1、July 2009Translation by DIN-Sprachendienst.English price group 6No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 17.
2、180.20!%)T“2064956www.din.deDDIN 6175-1Tolerances for automotive paints Part 1: Uni paints,English translation of DIN 6175-1:2009-07Farbtoleranzen fr Automobillackierungen Teil 1: Unilackierungen,Englische bersetzung von DIN 6175-1:2009-07Tolrances de couleurs pour peintures automobiles Partie 1: Pe
3、intures unies,Traduction anglaise de DIN 6175-1:2009-07SupersedesDIN 6175-1:1986-07www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 8 pages12.13 DIN 6175-1:2009-07 2 A comma is used as the decimal marker. Contents Page Foreword . 3 Intro
4、duction 4 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 6 4 Colorimetry 7 5 Colour tolerances . 7 5.1 Supply of paints 7 5.2 Paint finish . 7 5.3 Repair finish 7 Bibliography . 8 DIN 6175-1:2009-07 3 Foreword This document has been prepared by Working Committee NA 025-00-24 AA Far
5、btoleranzen in der Kfz-Lackierung of the Normenausschuss Farbe (FNF) (Colour Standards Committee). It replaces the current edition of this standard DIN 6175-1:1986-07. DIN 6175, Tolerances for automotive paints consists of: Part 1: Uni paints Part 2: Goniochromatic paints Amendments This standard di
6、ffers from DIN 6175-1:1986-07 as follows: a) The standard has been updated and its content and form revised, also to be in line with the applicable design rules; b) The CIELAB colour space and the DIN99 formula according to DIN 6176 have been taken into account. Previous editions DIN 6175-1: 1986-07
7、 DIN 6175-1:2009-07 4 Introduction Explanatory remarks on the previous edition (1986-07) The costs of repairing accident damage on motor vehicles have increased from year to year. Of these, the painting costs account for a considerable proportion. Not least of all the high, unrealistic expectations
8、and requirements of absolute (total) colour conformity have contributed to these costs. The pressure from the vehicle owner may lead to an extension of painting work and thus to an increase in repair costs, especially in cases where the damage was not caused by the owner. Such a trend was only possi
9、ble because objective methods and criteria were not available. Decisions were made based on subjective claims and not on an economically logical cost/benefit factor. In 1973, this situation led to the creation of a working committee with the aim of “working out the acceptability of colour difference
10、s in series and repair painting of motor vehicles”. Under the direction of the Bundesanstalt fr Materialprfung (Federal Institute for Materials Research and Testing BAM), Berlin, representatives of the Verband der deutschen Automobilindustrie (German Association of the Automotive Industry VDA), the
11、Verband der deutschen Lackindustrie (German Paint Industry Association VDL) and the Allianz-Zentrum fr Technik (Allianz Centre for Technology AZT) have since been engaged in Working Committee 24 Tolerances for automotive paints of the Normenausschuss Farbe (FNF) (Colour Standards Committee) to imple
12、ment two major prerequisites for objective colour assessment on motor vehicles: 1. Determination and development of a suitable mobile measuring instrument for the measurement of actual colour differences in accordance with current standards. 2. Specification of measuring tolerances for all colours o
13、n a motor vehicle. As to 1., portable instruments were tested and evaluated. The results led to the further specification of requirements and the compilation of a set of specifications which was made available to interested manu-facturers. As to 2., the present standard was drawn up. The results obt
14、ained over the past years have been published regularly. In addition to this aim, however, the committee is also concerned with expanding its investigations into fields of work that are related to painting. This particularly concerns the selection of appropriate lamps for paint shops and spray booth
15、s, the colour design of the walls, the visual comparison of the colour of paints under daylight fixtures etc. Based on these results, the Colour Standards Committee 24 FNF issues recommendations, which are published in well-known technical journals. This standard is the result of more than ten years
16、 of work, which illustrates the difficulty of the committees task, the importance of which has remained unchanged. As absolute colour conformity is technically unfeasible, measurements must be made possible and colour tolerances made available. To achieve this goal, for the first time ever worldwide
17、 the working committee conducted evidence-based investigations on the object and specified colour tolerances. It is thus possible to substantiate previous subjective interpretations of acceptability. It has to be ensured for the measurement that the error limits of the measuring instrument used are
18、significantly smaller than the colour tolerances required. This may constitute a difficult requirement for the manufacturer of mobile measuring instruments. The user of this standard has the choice between the DIN 6175-1:2009-07 5 spectrophotometric and the tristimulus method for colour measurement.
19、 Tristimulus colorimeters with good spectral adaptation meet the requirements of this standard if the colour tolerances of paints with nearly identical spectra are to be determined. However, the possibility of faulty measurements due to insufficient spectral correction adjustment increases with incr
20、easing metamerism of the paints to be compared. When testing paint products according to 5.1, the type of application of the paint to produce the test specimen surface to be measured may have a profound effect on the colour achieved and thus affect the test results. Hence the inaccuracies of the app
21、lication shall also be substantially smaller than the required tolerances, which imposes considerable requirements on the application method. The metrological industry is hence called upon to improve and reduce the price of colorimeters currently on the market. This is the only way a wider distribut
22、ion and their application on a wider scale can be achieved. Explanatory remarks on this edition of the standard The situation concerning this standard has significantly improved since 1986. Several good-quality and reasonably priced mobile colorimeters are available on the market and in world-wide u
23、se. Latest developments in colorimetry, especially DIN 6176, have replaced the fragmentation of the colour space which was included in the 1986 edition (the fragmentation was necessary in order to correct the errors of the CIELAB colour space which is now done by the DIN99 formula in DIN 6176). This
24、 edition has therefore become even easier to use and understand; problems occurring at the limits of the colour space are no longer problematic. DIN 6175-1:2009-07 6 1 Scope Colour tolerances according to this standard apply for unstructured solid (“uni”) and repair paints on vehicle bodies and atta
25、chments such as bumper bars, spoilers, panels, mouldings etc. Paints are manufactured as solid or goniochromatic paints. They have different properties and thus for both types of paints different tolerances apply. 2 Normative references The following referenced documents are indispensable for the ap
26、plication of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 5033-1, Colorimetry Part 1: Basic terms of colorimetry DIN 5033-2, Colorimetry Part 2: Standard colorimetric
27、 systems DIN 5033-3, Colorimetry Part 3: Colorimetric measures DIN 5033-4, Colorimetry Part 4: Spectrophotometric methods DIN 5033-6, Colorimetry Part 6: Tristimulus method DIN 5033-7, Colorimetry Part 7: Measuring conditions for object colours DIN 6174, Colorimetric evaluation of colour coordinates
28、 and colour differences according to the approximately uniform CIELAB colour space DIN 6176, Colorimetric evaluation of colour differences of surface colours according to DIN99 formula 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 solid pai
29、nts (uni paints) pigmented paint film without direction-dependent effects 3.2 goniochromatic paints paint containing a pigment imparting an effect, and in the case of coloured products, containing additionally coloured pigments NOTE A pigment imparting an effect may be e.g. lamellar aluminium. 3.3 c
30、olour difference magnitude of the subjective difference between two colours DIN 5033-1:1979 NOTE The colour space DIN 6176 (DIN99 formula) which is perceived as subjectively better compared to DIN 6174 (CIELAB) is used for the calculation of colour differences. The segmentation of the colour space i
31、n the chromaticity diagram used in the 1986-07 edition of this standard has therefore become obsolete. 3.4 colour tolerance largest still permissible colour difference between two automotive paints NOTE 1 The tolerance is seen as the colour difference tolerated by the overwhelming majority of observ
32、ers, which in individual cases may be above the threshold of recognizable colour differences. NOTE 2 Two automotive paints can be e.g. a colour sample and its realization. DIN 6175-1:2009-07 7 4 Colorimetry The colour measurement of automotive paints with the same gloss shall be undertaken using eit
33、her the tristimulus method (according to DIN 5033-6) or the spectrophotometric method (according to DIN 5033-4) with measuring geometry 45/0 or 0/45 (according to DIN 5033-7). Measurements on flat specimens can also be made with spherical geometry excluding gloss. The measurement results shall be ca
34、lculated based on standard illuminant D65 and the 10 standard colorimetric observer (according to DIN 5033-2). The colour differences shall be calculated from the measured standard colour values according to DIN 6174, followed by DIN 6176. 5 Colour tolerances 5.1 Supply of paints The limits of colou
35、r tolerances E99= 0,3 apply for the acceptance of supplied paint products with which a desired colour impression can be produced if applied as agreed. The ranges for the respective types of colours (according to DIN 5033-3) determine their tolerance compared to their agreed colour samples. For the s
36、upply of series paints, the differences L99, 99and b99shall also be specified. 5.2 Paint finish After the painting the various points on a car shall not exceed E99= 0,45. 5.3 Repair finish In the case of repair paintings of motor vehicles the repaired areas or parts of the motor vehicle adjacent to
37、the paint shall not exceed E99= 0,6 compared to the cleaned original paint. If repair and original paintings are separated by beading, decorative mouldings, cavities etc., this tolerance may be doubled. These colour differences to the original paints shall also be complied with for D65, A and F11 il
38、luminants (to avoid metamerism). DIN 6175-1:2009-07 8 Bibliography DIN 5033-8, Colorimetry Part 8: Measuring conditions for light sources DIN 5033-9, Colorimetry Part 9: Reflectance standard for calibration in colorimetry and photometry Automobiltechnische Zeitschrift 80 (1978), No. 2, pp.6971 Autom
39、obiltechnische Zeitschrift 81 (1979), No. 12, pp. 649652 Danner, M., and Anselm, D.: Farbtoleranzen in der Kraftfahrzeuglackierung Part I: Bestimmung von Krm-mungsradien und Unterteilung von Lackflchen am Personenkraftwagen. defazet (1976) No. 10, pp. 433435 Der Fahrzeug- und Metall-Lackierer 24 (19
40、80), No. 8, pp. 811 Der Fahrzeug- und Metall-Lackierer 24 (1980), No. 9, pp. 3241 Der Fahrzeug- und Metall-Lackierer 24 (1980), No. 10, pp. 2329 Der Maschinenschaden 51 (1978), No. 4, pp. 165167 Der Maschinenschaden 51 (1978), No. 5, pp. 192196 Der Maschinenschaden 51 (1978), No. 6, pp. 235239 Heinr
41、ich, F., and Zwernemann, K.: Farbtoleranzen in der Kraftfahrzeuglackierung Part III: Der Einfluss von Zierleisten, Spaltbreiten und Prgekanten auf das Farbunterscheidungsvermgen bei der UNI-Lackierung von Kraftfahrzeugen. defazet (1978) No. 3, pp. 114117 Terstiege, H., and Gundlach, D.: Farbtoleranz
42、en in der Kraftfahrzeuglackierung Part II: Der Einfluss zylindrischer Krmmungen auf die Farbmessung von UNI-Lacken. defazet (1978) No. 2, pp. 7074 VDA-Prfblatt 621-409 Durchfhrung des Farbvergleiches an pigmentierten Systemen. Obtainable from: Dokumentation Kraftfahrwesen e. V. (DKF), Grnerstrae 5, 7140 Ludwigsburg
