assemblies and immerse them in the boiling distilled water for (168 f 2) h. Ensure that the temperature of the boiling distilled water does not fall below 95 “C. At the end of this period remove the assemblies from the water and allow them to cool in air (23 f 2) “
48、C for (2 f %) h. Test the assemblies and record the results in accordance with EN 3794 and express the mean value for maximum torque as a percentage of the corresponding value obtained for the unaged specimen in the test at (23 f 2) OC. CEN PRENs3792 94 3404589 0073243 522 D Page 10 prEN 3792 : 1994
49、 Annex F (normative) Determination of retention of torque strength after 2 h at - 55 “C F.l Apparatus The apparatus shall be as in EN 3794 plus a refrigerator or other suitable means of maintaining the assemblies at (- 55 f2) OC, for (120 f 10) min. F.2 Procedure Prepare six nut and bolt assemblies in accordance with EN 3794. At the end of the (24 f I) h period at (23 _+ 2) OC, remove any surplus uncured compound from the assemblies and place them in the refrigerator at (- 55 f 2) “C for (120 f 10) min. At the end of this period, remove the assemblies form the
