An essentially non-slumping, high density, low moisture and low cement castable composition, consisting of a tempered, pumpable first component having a density of at least 120 pcf containing the castable solids and consisting essentially of a refractory aggregate, a calcium-aluminate cement, a flow aid, a deflocculating agent, and water, the water being present in the lowest amount sufficient to achieve a pumpable consistency of the tempered first component, and a flocculating agent as a second component to be added to said first component at time of installation in an amount sufficient to prevent falling or slumping of the castable composition once it has been applied. The invention also includes the method of applying such castable through a spray nozzle in which the flocculating agent is added to the tempered first component just prior to its application through a spray nozzle.

A homogeneous, flexible, resilient, intumescent mat material comprising fiber, binder, and an intumescent agent which includes a mixture of unexpanded vermiculite and expandable graphite undergoes intumescence at a lower temperature, with an enhanced degree of expansion and with a lesser degree of contraction upon prolonged heating. The intumescent mat can be employed in catalytic converters for motor vehicles and as a firestop material.

A noncombsutible material is produced by making paper from a slurry essentially consisting of a sepiolite as a main material, an inorganic fiber or a glass fiber as a reinforcer, a first binder composed of PAA (polyacrylamide) as a thermoplastic resin, and a second binder composed of EPA (polyamide-polyamine-epichlorohydrine) as a thermosetting resin. The noncombustible material is given incombustibility and water resistance by the main material of the sepiolite, so that its productivity is improved thereby enabling a paper making of low costs.

Mortier souple pour imperméabiliser le revêtement interne et/ou exteme d'ouvrages en ciment, béton, acier, fonte, constitué par une phase liquide et par une phase hydraulique :

• dans lequel la phase liquide est une phase organique comprenant de l'eau et une émulsion de latex ;
• et dans lequel la phase hydraulique comprend un mélange d'au moins deux silices de granulométrie différente,

• en ce que la phase hydraulique comprend un ciment alumineux fondu ;
• en ce que la phase liquide organique comprend une émulsion aqueuse d'un copolymère de styrène et d'ester acrylique.

L'invention concerne également un procédé pour étancher un ouvrage avec ce mortier.

A method for producing a fibrous board having a decorative, textured surface comprising the steps of:

• (a) forming a wet mat of entangled mineral fibres;
• (b) pressure moulding (19,20) said fibrous mat while it is still wet to produce a textured surface pattern; and
• (c) drying (23) said mat.

The mat is preferably formed on a Fourdrinier or a cylinder machine from an aqueous slurry comprising mineral wool, clay, perlite, newsprint, starch and a flocculant. A paint or water (22) may be applied (18, resp. 21,21') to the mat before the pressure moulding step.