1、BRITISH STANDARD AEROSPACE SERIES Non-metallic materials - Structural adhesives - Test methods - Determination of the primer thickness The European Standard EN 2781:1998 has the status of a British standard ICs 49.025.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 27
2、81:1998 - STD-BSI BS EN 2783-ENGL 3998 W 3b2ilbb9 0723255 T37 BS EN 2781:1998 National foreword This British Standard is the English language version of EN 2781: 1998. The UK participation in its preparation was entrusted to Technical Committee ACW63, Aerospace sb-uctural adhesives, which has the re
3、sponsibility to: - aid enquirers to understand the text; - present to the responsible inte - embedded in a synthetic resin compound according to a procedure adapted to the material avoiding any reaction with the primer and ensuring a sufficient contrast to it; - ground and polished until any distort
4、ion or damage to the primer due to sampling has been eliminated. The direction of grinding shall be from the primer to the base material. 5.4 Measurement The thickness shall be measured with a magnification of at least 500 times by means of an optical microscope using incident light, the cross secti
5、on surface being perpendicular to the optical axis. The ocular micrometer shall be calibrated before measurement. The calibration factor shall be recorded. Five measurements shall be made at various points of the cross section. 5.5 Assessment The primer thickness corresponds to the arithmetical mean
6、 of the five measurements. 5.6 Test report It shall include the following: - designation of the method: EN 2781A, - designation of the primer; - identification of the test pieces, .e. number and position on the component; - position of the five measurement points; - calibration factor of the ocular
7、micrometer; - thickness in micrometers (individual values and the mean value); - deviations from this standard. Page 5 EN 2781 :1998 6 Method B 6.1 Principle Determination of the average thickness based on the ratio: mass per unit area/density of the primer. 6.2 Apparatus Balance with a sufficient a
8、ccuracy to meet the requirements of 6.3. 6.3 Measurements The coating surface of the test panel shall be measured to 1 mmz. The mass of the test panel shall be determined to 0,001 g before applying the primer and immediately after curing. 6.4 Calculation of thickness The average thickness is calcula
9、ted as follows: where: S G Go F Y is the average primer thickness, in micrometres; is the mass of test panel with cured primer, in grams; is the mass of test panel before application of primer, in grams; is the coating surface, in square millimetres; is the density of cured primer, in grams per cubi
10、c centimetre. 6.5 Test report It shall include the following: - designation of the method: EN 27818; - designation of primer; - density of cured primer; - identification of the test panel; - calculated average primer thickness; - deviations from this standard. STD-ES1 ES EN 2781-ENGL 1998 162Ybb9 07
11、212bL 230 Page 6 EN 2781:1998 7 Method C 7.1 Principle See IS0 2360. 7.2 Definitions See IS0 2360 and IS0 2064. 7.3 Apparatus See IS0 2360. 7.4 Factors affecting the measurement See IS0 2360. 7.5 Adjustment See IS0 2360. 7.6 Determining the primer thickness See IS0 2360. 7.7 Assessment For every ref
12、erence area, the local primer thickness is the arithmetical mean of three individual measurements. The thickness on the significant surface of the measured object is the arithmetical mean of local thicknesses. 7.8 Test report It shall include the following: - designation of the method: EN 2781C; - d
13、esignation of primer; - type and designation of the measured object; - measurement equipment or installations; - test conditions; - type of adjustment, and type of reference test piece; - position of the significant surfaces; - position and number of the selected reference areas; - individual values
14、 of the thickness measured on the reference areas, local thicknesses; - calculated mean value for the significant surface; - deviations from this standard. BS EN 2781:1998 BSI 389 Chiswick High Road London w4 4AL - STD-BSI BS EN 2783-ENGL 1998 D 1624bb9 0723262 377 D BSI - British Standards Institut
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