1、AECMA STANDARD prEN 4593 NORME AECMA Edition P 1 AECMA NORM February 2002 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION (AECMA-STAN) Gulledelle 94 - 6-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: Descriptors: ENGLISH VERSION Aerospace series
2、 Non-metallic materials Paints and varnishes Test method Determination of solar absorptance Srie arospatiale Matriaux non-mtalliques Peintures et vernis Mthode dessai Dtermination de labsorption solaire Luft- und Raumfahrt Nichtmetallische Werkstoffe Anstrichstoffe Prfverfahren Bestimmung der Sonnen
3、lichtabsorption This Yerospace Series“ Prestandard has been drawn up under the responsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published on green paper for the needs of fhe European Aerospace Industry, It has been technically approved by the e
4、xperts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, 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 revie
5、w by users and formal agreement of AECMA-STAN it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. - Nota - Extra copies can be supplied by B.N.A.E. - Technopoiis 54 - 199. rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX I I I
6、 Edition approved for publication 1 Comments should be sent within six months after the date nf publication to 2002-02-28 AECMA-STAN Gulledelle 94 6-1200 BRUXELLES Material Domain Mr Pays I I 0 aecma 201 Page 2 prEN 4593: 2002 Blank page Page 3 prEN 4593: 2002 1 Scope This standard specifies the met
7、hod of test for determining the solar absorptance of paints and varnishes. The test procedure determines the amount of energy reflected by the material in the range of wavelengths at which there is energy from the sun hitting the Earths surface, and with the aid of a standard solar spectrum it allow
8、s a calculation to determine the solar absorptance which can then be used to determine the efficiency of solar heat reflecting paints. The procedure is applicable to materials intended for use in aerospace applications. 2 Normative references This European Standard incorporates by dated or undated r
9、eference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incor
10、porated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 15528 IS0 151 3 IS0 2808 IS0 3270 Paints and varnishes and their raw materials - Temperatures and humidities for CIE pub1 No 85 Paints, varnishes and raw materials for paints
11、 and varnishes - Sampling Paints and varnishes - Examination and preparation of samples for testing Paints and varnishes - Determination of film thickness conditioning and testing Solar spectral irradiance 3 Terms and definitions For the purposes of this standard, the following definition apply : 3.
12、1 solar absorptance the proportion of the energy emitted by the sun which hits the Earths surface which is absorbed by the material under test 4 Principle The reflectance of specimens, comprising of coated test panels is measured and summated over the range of solar energy which hits the Earths surf
13、ace through two air masses, allows the calculation of solar absorptance. Page 4 prEN 4593: 2002 5 Apparatus A recording spectrophotometer fitted with an integrating sphere which has the specular component included, a 1O0/diffuse measuring geometry and is capable of meeting the following requirements
14、. Measuring range 300 nm to 2300 nm Wavelength accuracy f5nm Bandpasc 4 nm Replace (23 +_ 2) “C and (50 f 5) % RH with IS0 3270, where applicable. Measuring accuracy *2% 6 Specimens Take a representative sample of the material to be tested or of each component in the case of a multi-coat system as d
15、escribed in IS0 15528. Examine and prepare each sample for testing as described in IS0 151 3. The test panels shall be of a size suitable for the performance of the tests identified by this and the material standard. Coat the test panels with the test material as specified by the material standard.
16、Dryhure the coating for the time and under the conditions specified in the material standard. I rie coating thickness, wnen aeiermined using one of the non destructive procedures specified in IS0 2808 shall comply with the requirements of the material standard. Condition the test panels at a tempera
17、ture and at a relative humidity defined in IS0 3270 for a minimum of 16 hours and a maximum of 72 hours prior to testing. TI. . 7 Procedu re Measure and record the reflectance spectrum using the reflectance grade barium sulphate as the reflectance standard on the spectrophotometer in the wavelength
18、range 300 nm to 2 300 nm. 8 Calculation Unless specified, use the solar spectral irradiance data (CIE pub1 No 85) through 2 air masses, 0,2 nm optical depth at 50 nm, 0,3 cm ozone and 2,O cm precipitable water. Calculate the solar absorptance using the following equation: where: a(s) = Solar absorpt
19、ance R, = Measured reflectance of paint (%) EA = Solar irradiance (W/m2) Page 5 prEN 4593: 2002 Description block DETERMINATION OF SOLAR ABSORPTANCE 9 Supplementary information Identity block In the performance of this test standard there is a requirement for supplementary information to be provided
20、 by the material standard for the material under test. This information consists of: a) b) c) d) e) 9 substrate type and method of preparation; method of application of the coating including, where applicable, the duration and conditions of dryingkuring between coats in the case of multi-coat system
21、s; duration and conditions of drying/curing of the final coat before test; thickness of the dry coating or combination of coatings in micrometres; properties of the coating to be evaluated following exposure; number of air masses to employ for standard solar spectrum. IO Test report The test report
22、shall contain at least the following information: a) all details necessary to identify the material tested; b) a reference to this test standard; c) a reference to the material standard; d) the items of supplementary information (sect IO); e) the results of the testwork in terms of the stated requirements; 9 any deviation from the test method specified; g) the date(s) of the test; h) name of the operator. 11 Designation EXAMPLE: Number of this standard 1
