Time to Replace Masonite Royalcote Wall Paneling?
Masonite was made out of wood fibers. The contractor I work with had some tested because Masonite cement board has asbestos.
What we found out was it is only wood. Many composite wood products use formalgahid in the glue. Masonite is steam bonded with high pressure. With that said the insulation behind the Masonite was asbestos.