1、A. E .C .M .A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM Approved by COMITE DE NORMALISATION of A.E C.M.A. 1982-09-1 5 prEN2330 Edition 1 February 1983 _ -I The equivalent versions in French and German languages can be supplied by B.N.A.E., 8, rue Moreau-Vauthier 92100 BOULOGNE-BILLANCOURT -.FRANCE
2、. ENGLISH VERSION TEST METHOD FOR THE DETERMINATION OF THE PERCENTAGE OF VOLATILE MATTER IN WOVEN TEXTILE GLASS FIBRE FABRIC PREIMPREGNATE AEROSPACE SERIES METHODE DESSAI POUR LA DETERMINATION DU POURCENTAGE DE MATIRES VOLATILES DANS LES TISSUS DE VERRE TEXTILE PREIMPREGN SERIE AEROSPATIALE LUFT- UN
3、D RAUMFAHRT PRFVERFAHREN ZUR BESTIMMUNG DES ANTEILS AN FLCHTIGEN BESTANDTEILEN IN VO R IMPRGNI E RTEM G LASFI LAMENTG EWEBE This industrial standard for the aerospace sector has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). it is pub
4、lished on yellow paper in three equivalent versions (English, French, German). It will be submitted to CEN (European Committee for Standardization) as a draft European Standard. AECMA PREN2330 83 LOL23LL 0002923 3 prEN2330 Page 2 1 2 3 4 5 6 7 8 9 10 CONTENTS SCOPE AND FIELD OF APPLICATION REFERENCE
5、S DEFINITIONS PRINCIPLE OF THE METHOD APPARATUS STANDARD ATMOSPHERE FOR CONDITIONING AND TESTING SAMPLING PROCEDURE CALCULATION AND EXPRESSION OF RESULTS TEST REPORT 1 4 5 AECMA PREN2330 83 10L231L 000292q 5 m SCOPE AND FIELD OF APPLICATION prEN2330 Page .3 A.E.C.M.A. STANDARD pr E N2330 TEST METHOD
6、 FOR THE DETERMINATION OF THE PERCENTAGE OF VOLATILE MATTER IN WOVEN TEXTILE GLASS FIERE FABRIC PREIMPREGNATE This standard specifies a method for determining the percentage of volatile matter in a woven textile glass fibre fabric preimpregnate, for aerospace use. REFERENCES EN62, Glass reinforced p
7、lastics - Standard atmospheres for conditioning and testing. DEFINITIONS A woven textile glass fibre fabric preimpregnate with a thermosetting resin is a material that can be purchased in the form of a synthetic resin impregnate woven textile glass fibre fabric and used for the manufacture of moulde
8、d components. PRINCIPLE OF THE METHOD Determination of difference in mass by means of weighing before and after conditioning at an elevated temperature for a specified time, expressed as percentage of volatile matter with respect to the initial mass. APPARATUS 5.1 Balance with an accuracy of 1 mg. 5
9、.2 Metal template of specimen. 5.3 Ancillary items such as sharp cutting knife and tweezers. 5.4 Tray of suitable material and form, e.g. corrugated metal foil, if necessary to prevent the loss of any resin that may drip from the specimen while it is being heated. - AECMA PREN2330 83 m LOL23LL 00029
10、25 7 U prEN2330 Page 4 5.5 Oven capable of maintaining the temperature with an accuracy of 1 5OC and provided with a fan for circulating the air. 5.6 Desiccator, containing a suitable drying agent (for example, silica gel, calcium chloride, phosphorus pentoxide). 6 STANDARD ATMOSPHERE FOR CONDITIONI
11、NG AND TESTING 6.1 Conditioning 6.1.1 Material stored at ambient temperature Unless otherwise specified, the necessary amount of material (see clause 7) shall be sampled and conditioned in the standard testing atmosphere (see clause 6.2.1) for a minimum bf 2 h. 6.1.2 Material stored below ambient te
12、mperature The material, suitably packed in an air-tight and solvent resistant bag to prevent moisture pick-up, shall be allowed to reach ambient temperature over a period of time according to the mass of the package. This time shall not be less than 8 h and the actual time shall be recorded in the r
13、eport. When the material has reached the ambient temperature, the necessary amount (see clause 7) shall be sampled and conditioned in the standard testing atmosphere (see clause 6.2.1), for a . minimum of 2 h, unless otherwise specified. .- 6.2 Testing 6.2.1 Standard atmosphere for testing The stand
14、ard atmosphere shall be in accordance with standard e EN62, that is to say that the tests shall be carried out at 23 ;t 2OC and (50 - + 5) % relative humidity. 6.2.2 Time interval between conditioning and testing After conditioning, the test shall be carried out within 6 h, unless otherwise specifie
15、d, the specimen being kept in the standard atmosphere until the test is carried out. 7 SAMPLING 7.1 Test specimen I The specimen shall have a length of 100 $: 1 mm and a width of 100 2 1 mm. Other dimensions of the test specimen may be used subject to agreement between the purchaser and supplier, bu
16、t having a surface area of 3.00 cm2 with an accuracy of +. 2%. AECMA PREN2330 83 I LOL2311i 000292b 9 W I prEN2330 Page 5 11 -_ 7.2 Number and distribution of tes; specimens I I Five test specimens shall be used. These shall be evenly distributed over the width and cut from the sample diagonally (85
17、) either across the width or along an axis inclined at an angle as close as possible to the weft direction. The specimens shall not be closer than 50 mm to the edges and selvedges (see figures 1 and 2). Dimensions in millimetres 50 min. I I - 50 min. 50 min. - 50min. t Warp yarns direction -, Width
18、of woven textile glass fabric FIGURE 1 - Example of diagonal positioning of test specimens on woven textile glas fabric sample across the width Dimensions in millimetres FIGURE 2 - Example of diagonal positioning of test specimens on woven textile glass fabric sample along an axis inclined at an ang
19、le 1 as clos$ as DossibletaIhersrPfIdirgction -_ - AECMA PREN2330 83- LOL23Ll 0002927 O W B“ prEN2330 Page 6 8 PROCEDURE Cut five specimens from a conditioned sample in accordance with clause 6.1, using the appropriate template (see clause 5.2). Remove the separating film and weigh each specimen to
20、the nearest mg, if necessary with a weighed tray (see clause 5.4). Transfer the specimens (with tray, if used) to an oven maintained at the specified temperature. Take care that the specimens are well ventilated by the hot air in the oven. After the specified time, remove the specimens (and tray, if
21、 used) from the oven, cool down to ambient temperature in a desicca,tor and weigh to the nearest mg. NOTE : Oven temperature and time are those as specified in the relevant material standard, according to resin type. 9 CALCULATION AND EXPRESSION OF RESULTS The percentage of volatile matter in each t
22、est specimen is calculated from the formula : (ml - m2) P= x 100 if no tray is used ml or : (ml - 9) (ml - m3) P= x 100 if a tray is used where : P = the content of volatile matter expressed as a percentage of the original mass, ml = the initial mass of the specimen (and tray, if used), in g, m2 = t
23、he mass of the specimen (and tray, if used), in g, after heating , m3 = Calculate the arithmetic mean of the values obtained for P. the mass of the tray (if used), in g. prEN2330 Page 7 I I 10 TEST REPORT The test report shall include the following information : 10.1 Number of this standard, 10.2 Re
24、ference to the type of preimpregnate, with complete descr ipti on 10.3 Dimensions of specimens, if these differ from clause 7.1) 10.4 The actual time used for the preconditioning, 10.5 The temperature used and the time in the oven, 10.6 The individual mass values, 10.7 The arithmetic mean value of the content of volatile matter, expressed as a percentage of the original mass, 10.8 Observations on any circumstances liable to influence the results.
