Coating/overlay panels

Secondary Treatments and Uses. Because hardboard products are utilized in a myriad of different ways, the variety of secondary treatments used by customers are practically unlimited. Hardboards are used in furniture, cabinets, paneling, doors, toys, and a host of other uses. Post-treatments may include cutting-to-size, finishing treatments with roU-appHed patterns, melamine overlays, printed paper overlays, paints, and even some extremely durable and water-resistant coatings used in tub and shower linings or other uses where water contact is frequent and extreme. 

Protection of exterior reconstituted panel products (in particular particle board) by surface coatings, treatments and overlays, and subsequent weathering performance, has received considerable attention (J, JJ, 74, J33, 153-155, 157-159), Painted and overlaid boards are much more durable than unfinished boards. Addition of wax as a water repellent benefits performance of the boards, but does not protect against water vapor (J, 11, 74). 

Because of the experience at the KIVCET plant at Portovesme, Italy, chloride attack at the bottom part of the radiation boiler was anticipated before start-up. This is the reason for using replaceable boiler panels at the bottom of the vertical boiler. A protective flame spray coating was also afiplied. The coating failed after a few months and it became necessary to apply an Inconel 625 weld overlay. This ovo-lay now covers 160 m of the boiler surface and appears to be working well. 

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