1、AECMA STANDARD NORME AECMA AECMA NORM prEN 4592 Edition P 1 March 2005 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION Gulledelle 94 - B-1200 Brussels - Tel. + 32 2 775 8110 - Fax. + 32 2 775 8111 - www.aecma-stan.orgICS: Descriptors: ENGLISH VERSION Aerospace series
2、Paints and varnishes Test method for determination of infrared reflectance Srie arospatiale Peintures et vernis Mthode dessai pour rflectance infrarouge Luft- und Raumfahrt Anstrichstoffe Prfmethode zur Messung der Infrarotremission This “Aerospace Series“ Prestandard has been drawn up under the res
3、ponsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this P
4、restandard, 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 review by users and formal agreement of AECMA-STAN, it will be submitted as a draft European Standard
5、(prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting
6、with the EN. Edition approved for publication 31 March 2005 Comments should be sent within six months after the date of publication to AECMA-STAN Non-metallic Material Domain Copyright 2005 by AECMA-STAN Page 2 prEN 4592:2005Foreword This standard was reviewed by the Domain Technical Coordinator of
7、AECMA-STANs Non-metallic Material Domain. After inquiries and votes carried out in accordance with the rules of AECMA-STAN defined in AECMA-STANs General Process Manual, this standard has received approval for Publication. Contents Page 1 Scope 3 2 Normative references. 3 3 Terms and definitions 3 4
8、 Principle. 3 5 Apparatus 3 6 Specimen 4 7 Procedure 4 7.1 Operation 4 7.2 Calibration. 4 7.3 Measurement . 5 8 Results 5 9 Designation 5 10 Test report. 5 10.1 Basic information 5 10.2 Supplementary information 6 Page 3 prEN 4592:20051 Scope This standard specifies the method of test for determinin
9、g the infrared reflectance of paints and varnishes. The test procedure determines the amount of energy reflected by the material in the range of wavelengths between 700 nanometres and 2 400 nanometres with respect to that of a standard reflectance material. The procedure is applicable to products in
10、tended for use in aerospace applications. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amend
11、ments) applies. ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling. ISO 1513, Paints and varnishes Examination and preparation of samples for testing. ISO 2808, Paints and varnishes Determination of film thickness. ISO 3270, Paints and varnishes and their raw materials
12、Temperatures and humidities for conditioning and testing. 3 Terms and definitions For the purposes of this document, the following definitions apply. 3.1 infrared reflectance the proportion of the energy reflected by a specimen in relation to a defined standard material 4 Principle The reflectance o
13、f a specimen comprising a coated test panel is measured against that of reflectance standard in the 700 nm to 2 400 nm wavelength range. 5 Apparatus A recording spectrophotometer fitted with an integrating sphere which will meet the following requirements unless otherwise specified or agreed (see Ta
14、ble 1): Page 4 prEN 4592:2005Table 1 Measurement range 700 nm to 2 400 nm minimum Wavelength accuracy 5 nm Measurement accuracy (700 nm to 2 100 nm) 2 % (2 100 nm to 2 400 nm) 8 % Bandpass 4 nm at 700 nm rising to a maximum of 14 nm at 2 400 nm Integrating sphere geometry (reference conditions in ca
15、se of dispute) 10 2/diffuse specular component included A reference material of known reflectance in the range 700 nm to 2 400 nm. 6 Specimen Take a representative sample of the product to be tested or of each component in the case of a multi-coat system as described in ISO 15528. Examine and prepar
16、e the sample for testing as described in ISO 1513. The test panel shall be of a size suitable for the performance of the tests identified by this and the product standard. Coat the test panel with the test product as specified by the product standard. Dry/cure the coating for the time and under the
17、conditions specified in the product standard. The coating thickness, when determined using one of the non destructive procedures specified in ISO 2808 shall comply with the requirements of the product standard. Condition the test panels in accordance with ISO 3270 for a minimum of 16 hours and a max
18、imum of 72 hours prior to testing. 7 Procedure 7.1 Operation Operate the spectrophotometer in accordance with the manufacturers recommendations for environmental conditions, method of operation and calibration if different from that below. 7.2 Calibration Place the reflectance standard over the refe
19、rence port of the integrating sphere. Block the sample beam before it enters the integrating sphere using a suitable device and obtain a 0 % baseline in the specified wavelength range. Note that with some spectrophometers it may be possible to calibrate the baseline so that no correction is necessar
20、y to the sample spectrum. Remove the sample port blocking device and place reflectance standards over both the reference and sample ports and obtain the 100 % baseline in the specified wavelength range. If the absolute reflectance spectrum is required, correct the spectrum to 100 % using the correct
21、ion factors for the reflectance standard used. Page 5 prEN 4592:20057.3 Measurement Replace the sample port reflectance standard with the test panel and record the sample reflectance spectrum over the specified wavelength range. If the absolute reflectance spectrum is required, correct the spectrum
22、using the correction factors for the reflectance standard used. If specified, compare the recorded spectrum with that of the comparison spectrum. 8 Results 9 Designation EXAMPLE Description block Determination of infrared reflectance Identity block EN4592 Number of the standard 10 Test report 10.1 B
23、asic information The test report shall contain at least the following information: a) all details necessary to identify the product tested; b) a reference to this test standard; c) a reference to the product standard; d) the items of supplementary information (10.2); e) the results of the testwork i
24、n terms of the stated requirements; f) any deviation from the test method specified; g) the date(s) of the test; h) name of operator. Page 6 prEN 4592:200510.2 Supplementary information In the performance of this test standard there is a requirement for supplementary information to be provided by th
25、e product standard for the material under test. This information consists of: a) substrate type and method of preparation; b) method of application of the coating including, where applicable, the duration and conditions of drying/curing between coats in the case of multi-coat systems; c) duration an
26、d conditions of drying/curing of the final coat before test; d) thickness of the dry coating or combination of coatings in micrometres; e) the wavelength range to be measured; f) the instrument geometry if different from that defined in this standard; g) the standard reflectance material to use; h) whether the spectrum is to be corrected to absolute reflectance; i) the spectrum that the sample is to be compared to (if required).
