Changes  The following changes have been made as compared to Test Specification PV 1503, 1998-02: Standard compley 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  Test method
3.1  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)
3.2  Specimen preparation
3.2.1  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.
3.2.2  Steam jet test after loading (e.g. 240 h according to DIN 50 017 KK)  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.
 
 
 

 
 
 


3.4 Procedure
3.4.1  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*)  
DIN 50 014 Climates and their Technical Application; Standard Atmospheres  
DIN 50 017 Atmospheres and their Technical Application; Condensation Water Test    Atmospheres  
DIN EN ISO 7253  Paints and Varnishes – Determination of Resistance to Neutral Salt Spray (Fog)