Klass.-Nr. 55 10 4 August 2002 Plastic Interior Components Testing of Scratch Resistance PV 3952 Konzernnorm Descriptors: plast ic, inter ior, comp onent , sc ratc h resistance, cr ossc ut t est, test Page 1 of 4 Fachverantwortung/Responsibi l ity Normung/Standards (EZTN, 1733) K-QS-31 Frau Radon Tel:-31886 Frau Hager-Süß Tel: +49-5361-9-49035 Sobanski Vertraulich. Alle Rechte vorbehalten. Weitergabe oder Vervielfältigung ohne vorherige schriftl. Zustimmung einer Normenabteilung des Volkswagen Konzerns nicht gestatte t. Vertragspartner erhalten die Norm nur über die zuständige Beschaffungsabteilung. Confidential. All 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 N o r m v o r A n w e n d u n g a u f A k t u a l i t ä t p r ü f e n / C h e c k s t a n d a r d f o r c u r r e n t i s s u e p r i o r t o u s a g e . F o r m F E 4 1 1 2 . 0 0 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 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 according to the technical supply specifica- tion and/or release. 5 Test 5.1 Principle A machine- guided scratc hing gouge scratc hes a grid with a spacing of approx. 2 mm onto a painted/unpa inted plastic surface. Each scratch is produced by one movement in one direction. A colorimeter is then used to determine 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 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 standard light acc. to DIN 6173 Parts 1 and 2 - Standard light D65 (minimum requirement: quality grade 2) T h e E n g l i s h t r a n s l a t i o n i s b e l i e v e d t o b e a c c u r a t e . I n c a s e o f d i s c r e p a n c i e s t h e G e r m a n v e r s i o n s h a l l g o v e r n .