Isolite Insulating Products Co., Ltd.

Hidenao Kawasaki

Osamu Kawasaki

A ceramics sound absorption material made of a ceramics block which is obtained by adding a combustible pore-forming material to at least one selected from refractory clay and refractory chamotte and calcining the blend, which has communicating pores having a main pore diameter of 0.2 to 2,000 &mgr;m, which has an air permeability of at least 1 cm &middot;cm/cm &middot;sec&middot;cmH O, and in which surface a large number of sound absorption holes or sound absorption grooves are formed, a glaze being applied to only the surface except the inner peripheral surfaces and the bottom surfaces of the sound absorption holes or the sound absorption grooves to form a glaze layer which fills the communicating pores and which is substantially free from an air permeability. The porous ceramics sound absorption material is excellent in sound absorption characteristics and a weatherability, and is less stained in particular. Stains once adhered are easily removed, and a good appearance can be maintained for a long period of time.

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Toyokawa, Japan

Hidenao Kawasaki