Abstract: A mat of mineral fibers has a random or quasi-random fiber orientation. The fibers have diameters which, for the great majority of them, are 2.5 to 4.5 micrometers, and a length of 2 to 15 cm. Its density is less than 40 kg/m3. Its resistance to compression, for a crushing of 10%, is equal to at least 0.5 kN/m2. The fineness of the fibers and their random distribution imparts to the mat an exceptional lightness and an excellent flexibility, making possible the perfect application of the mat on cylindrical surfaces.

Abstract: The invention relates to a cobalt-based alloy having mechanical strength at high temperature, in particular in an oxidizing or corrosive medium, essentially comprising the following elements (the proportions being shown as percentage by weight of the alloy):

Abstract: The present invention relates to a device for the internal centrifugation of fine mineral fibres, a method for forming fine mineral fibres, and paper containing fine mineral fibres.

Abstract: At least two machines placed side by side, including a series of centrifuging wheels arranged in a cascaded manner and driven in rotation about axes all having substantially in a same direction. Two consecutive wheels rotate in opposite directions, and are simultaneously fed with material to be fiberized. The material is poured onto the first wheel, is accelerated, and is conveyed onto the second wheel, and then optionally onto following wheels, in order to be converted into fibers by centrifugal ejection, the fibers being picked up by a gas stream and collected by a gathering device. The main axes of two adjacent machines are positioned along a non-zero angle adjusted in order for two gas streams emitted by the two adjacent machines to meet and combine. Such machines may find application in the manufacture of products based on mineral fibers.

Abstract: A facade system with a translucent porous insulating material of mineral or organic fibers for passive solar energy utilization is provided. The insulating material has on the outside a colored layer for design purposes and for controlling the light transmittance. The facade system is formed from a multiplicity of preferably factory-prefabricated facade insulating boards. The colored layer can, moreover, be designed in such a way that it protrudes beyond the insulating layer along two board edges. Consequently, when the facade insulating boards are applied to the building wall, the abutting edges in the region of the joins between neighboring insulating boards are covered by the overlapping protruding colored layer.

Abstract: The invention relates to a resin composition based on a urea-modified phenol-formaldehyde resole which has a formaldehyde/phenol molar ratio of 2 to 5, exhibiting a free formaldehyde content lower than or equal to 3 percent (by weight relative to the total weight of the composition), a free phenol content lower than or equal to 0.5 percent and a dilutability measured at 20° C., of at least 1000 percent and to a process for the preparation of this composition. This composition is characterized in that it contains an overcondensed resole obtained by the condensation of phenol, of formaldehyde, and optionally of urea in basic medium, until the product has a water dilutability at pH 9 that is lower than or equal to 2000 percent, or the product of neutralization of such as resole. The modification of an overcondensed phenolic resole by neutralization with boric acid according to the invention permits the dilutability of the resole to be increased.

Abstract: An improved high-density glass wool rigid panel for use in the construction of air distribution ducting in air conditioning and heating installations of the sort made of a box-shaped high-density glass wool body with optional glass fiber reinforcing mesh is disclosed. The rigid panel is formed with a step on opposite sides, covered with aluminum strips on the larger surfaces, wherein there is an overlap of said aluminum strips on step running right around its smaller side.

Abstract: The subject of the invention is a mineral wool capable of being dissolved in a physiological medium and comprising the constituents below in the following percentages by weight: SiO2 38-52% Al2O3 16-23% RO (CaO + MgO) 4-15% R2O (Na2O + K2O) 16-25% B2O3 0-10% Fe2O3 (total iron) 0-3%, preferably 0-1.5% P2O5 0-3%, preferably 0-1.5% TiO2 0-2%.

Abstract: Mineral wool capable of dissolving in a physiological medium, which mineral wool comprises the constituents below in the following percentages by weight: SiO2 39-55%, preferably 40-52% Al2O3 16-27%, ″ 16-25% CaO  3-35%, ″ 10-25% MgO  0-15%, ″  0-10% Na2O  0-15%, ″  6-12% K2O  0-15%, ″  3-12% R2O (Na2O + K2O) 10-17%, ″ 12-17% P2O5 0-3%, ″ 0-2% Fe2O3  0-15%, B2O3 0-8%, ″ 0-4% TiO2 0-3%, and in that MgO is between 0 and 5%, especially between 0 and 2%, when R2O≦13.0%.

Abstract: The production of mineral fibers by centrifuging on rollers (3, 4, 5, 6) with horizontal axes from a stream (1) of molten material includes determining the relative position of the stream (1) of molten material in relation to the first roller (3), and controlling this position by use of CCD cameras (8, 11, 40). A camera (11) observes the periphery of a fiber-drawing roller (4).

Abstract: A ventilation duct includes an envelope lined on the inside by insulation panels. The panels have a lining on the side of the flow channel of the duct and on at least one part of at least one of transverse edges of the duct. This lining extends over at least one part of each of both sides of the edge and is integrated with the panel. Z shaped sections may be used to hold adjacent panels.

Abstract: The only methods hitherto available for the production of mineral wool from materials such as basalt either utilize a stationary nozzle (blast drawing method) or external centrifuging whereby unsatisfactory yield and/or a not entirely satisfactory fiber quality, particularly with regard to a high content of unfiberized components, are achieved. By way of the invention, application of a fiberization method is suggested which, in spite of a high fluidity of the molten mineral material such as basalt, arrives at high quality fibers with a low bead proportion at good yield. This is made possible by selection of specific materials and their fiberization in specific conditions. Whereas fiberization of these fluid materials is carried out in external centrifuging at viscosities of a few tens of poises, fiberization by internal centrifuging at viscosities of more than 100 poises is required, according to the: invention, in order to achieve a mineral wool for insulation purposes with a low bead content.

Abstract: The invention relates to the electric melting technique, in which the melting energy is dissipated in the bath of melted glass as a result of the Joule effect by means of electrodes which dip through the surface of the bath. According to the invention, the electrodes dip into a bath of melted glass which has a height h below 800 mm and a surface S such that the ratio h/S is lower than 0.5 m/m.sup.2. According to another aspect, the exchange surface between the electrodes and the bath is above 0.075 m.sup.2 /m.sup.3 of glass.The invention is used in the manufacture of glass-based products, such as insulating materials based on glass fiber.

Abstract: In an acoustic building structure corresponding to the mass-spring-mass insulation principle, the two masses of the mass-spring-mass system are each formed of at least one rigid element (1,2) and are separated by at least one panel (4) of mineral wool combined with at least one air gap (5). The acoustic structure is such that the rigid elements (1,2) are trays with a U-shaped cross section and are lined on the inside of the U with at least one mineral wool (3).

Abstract: A machine winds a fibrous mat on itself after compressing it. The winding machine has two bands which each embrace about half the circumference of the roll being formed. The machine also includes a plate intended to keep the mat compressed. This plate and, if appropriate, a device for causing compression of the mat are movable and advance downstream as the fibrous mat is wound. In a variation, the compression device is fixed and the plate is lengthened.

Abstract: The present invention relates to mineral fibre composition which can dissolve in contact with a physiological medium. The composition of these fibres includes the following components, in accordance with the following proportions by weight:______________________________________ SiO.sub.2 48 to 67% Al.sub.2 O.sub.3 0 to 8% Fe.sub.2 O.sub.3 0 to 12% ______________________________________(total iron expressed in this form) ______________________________________ CaO 16 to 35% MgO 1 to 16% Na.sub.2 O + K.sub.2 O 0 to 6.5% P.sub.2 O.sub.5 0 to 5% ______________________________________taking into consideration that these compositions are also defined by the fact that the contents of these components comply with the following ratios:Na.sub.2 O+P.sub.2 O.sub.5 .gtoreq.2%Fe.sub.2 O.sub.3 +Al.sub.2 O.sub.3 .ltoreq.12%CaO+MgO+Fe.sub.2 O.sub.3 .gtoreq.23%.

Abstract: The subject of the invention is a mineral wool composition capable of dissolving in a physiological medium which comprises the constituents below, having to the following percentages by weight:______________________________________ (CaO + MgO + BaO + Na.sub.2 O + K.sub.2 O + B.sub.2 O.sub.3) > 30* 2 .times. Al.sub.2 O.sub.3 RO 13.5 to 19.5% R.sub.2 O 14.2 to 23% RO/R.sub.2 O 0.70 to 0.95 CaO/MgO > 1.5 SiO.sub.2 47 to 58.5% Al.sub.2 O.sub.3 0 to 3.5% B.sub.2 O.sub.3 5 to 10% Fe.sub.2 O.sub.3 (total iron) 0 to 3.0% ______________________________________where:RO means oxides of the elements from column 2a of the Periodic Table, including CaO, MgO, BaO and SrO; and R.sub.2 O means oxides from column 1a of the Periodic Table, including Na.sub.2 O, K.sub.2 O and Li.sub.2 O.

Abstract: The present invention concerns a method for melting recycled silicate starting materials. A rotating transport flow with helical flow filaments of transport air and starting material is supplied in the direction of the helix axis into the combustion chamber of a cyclone furnace. Preferably, pre-heated fresh air is used which is supplied partly into the combustion chamber as combustion air therefor and partly in the form of the transport air. Furthermore, the present invention concerns a device for melting recycled silicate starting materials. The device includes a combustion chamber where fuel and combustion air can be burnt up in the presence of the starting material. A forechamber is arranged between an admixer for generating an injector flow and the combustion chamber. The injector flow can be supplied into the forechamber through a charging conduit to generate a transport flow made up of starting material and transport air. The forechamber includes an outlet port opening into the combustion chamber.

Abstract: Mineral fiber composition which is decomposable in the physiological medium, characterized by the following constituents in weight percent: SiO.sub.2 30 to less than 51; Al.sub.2 O.sub.3 higher than 11.5, in particular higher than 13,up to 25; CaO 2 to less than 23; MgO 0 to 15; Na.sub.2 O+K.sub.2 O higher than 10, up to 19; TiO.sub.2 +Fe.sub.2 O.sub.3 6 to 18; various 0 to 3.

Abstract: The present invention relates to mineral fiber composition which can dissolve in contact with a physiological medium. The composition of these fibers includes the following components, in accordance with the following proportions by weight:______________________________________ SiO.sub.2 48 to 67% Al.sub.2 O.sub.3 0 to 8% Fe.sub.2 O.sub.3 0 to 12% ______________________________________(total iron expressed in this form) ______________________________________ CaO 16 to 35% MgO 1 to 16% Na.sub.2 O + K.sub.2 O 0 to 6.5% P.sub.2 O.sub.5 0 to 5% ______________________________________taking into consideration that these compositions are also defined by the fact that the contents of these components comply with the following ratios:Na.sub.2 O+P.sub.2 O.sub.5 .gtoreq.2%Fe.sub.2 O.sub.3 +Al.sub.2 O.sub.3 .ltoreq.12%CaO+MgO+Fe.sub.2 O.sub.3 .gtoreq.23%.