Method for manufacturing closed foam tile and closed foam tile

摘要

PROBLEM TO BE SOLVED: To provide a method of producing an independent foaming tile that cannot only lower a foaming temperature but also is light and non-water absorptive, and a tile obtained according to the method.SOLUTION: In a mixed material of a fly ash of JIS standard and at least one kind of crashed rock, coal ash, sand and clay or a mixed material thereof having a particle diameter of 500 μm or smaller and a silicon dioxide content of 45% or more, silicon carbide is added as a foaming agent, furthermore a slight amount of zinc powder is added, followed by wet kneading, further followed by heat-treating after press forming the material.