To provide an incombustible electric wave absorbing material and an incombustible electric wave absorbing laminate that are appropriate, for example, for an interior material and a ceiling material inside a chamber where wireless LAN is adopted, and a wall material, a ceiling material or the like of a tollgate, where ETC is adopted due to an proper electric wave absorption capability thereof, and that are easily constructed and transported due to their light weight.
The incombustible electric wave absorbing material 10 according to a first embodiment contains cement, a siliceous raw material, fiber reinforcements, a ferrite powder and a conductive carbon black, with the ferrite powder content and conductive carbon black content accounting for 20-60 mass percent, and 1-5 mass percent of the total, respectively. In the incombustible electric wave absorbing laminate 1 according to a second embodiment, an electric wave reflecting body 11 is laminated on one surface of the incombustible electric wave absorbing board 10, while a constitution of a calcium silicate plate 12 laminated on the other side of the incombustible electric wave absorbing board 10 is adopted.
ARAKAWA SHUICHI
| JPH10215097A | 1998-08-11 | |||
| JP2004278226A | 2004-10-07 | |||
| JP2003229693A | 2003-08-15 | |||
| JP2003218578A | 2003-07-31 |
Kanji Nakayama
Tsuyoshi Ishizaki