富士川建材工業株式会社 is a Yokohama mortar and finishing-materials maker whose Taika Mortar is one of only two タイカモルタル products listed by the Japan Architectural Finishing Materials Association (日本建築仕上材工業会) as holding 国土交通大臣認定 for steel fireproofing construction. The product came out of the public-private joint research programme with the Building Research Institute as an asbestos-free sprayed and trowelled fireproofing material.