Specifications for a Quality Label for Paint, Lacquer and ... - Qualicoat

- Before application, each coating (of a system or supplier) must be tested forresistance to boiling water, followed by an adhesion test (see section 2.4).- During application, resistance to boiling water should be tested, followed by anadhesion test every 4 hours.Coating plants which decide to use such treatments must inform their nationalassociation, or QUALICOAT if there is not a national association.3.2.4 Alternative pre-treatmentsAlternative pre-treatments are treatments other than the pre-treatments describedabove.Such alternative pre-treatments may not be used until they have been approved byQUALICOAT, following a test programme.Coating plants which decide to use such treatments must inform their nationalassociation, or QUALICOAT if there is not a national association. The coating plantsand suppliers must comply with the special specifications set out in Appendix A6.3.3. Pre-treatment for electrophoretic coatingsAll parts to be coated must be cleaned by adapted treatment in an alkaline or acidsolution. The cleaned surfaces must be rinsed in demineralised water with a maximumconductivity of 30 µS at 20°C prior to coating. The surfaces must be wettable withwater.The parts must be coated immediately.All workers handling pre-treated parts must wear clean textile gloves to avoidcontamination of the surface.3.4. Oven drying3.5. StovingAfter pretreatment and before the application of coating, the parts must be driedthoroughly in an oven. For this purpose, a drying oven must be installed in each plant.The conditions between the spray booth and the oven must be absolutely free of dustand contamination.All coatings must be stoved immediately after application. The oven must bring themetallic parts to the required temperature and maintain them at that temperature for thewhole length of the stoving time.The temperature of the metallic parts and the stoving time must match the valuesrecommended in the manufacturer's technical specifications.It is recommended to keep the difference in temperature between the coldest andhottest sections of the treated parts below 20°C.It must be possible to measure the temperature over the whole length of the oven.QUALICOAT SPECIFICATIONS 21 11 th Edition