1、A. E.C. M .A. STANDARD NORME A.E.C.M.A. A.E.C.M,A. NORM prEN 2667 Part 6 Issue P i April 1989 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TEL. 45-63-82-85 UDC : Key words : ENGLISH VERSION Aerospace series Test method for the determi
2、nation of water absorption of structural foam film adhesives Srie arospatiale Luft- und Raumfahrt Mthode dessai pour la dtermination structuraux en films expansibles Prfverfahren zur Bestimmung strukturellen Expansionsklebstoffen de labsorption deau des adhsifs . der Wasseraufnahme von This Aerospac
3、e Series) pre-standard has been drawn up under the responsibility of AECMA (Association Europenne es Constructeurs de Matriel Arospatial). .It is published on green paper for the needs of AECMA-Members. It has been technically approved b y the experts of the concerned AECMA Commission following comm
4、ent by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard C
5、hecking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for final vote. Nota - Extra copies can be supplied by B.N.A.E. - 8, rue Moreau-Vauthier - 92100BOULOGNE-BILLAN
6、COURT Edition approved for publication Comments should be sent within six months .G7 Ghairrnan after the date of publication decision A.E.C.M.A. 88, Bd. Malesherbes Mr BEZAUD 25th April 1989 75008 PARIS - FRANCE aecma 1989 COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicens
7、ed by Information Handling Services _ _ - .- 1 Issue P I prEN 2667-6 Page 2 AECMA PREN2bb7 A E LOL2333 0003Ab0 T Contents Scope and field of application References Principl-e of the method Ap parat us Test pieces Conditioning Test procedure Calculation of results Test report COPYRIGHT Association Eu
8、ropeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesAECMA PREN2bb7 A LOL23L& O03AhL JI- f Issue P 1 prEN 2667-6 Page 3 1 Scope and field of application This standard specifies a method for determining the water absorption of structural foam film adhesives with a c
9、uring temperature of 125C or greater when exposed to high humidity or when immersed in water. 2 References EN 2667-3 Aerospace series - Foaming structural adhesives - Tests to determine the expansion ratio and the volatile substance ratio 1) 3 Principle of the method Weighing of test pieces before a
10、nd after exposure in a specified environment, 4 Apparatus 4.1 Balance with an accuracy of 1 mg. 4.2 Oven, capable of maintaining a temperature of (110 - + 3)“C and of (50 - + 3)“C, 4 :3 Humidity cabinet, capable of maintaining a uniform temperature of (50 - + 3)“C and a relative humidity of 95 - 100
11、%. 4.4 Container with distilled water. 4.5 Desiccator. 4.6 Ancillary items, polyvinylfluoric-foil, such as sharp knives, metal templates, polyester metal backing material, measuring devices, sand paper. 1) In preparation or COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicen
12、sed by Information Handling ServicesIssue P 1 prEN 2667-6 Page 4 5 Test pieces 5.1 test samples as per EN 2667-3 (see figure 1). Test pieces of cured foam film adhesive are sawn from cured and expanded Figure 1 - Test piece for water absorption determination Wote : If specimens of EM 2667-3 are to b
13、e used for making test pieces for the determination of water absorption then a release film is to be used between the foam film adhesive and the backing material. 5.2 The test pieces shall be in the form of a square 50 mm in length by 50 mm in width by the thickness of the material. 5.3 The dimensio
14、ns shall be measured to an accuracy of 2 0,2 mm. Note : The thickness of the test piece shall be considered the average of four corner-measurements taken. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesI AECMA PREN2667 89 1012311 00038
15、63 5 W Issue P 1 prEN 2667-6 Page 5 5.4 The test pieces shall be machined from the samples so as to have smooth edges free from cracks. The cut edges shall be made smooth by finishing with sand-paper or emery cloth or by routering. 5.5 The number of test pieces per test configuration shall be 3. 6 C
16、onditioning 6.1 Weigh the test pieces individully (weight Mli = original weight: all weight measurements in mg). 6.2 The test pieces shall be conditioned for 24 h in an oven at a temperature of (110 + 3) OC, cooled in a desiccator and immediately reweighed (weight M2i = conditioned weight). 7 Test p
17、rocedure 7.1 This standard describes two test procedures for determination of the water absorption of foam film adhesives. 7.2 14 days immersion Completely immerse the test pieces in a container of distilled water maintained at a temperature of (25 + 3)OC. At the end of the 14 days immersion, remove
18、 the test pieces from the warer, dip thein in absolute alcohol, dry them for on minute in an oven at a temperature of (50 5 3)C, cool them in a desiccator an immediately reweigh (weight M = wet weight), 7.3 14 days humidity Expose the test pieces in a humidity cabinet for 14 days to air of (50 + 3)G
19、 and controlled relative humidity of 95% - 100%. At the end of the 14 day exposure, remove the test pieces from the humidity cabinet, cool them in desiccator and immediately reweigh (weight M = wet weight). 7.4 Reconditioning 3i 31 Recondition the immersion or humidity exposed test pieces as per par
20、agraph 6,i then cool them in a desiccator and immediately reweigh (weight l4 reconditioned weight). 41 Note 1 : If the reconditioned weight is lower than the conditioned weight, tt difference shall be considered as water soluble matter lost during the test. I this case the water absorption value sha
21、ll be the sum of the weight increas during the test and the weight of the water soluble matter (see paragraphs 8. and 8.7). Note 2 : If the reconditioned weight is not lower than the conditioned weight then the foam material is to be considered having no water soluble matter. COPYRIGHT Association E
22、uropeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services1 - I AECMAPRENZbb7 89 m LO123LL 00038b4 7 m Issue P 1 prEN 2667-6 Page 6 8 Calculation of results 8.1 Percentage weight loss on initial drying, calculated as follows on the basis of original and conditioned wei
23、ght : Mii M2i Mli Weight loss, X = 8.2 Pereentage weight increase during test, calculated as follows : x 100 M3i - M2i M2i Weight increase, % = 8.3 Actual weight increase during test, expressed in mg of water per cm3 of test piece, calculated as follows : Weight increase, mg/cm3 = M3i - M2i where V
24、. = original volume of test piece in cm3, calculated with the results of paragrabfis 5.2 and 5.3. 8.4 Percentage of soluble matter lost during test, calculated as follows : x 100 M2i - M4i Soluble matter lost, % = M2i Note : see also paragraph 7.4, note 2. 8.5 of test piece, calculated as follows :
25、Weight of soluble matter lost during test, expressed in mg of water per cm3 %i - M4i Soluble matter lost, mg/cm3 = Note : see also paragraph 7.4, note 2. 8.6 Percentage water absorption during test is the sum of the values in 8.2 and 8.4. 8.7 The weight of the water absorption per cm3 during test is
26、 the sum of the values in 8.3 and 8.5. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services AECMA PREN2bb7 87- I LOL23LL 0003865 9 d issue P 1 prEN 2667-6 Page 7 9 Test report . D 9.1 The report shall include the following information for e
27、ach test piece and the average for the three test pieces. 9.1.1 Complete information indicating the nature of the material tested and the manufacturers material number, batch number, date of manufacture, and date of test, storage conditions, cure conditions and expanclon rate according to EN 2667-3.
28、 9.1.2 The dimensions of the test piece before conditioning, measured to the nearest 2 0,2 nim. 9.1.3 9.1.4 Percentage of water absorption during test and its components of percentage weight loss and percentage soluble matter loss during test, 9.1.5 weight increase and weight of soluble matter lost
29、per cm3 during test. 9*1.6 Any observations of the test pieces such as cracking or change n appearance. 9,1.7 Any deviation of this standard. Complete description of the test condition and test procedure. Weight of water absorption per cm during test and its components of Q COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services
