Flameproof material or conglomerate

摘要

An expanded material or conglomerate exhibiting outstanding fire-retardant properties and having an elevated specific weight contains 20 to 80% by weight of a binder constituted by a phenol-formaldehyde resin, 20 to 80% by weight of a gypsum obtained as a by-product in the preparation of phosphoric acid, and possibly inert filler materials which may be constituted by inorganic or organic substances.