1、AECMA PREN*3bLb 91 M 10L23Ll 0007250 3 A. E. C. M. A, STAN DAR D NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 3616 Issue P 1 August 1991 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cdex -Tl. (1 ) 47.36.98.
2、76 UDC : Key words : ENGLISH VERSION Aerospace series Fibre reinforced plastics Test method for the determinalnon of moisture content by means of moisture evolution analyser (MEA) Srie arospatiale Plastiques renforcs de fibres Mthode dessai pour ia dtermination du taux dhumidit par lanalyseur de dga
3、gement dhumidit (MEA) Luft- und Raumfahrt Faserverstrkte Kunststoffe Prfverfahren zur Ermittlung des Feuchtegehaltes mittels Feuchtigkeitsanalysator (MEA) This 1,f or 0,9 should result, the electrolytic cell is to be regenerated in accordaice with the maufacturers instructions AECMA PREN*IbLb 91 rai
4、 LOL23Ll 0007254 O E prEN 3616 Page 5 5.4 Material analysis 5.4.1 Preparation of the specimen Because of the big difference in surface area of the specimen compared to its weight in this MEA method, external influences may have large effects on the moisture content measured on this specimen. The fol
5、lov.4ng points shall be observed : - Avoid heat development and water contact when cutting-out the specimen. - Expose the cut-out specimen to the laboratory environment for the shortest possible time only. - Do not touch the specimen with your bare hands. In the case of thick components, the small s
6、pecimen weights have the advantage of allowing to obtain a moisture content representative of the laminate or component, sampling shall be done at various selected locations, - with respect e0 the sample si=, different raidfibre distribution my influence the restilt. Por the above reasons, at least
7、two malyses shoald be mde third masiirement is necessary. in the case of large differences ira sadk a The selected dnying temperahire of 190 OC causes all the water bonded iii the material via auxiliary valence forces (Van Ber Waals and dipole forces, as well as hydrogen bonding) to scape. Water rac
8、td-in by main CO-valent bonding will probably not be set free by this process. However, it is not expected that materials comnonly hvestigated by this method show such bonding. 7 %Ht report The test report shall refer to this standard. It shall also rword : 7. i 7.2 agent, etc. Complete identificati
9、on of the material or product tested including batch number. The type of specimen tested, method of preparation, dimensions, surface finish, peel ply, release 7.3 The temperatiire to which the specimens were subjected. 7.4 The curve of moisture loss. 7.5 Changes in visual aspect. 7.6 Ali incidents likely to have affected the results and any deviation from this standard.
