Disclosed herein are methods for forming low melting point glass fibers comprising providing a glass feedstock comprising a low melting point glass and melt-spinning the glass feedstock to produce glass fibers, wherein the glass transition temperature of the glass fibers is less than or equal to about 120% of the glass transition temperature of the glass feedstock. The disclosure also relates to method for forming low melting point glass frit further comprising jet-milling the glass fibers. Low melting point glass frit and fibers produced by the methods described above are also disclosed herein.

The invention provides a method of manufacture of man-made vitreous fibers (MMVF) comprising: providing a fiberizing apparatus, wherein the fiberizing apparatus comprises: a set of at least three rotors each mounted for rotation about a different substantially horizontal axis; wherein each rotor has a driving means; rotating the rotors; wherein the first rotor rotates to give an acceleration field of from 25 to 60 km/s.sup.2 and the second and third rotors each rotate to give an acceleration field of at least 125 km/s.sup.2, providing a mineral melt, wherein the melt has a composition comprising the following, expressed by wt of oxides: SiO.sub.2 in an amount of from 33 to 45 wt %, Al.sub.2O.sub.3 in an amount of from 16 to 24 wt %, an amount of K.sub.2O and/or Na.sub.2O, an amount of CaO and/or MgO, wherein the ratio of the amount of Al.sub.2O.sub.3 to the amount of SiO.sub.2 is in the range 0.34-0.73, wherein the ratio of the total amount of K.sub.2O and Na.sub.2O, to the total amount of CaO and MgO, is less than 1; pouring the melt on to the periphery of the first rotor; wherein melt poured on to the periphery of the first rotor in the set is thrown on to the periphery of the subsequent rotors in turn and fibers are thrown off the rotors; and collecting the fibers that are formed. Man-made vitreous fibers (MMVF) can thus be formed having a median length of 100 to 300 m, a median diameter of not more than 2.5 m, and wherein the ratio of the median fiber length to median fiber diameter is 25 to 500.

A hybrid insulation product, and a related system and method of producing the hybrid insulation product in a cost-effective manner are disclosed. The insulation product has superior insulating and flame-retarding properties when compared to fiberglass insulation. The product can be used in blown-in applications, batts production, and board production.

A hybrid insulation product, and a related system and method of producing the hybrid insulation product in a cost-effective manner are disclosed. The insulation product has superior insulating and flame-retarding properties when compared to fiberglass insulation. The product can be used in blown-in applications, batts production, and board production.

Apparatus for forming melt-formed fibres comprises: a source of molten material; a spinning head comprising one or more rotors; a plurality of nozzles or slots disposed around at least part of the one or more rotors, configured to supply a stream of gas; a conveyor; and a barrier (4) between the spinning head and the conveyor (6), an upper edge of the barrier lying below a horizontal line (22) lying in a first vertical plane (17) including axis of rotation (16) of at least one rotor of the one or more rotors and intersecting the intersection of the axis of rotation with a second vertical plane (18) orthogonal to the first vertical plane and including a vertical line (20) through said region, the included angle between the horizontal line (22) and a line (21) in the first vertical plane joining the upper edge of the barrier and the intersection of the horizontal line and axis of rotation being in the range of 40?-85?. Method of making melt-formed fibres using the apparatus. Melt formed biosoluble fibres being alkaline earth silicate fibers having a low shot content.

The invention relates to a method for producing rock wool and cast iron by melting a mixture of materials such as basalt, blast-furnace slag, coke and components necessary for melting, with an admixture containing alumina, said admixture making it possible to adjust the alumina content in order to obtain a rock wool having the following composition (as wt %): Al2O3: 18-22; SiO2: 40-50; CaO: 10-15; MgO: <10; FeO: <2; Na2O: <4; K2O: <2. The method includes the following operations: producing by melting a slag and a cast iron, separating the slag and the cast iron, and performing a fibring operation on the slag followed by a bonding operation in order to obtain the rock wool. According to the invention, at least one spent adsorbent and/or catalyst is used as an admixture, said catalyst containing alumina in Al2O3 form. Said adsorbent and/or catalyst preferably contains at least one metal, and said metal is retrieved in the cast iron.

The present invention concerns a method and an apparatus (12) for measuring the temperature of a fluid stream (11), said apparatus comprising a movable frame (13, 14) having first end facing towards the fluid stream to be measured and an oppositely directed second end; a beam splitter (9) which is movably arranged in the frame for advancement into said fluid stream to open the fluid stream; an optical temperature measurement device (8) for determining the temperature of the fluid stream by measuring the thermal radiation from the fluid stream; and control means for controlling the movement of the frame and the beam splitter and controlling the performance of the optical temperature measurement device.

The present invention relates to a glass ceramic powder comprising i) a glass material formed from a glass mixture containing a lithium and oxygen containing compound selected from Li.sub.2O and/or Li.sub.2CO.sub.3, SiO.sub.2, K.sub.2O, La.sub.2O.sub.3, and ii) seed particles comprising Li.sub.2SiO.sub.3 crystals and/or Li.sub.2Si.sub.2O.sub.5 crystals. The present invention also relates to a method of manufacturing of said glass ceramic powder, a method for preparing compacted and sintered bodies from the glass ceramic powder and bodies obtainable by said method.

A machine for fiberizing mineral wool by free centrifugation, includes a frame on which is mounted at least one centrifugation wheel, the centrifugation wheel being connected to a transmission shaft designed to rotate it by transmitting the movement of rotation of an output shaft of a drive unit, wherein the machine further includes at least one intermediary transmission box connected at least by one input to the drive rod and by one output to the transmission shaft, the intermediary transmission box being arranged such as to transmit the movement of rotation of the drive shaft to the transmission shaft.

A machine for fiberizing mineral wool by free centrifugation, includes a frame on which is mounted at least one centrifugation wheel; a transmission shaft connected to the at least one centrifugation wheel and configured to rotate the centrifugation wheel; a drive unit including an output rod; and an intermediary transmission box connected at least by one input to the output rod of the drive unit and by at least one output to the transmission shaft, wherein the intermediary transmission box includes a coupling mechanism operatively arranged between the output rod and the transmission shaft, the coupling mechanism being configured to transmit rotational movement from the drive unit to the transmission shaft including one or more rotary engagement elements.