PV1503_EN_2003-03-01

The English translation is believed to be accurate. In case of discrepancies the German version shall govern. Steam Jet Test Konzernnorm Descriptors: color, paint, varnish, paint coating, paint adhesion, steam jet test Paint Coating of Metallic and Non-Metallic Materials PV 1503 Changes The following changes have been made as compared to Test Specification PV 1503, 1998-02: 󰅆 󰅆 Standard completely revised Contents of PV 1504 added Previous issues PV 1503: 1987-10; 1996-12; 1998-02; PV 1504: 1990-10 1 Scope This standard describes a procedure to determine paint adhesion on metallic and non-metallic materials. It simulates the stresses produced when surfaces are cleaned with a steam jet using two different tests: Test A: flat angle of jet along the two intersecting legs of the St. Andrew's cross (see Figure 1) Test B: steep angle of jet in the center of the St. Andrew's cross The test to be used shall be agreed with the responsible engineering department. 2 Description Steam jet test according to PV 1503A, or steam jet test according to PV 1503B. 3 3.1 󰅆 󰅆 󰅆 󰅆 󰅆 Test method Equipment and auxiliary equipment Steam jet (e.g. Kärcher or NIFAB) Painted non-metallic parts (e.g. bumper and mirror housing) Painted metallic exterior parts and parts of the chassis Scratch marker per van Laar and Clemen according to DIN EN ISO 7253 Cutter (e.g. Edding, cutter ML 18) Form FE 41 - 01.03 Page 1 of 4 Fachverantwortung/Responsibility K-QS-31, Frau Kern, Tel: -28507 I/PG-61, Frau Keller, Tel: -90888 Normung/Standards (EZTD, 1733) Woll Wiesner Tel: +49-5361-9-29064 Sobanski 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 Norm vor Anwendung auf Aktualität prüfen / Check standard for current issue prior to usage. Klass.-Nr. 50 24 1 March 2003 Page 2 PV 1503: 2003-03 3.2 3.2.1 󰅆 󰅆 Specimen preparation Unloaded steam jet test (as-received condition) Conditioning of painted plastic parts for 48 h at 50 °C or 24 h at 60 °C followed by aging in the DIN 50 014 – 23/50-2 standard climate. Conditioning of painted metallic exterior parts and parts of the chassis for 24 h in the DIN 50 014 – 23/50-2 standard climate. Steam jet test after loading (e.g. 240 h according to DIN 50 017 KK) 3.2.2 Conditioning of the specimens before the steam jet test after loading (e.g. 240 h according to DIN 50 017 KK). Acclimatization of the plastic parts for 24 h in the DIN 50 014 – 23/50-2 standard climate. 3.3 Test conditions and setting parameters See Table 1. Table 1 No. Parameter 1 2 3 Preset working pressure (depending on device type and hose length) Outlet temperature measured 10 cm from the nozzle Impact pressure measured 15 cm from the nozzle at an angle of 90° Nozzle type depending on device manufacturer Distance from nozzle to specimen = 15 cm PV 1503A (90 ± 5) bar (60 to 70) °C PV 1503B (19 ± 2) N Spraying Systems TP2505 EG NIFAB 2506 To be used for paint coatings of any type on plastic and metal on the exterior of the vehicle (requirements according to Technical Supply Specification). - To be used for low-temperature paint coating (e.g. 90 °C) on all substrates, see No. 12 for control limit, paint flakes 󰂔 3 mm² are permissible at the point of intersection of the St. Andrew's cross or along the intersecting legs of the St. Andrew's cross. 4 5 6 Distance from nozzle to specimen = 5 cm Page 3 PV 1503: 2003-03 No. Parameter 7 Distance from nozzle to specimen = 2 cm - PV 1503A PV 1503B To be used for high-temperature paint coating (140 °C); control limit and requirement as for No. 6. 90° 1 x 20 s, slight swinging movement, even spraying above the point of intersection of the St. Andrew's cross. 8 9 Angle of jet Duration of spraying 45° Spraying acc. to Figure 1 10 Nozzle alignment Along the intersecting Point of intersection legs of the of the St. Andrew's St. Andrew's cross cross on the specimen Material to be used: Styroform RTM from Stadur-Süd GmbH, procedure according to 3.4.1 test result at 15 cm (distance from nozzle to specimen) indicate a test result that is still acceptable. However, the paint adhesion of the specimen must be optimized and the specimen must be resubmitted. 11 Spray pattern (check of the setting parameters) Control limit 12 Paint flakes ≥ 3 mm² and an acceptable 1 x 20 s at 45° angle 1 x 20 s at 45° angle and Figure 1 – Duration of spraying for test according to PV 1503A Page 4 PV 1503: 2003-03 3.4 3.4.1 Procedure Check of the spray pattern The spray pattern is checked using an extruded polystyrene hard foam (see Section 3.3, Table 1, No. 11) with a closed cell structure and flame-retardant additive. The Styroform block is placed in a clamp and the test is carried out with a distance of 12 cm between the nozzle and the block. The penetration depth of the spray jet shall not exceed 5 mm and the spray pattern length shall not exceed 10 cm. 3.4.2 Procedure with specimens A crosscut (St. Andrew's cross) is made in the specimen according to DIN EN ISO 7253 (the paint structure must be scribed down to the substrate). The specimen is then subjected to the steam jet under the conditions specified in Section 3.3. 3.5 Evaluation The specimen is visually inspected for any evidence of detachment of the paint surface after spraying with the steam jet. The evaluation is based on the degree of damage (length of the detached area at the St. Andrew's cross in mm). Minor flakes up to 1 mm caused by bad cutting at the crosscut will be disregarded from the evaluation. 4 Referenced standards*) Climates and their Technical Application; Standard Atmospheres Atmospheres and their Technical Application; Condensation Water Test Atmospheres Paints and Varnishes – Determination of Resistance to Neutral Salt Spray (Fog) DIN 50 014 DIN 50 017 DIN EN ISO 7253 *) In this section, terminological inconsistencies may occur as the original titles are used.