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1、Klass.-Nr. 55 10 4August 2002 Plastic Interior Components Testing of Scratch Resistance PV 3952 Konzernnorm Descriptors:plastic, interior, component, scratch resistance, crosscut test, test Page 1 of 4 Fachverantwortung/ResponsibilityNormung/Standards (EZTN, 1733) K-QS-31Frau RadonTel:-31886Frau Hag
2、er-S Tel: +49-5361-9-49035Sobanski Vertraulich. Alle Rechte vorbehalten. Weitergabe oder Vervielfltigung ohne vorherige schriftl. Zustimmung einer Normenabteilung des Volkswagen Konzerns nicht gestattet. Vertragspartner erhalten die Norm nur ber die zustndige Beschaffungsabteilung. Confidential. All
3、 rights reserved. No part of this document may be transmitted or reproduced without the prior written permission of a Standards Department of the Volkswagen Group. Parties to a contract can only obtain this standard via the responsible procurement department. VOLKSWAGEN AG Norm vor Anwendung auf Akt
4、ualitt prfen / Check standard for current issue prior to usage. Form FE 41 - 12.00 1 Scope This test standard serves to determine the scratch resistance of painted and unpainted plastic inte- rior components. A scratch test (crosscut test) is performed on the surface of the component to this end. 2
5、Designation Scratch resistance acc. to PV 3952 3 Definition The scratch resistance of plastics is defined as the resistance offered by the material to a mechani- cal stress, e.g. scratching motion of a sharp edge or rounded object. 4 Requirements Requirements and deviations from the test procedure a
6、ccording to the technical supply specifica- tion and/or release. 5 Test 5.1 Principle A machine-guided scratching gouge scratches a grid with a spacing of approx. 2 mm onto a painted/unpainted plastic surface. Each scratch is produced by one movement in one direction. A colorimeter is then used to d
7、etermine the chromatic aberration in relation to the unscratched sur- face. 5.2 Test equipment and auxiliary equipment - Scratching device (e.g. motor-driven crosscutting tool, from Erichsen, model 430; see Figures 1 and 2) - Scratching gouge (e.g. hard metal tip = 1 mm; the engraving tip of the 318
8、 hardness testing device from Erichsen is suitable) - Colorimeter acc. to DIN 5033-4 - Measurement shapes acc. to DIN 5033 7 section 3.2.1 - 45/ 0 or section 3.2.2 - 0/ 45 (ideal 45 circular) Other shapes are also permissible upon agreement with the test laboratories. - Visual evaluation under stand
9、ard light acc. to DIN 6173 Parts 1 and 2 - Standard light D65 (minimum requirement: quality grade 2) The English translation is believed to be accurate. In case of discrepancies the German version shall govern. Page 2 PV 3952: 2002-08 5.3 Specimen The specimens must be removed from the components un
10、der test and should be of a shape and size that ensures plane contact with the specimen holder and the supporting table of the respective spectrophotometer. The test surface must be plane parallel with the contact surface. 5.4 Specimen preparation The surface of the specimens must be homogeneous and
11、 must have no foreign matter. Specimens should only be handled with clean, grease-free hands. 5.5 Conditioning The specimens must be conditioned for a minimum of 48 h in a standard climate according to DIN 50 014-23/50-2. 5.6 Procedure The test is performed at (23 5) C. A scratching tool is used to
12、scratch a grid (crosscut grid) of at least (40 x 40) mm. See Figure 3. Testing parameters: - Contact force F = 5 N and 10 N (for unpainted components; F is dependent on the position in the vehicle and the component specifications) F = 10 N (for painted components) - Scratching speed v = 1,000 mm/min
13、 - Grid spacing2 mm - Scratching gouge 1 mm (e.g. engraving tip from the 318 hardness testing device from Erichsen) Page 3 PV 3952: 2002-08 Figure 1 - Figure 1 Figure 2 Specimen mounting Page 4 PV 3952: 2002-08 Figure 3 5.7 Evaluation The measured values for dL*, da*, db* and dE* of the unscratched
14、area from the scratched area, determined using colorimetry, are used for evaluation (measured value = mean of at least 5 indi- vidual measurements). Measuring method acc. to DIN 5033-4 Color change acc. to DIN 6174 Illuminant: D65 / 10 Measuring field diameter: 7 mm In addition, a test of the measur
15、ed values for plausibility of the optical impression must be per- formed (even when the measurements indicate an evaluation of OK). 6 Referenced standards DIN 50 014Climates and Their Technical Application; Standard Climates DIN 5033-4Colorimetry; Spectral Method DIN 5033-7Colorimetry; Measuring Con
16、ditions for Object Colors DIN 6173-1Color Sampling; General Color Sampling Conditions DIN 6173-2Color Sampling; Lighting Conditions for Artificial Medium Daylight DIN 6174Colorimetric Determination of Color Intervals with Object Colors According to the CIELAB Formula Grid spacing 2 mm Grid width approx. 40 mm