| Résumé : |
Last month, in the firts part of this article, PPCJ covered the reasons to switch to waterborne wood primers and this month, the author describes testing and development.
To evaluate the technical feasibility of waterborne primers, an extensive testing program was set up. These test series are intended to evaluate the performance of the primers and to validate their performance compared to solventborne primers. The test program is a result of cooperation of paint manufacturers, joinery industries and an organisation controlling the overall quality of joinery products. The usual test program consists of outdoor exposure and laboratory tests. Paint systems are exposed outside for four years. The complete paint system should have good outdoor durability during these four years, while the primer should have wood protecting properties on its own for one year's exposure. The outdoor exposure L-joints are evaluated for dry and wet adhesion, cracking, blistering, chalking and flaking. These durability tests are performed after optimum drying. |
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A dutch portrait of frames in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4456 (09/2002)
