Abstract: The present invention relates to modified glass fiber membranes which exhibit sufficient hydrophilicity and sufficient electropositivity to bind DNA from a suspension containing DNA and permit elution of the DNA from the membrane. Generally, the hydrophilic and electropositive characteristics are expressed at the surface of the modified glass fiber membrane. Preferred modified glass fiber membranes of the present invention include glass fiber membranes that have been modified by treatment with trifluoroacetic acid (TFA), BCl.sub.3, SiCl.sub.4, NaOH, F.sup.-, AlCl.sub.3 alone or in combination, with or without water. The modified glass fiber membranes of the present invention are particularly useful in processes for purification of DNA from other cellular components.

Abstract: Composite materials formed from bone bioactive glass or ceramic fibers and structural fibers are disclosed. In preferred embodiments, a braid or mesh of interwoven bone bioactive glass or ceramic fibers and structural fibers is impregnated with a polymeric material to provide a composite of suitable biocompatibility and structural integrity. Most preferably, the mesh or braid is designed so that the bioactive fibers are concentrated at the surface of the implant to create a surface comprised of at least 30% bioactive material, thereby providing enhanced bone ingrowth. The interweaving between the bone bioactive glass or ceramic fibers and the core of structural fibers overcomes the problems found in prior composite systems where the bioactive material delaminates from the polymer. Preferred bioactive materials include calcium phosphate ceramics and preferred structural fibers include carbon fibers. Further preferred bioactive materials include aluminum oxide at greater than 0.2%, by mole.

Abstract: A preferred embodiment of a sulfide glass with improved mechanical and optical properties such as extended transmission in the infrared region of radiation having wavelengths of up to about 15 microns, Tg in the range of 370.degree.-550.degree. C., and thermal stability of 100.degree.-300.degree. C., containing, on mol basis, 36-72% germanium sulfide, 2-38% gallium sulfide and/or indium sulfide, and 26-62% of at least one modifier containing an alkaline earth sulfide. A process for making glass of improved mechanical and optical properties comprises the steps of mixing glass components, including an alkaline earth modifier in elemental or sulfide form; melting the glass components in an inert vessel contained in a sealed ampoule to form a molten mixture; cooling the molten glass mixture to a solid state; annealing the solid glass; and cooling the annealed glass to about room temperature.

Abstract: A glass fiber insulation product includes irregularly-shaped glass fibers of two different glasses having differing coefficients of thermal expansion, with the irregularly-shaped dual-glass fibers exhibiting a substantially uniform volume filling nature, and providing improved recovery and thermal conductivity abilities even in the absence of a binder material.

Abstract: Irregularly shaped glass fibers and insulation therefrom comprise two different glasses having differing coefficients of thermal expansion. These glasses also have physical properties which allow current processes to fabricate them into insulation. The glasses also meet German recommendations regarding a KI value of 40 or above.

Abstract: Irregularly shaped glass fibers and insulation therefrom comprise two different glasses having differing coefficients of thermal expansion. The irregularly shaped dual-glass fibers are made from wool glass compositions with the addition of at least one of BaO, SrO, K.sub.2 O, Li.sub.2 O, ZnO, TiO.sub.2 and Fe.sub.2 O.sub.3.

Abstract: The present invention relates to modified glass fiber membranes which exhibit sufficient hydrophilicity and sufficient electropositivity to bind DNA from a suspension containing DNA and permit elution of the DNA from the membrane. Generally, the hydrophilic and electropositive characteristics are expressed at the surface of the modified glass fiber membrane. Preferred modified glass fiber membranes of the present invention include glass fiber membranes that have been modified by treatment with trifluoroacetic acid (TFA), BCl.sub.3, SiCl.sub.4, NaOH, F.sup.-, AlCl.sub.3 alone or in combination, with or without water. The modified glass fiber membranes of the present invention are particularly useful in processes for purification of DNA from other cellular components.

Abstract: The present invention relates to modified glass fiber membranes which exhibit sufficient hydrophilicity and sufficient electropositivity to bind DNA from a suspension containing DNA and permit elution of the DNA from the membrane. Generally, the hydrophilic and electropositive characteristics are expressed at the surface of the modified glass fiber membrane. Preferred modified glass fiber membranes of the present invention include glass fiber membranes that have been modified by treatment with trifluoroacetic acid (TFA), BCl.sub.3, SiCl.sub.4, NaOH, F.sup.-, AlCl.sub.3 alone or in combination, with or without water. The modified glass fiber membranes of the present invention are particularly useful in processes for purification of DNA from other cellular components.

Abstract: The present invention relates to modified glass fiber membranes which exhibit sufficient hydrophilicity and sufficient electropositivity to bind DNA from a suspension containing DNA and permit elution of the DNA from the membrane. Generally, the hydrophilic and electropositive characteristics are expressed at the surface of the modified glass fiber membrane. Preferred modified glass fiber membranes of the present invention include glass fiber membranes that have been modified by treatment with trifluoroacetic acid (TFA), BCl.sub.3, SiCl.sub.4, NaOH, F.sup.-, AlCl.sub.3 alone or in combination, with or without water. The modified glass fiber membranes of the present invention are particularly useful in processes for purification of DNA from other cellular components.

Abstract: A free formed ceramic filament has a small, uniform diameter throughout and is substantially 100% dense, made from a material which exhibits a viscosity of less than 10 poise and has a physical structure that is partially amorphous with the balance, made up of complex crystals which are less than about 5 microns or substantially made up of complex crystals which are less than substantially 5 microns and has an outer surface which is substantially smooth throughout, except for a substantially linear matt surfaced line, which extends longitudinally along the outer surface of the filament.

Abstract: The present invention relates to modified glass fiber membranes which exhibit sufficient hydrophilicity and sufficient electropositivity to bind DNA from a suspension containing DNA and permit elution of the DNA from the membrane. Generally, the hydrophilic and electropositive characteristics are expressed at the surface of the modified glass fiber membrane. Preferred modified glass fiber membranes of the present invention include glass fiber membranes that have been modified by treatment with trifluoroacetic acid (TFA), BCl.sub.3, SiCl.sub.4, NaOH, F.sup.-, AlCl.sub.3 alone or in combination, with or without water. The modified glass fiber membranes of the present invention are particularly useful in processes for purification of DNA from other cellular components.

Abstract: A sulfide glass with improved mechanical and optical properties such as ended transmission in the infrared region of radiation having wavelengths of up to about 15 microns; Tg in the region of 410.degree.-550.degree. C.; and thermal stability of 100.degree.-300.degree. C. based on the difference between T.sub.g and T.sub.x, comprising, on mol basis, 20-90% germanium sulfide, 0-60% gallium sulfide, and 5-60% of at least one modifier in sulfide form. A process for improving mechanical and optical properties of a sulfide glass based on gallium sulfide and/or germanium sulfide comprises the steps of mixing glass components, including a modifier in elemental or sulfide form; melting the glass components to form a molten mixture; cooling the molten glass mixture to a solid state; annealing the solid glass; and cooling the annealed glass to about room temperature.

Abstract: Composition and process for the preparation of high temperature stable continuous glass ceramic fibers with an upper temperature use limit of 2300.degree. F. are provided. The compositional formulation, in mole percent, is 62-85% SiO.sub.2, 9.5-20% Al.sub.2 O.sub.3, 5-15.5% MgO, 0.5-5% TiO.sub.x, and 0-5% ZrO.sub.2. The continuous fibers are prepared by an economical direct melt method, and demonstrate high tensile strength, high Young's modulus, and low linear thermal shrinkage characteristics.

Abstract: A fiberizable mineral composition which is thermostable and has a high dissolution rate in biological fluids includes 53.5-64 w/w % of SiO.sub.2, up to 4 w/w % of Al.sub.2 O.sub.3, 10-20 w/w % of CaO, 10-20 w/w % of MgO, and 6.5-9 w/w % of FeO, the total amount of FeO and Fe.sub.2 O.sub.3 calculated as FeO. A mineral fiber material made from the composition can be used for thermal and/or acoustic insulation purposes or as a plant growing medium or substrate.

Abstract: A reinforcing composition is provided comprising pellets produced by the process of hydrating glass fibers to achieve a water content on the glass fibers of from about 11 weight percent to about 20 weight percent, mixing the glass fibers for at least about three minutes, thereby forming pellets, and drying.

Abstract: Irregularly-shaped glass fibers and insulation therefrom comprising two different glasses having differing coefficients of thermal expansion. The irregularly-shaped dual-glass fibers exhibit a substantially uniform volume filling nature, and provide improved recovery and thermal conductivity abilities even in the absence of a binder material.

Abstract: A fine silica tube composed of silica gel and having an outer diameter of 0.05 to 2 .mu.m wherein the cylindrical wall portion of the tube has a cross-section defined by a substantially square outer periphery and a substantially square vacant center, or by a circular outer periphery and a substantially square vacant center; and a fine silica tube composed of silica glass and having an outer diameter of 0.05 to 1.4 .mu.m wherein the cylindrical wall portion of the tube has a cross-section defined by a substantially square outer periphery and a substantially square vacant center. The fine silica gel tube is made by treating a tetraalkoxysilane with ammonia or aqueous ammonia in a water-soluble alcohol medium in the presence of tartaric acid, citric acid, a tartaric acid salt or a citric acid salt, whereby the tetraalkoxysilane is hydrolyzed. The fine silica glass tube is made by calcining the fine silica gel tube at 800.degree. to 1,400.degree. C.

Abstract: Composition and process for the preparation of high temperature stable continuous glass ceramic fibers with an upper temperature use limit of 2300.degree. F. are provided. The compositional formulation, in mole percent, is 62-85% SiO.sub.2, 9.5-20% Al.sub.2 O.sub.3, 5-15.5% MgO, 0.5-5% TiO.sub.x, and 0-5% ZrO.sub.2. The continuous fibers are prepared by an economical direct melt method, and demonstrate high tensile strength, high Young's modulus, and low linear thermal shrinkage characteristics.

Abstract: The invention relates to fiber structures in the form of refractory light-weight moldings. These fiber structures exhibit the advantage that they do not contain, or contain virtually no harmful fibers, and/or that such fibers that might still exist in the fiber structures can be readily decomposed by water or body fluids. Nevertheless, the fiber structures exhibit the advantageous thermal and mechanical properties of conventional light-weight moldings. The fiber structures according to the invention are manufactured using inorganic fibers, wherein at least 90% by weight of each fiber comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3. The rest comprises a maximum of 10% by weight of typical impurity oxides. Water or a water-containing liquid is used as the charge liquid, and conventional refractory additives may also be added to the mixture of fibers and water to be molded.

Abstract: Fiberizable glass composition with increased levels of BaO are suitable for insulation. These glasses have physical properties which allow current processes to fabricate them into insulation. The glasses also meet proposed German regulations regarding KI.gtoreq.40.

Abstract: Fiberizable glass composition with increased levels of B.sub.2 O.sub.3 and Na.sub.2 O are suitable for insulation. Coupled with alumina levels as high as possible, these glasses have improved durability. Moreover, these glasses have physical properties which allow current processes to fabricate them into insulation. The glasses also meet proposed German regulations regarding Kl.gtoreq.40.

Abstract: An improved fiber reinforced glass composite includes a carbon-coated refractory fiber in a matrix of a black glass ceramic having the empirical formula SiCxOy where x ranges from about 0.5 to about 2.0, preferably 0.9 to 1.6 and y ranges from about 0.5 to 3.0, preferably 0.7 to 1.8. Preferably the black glass ceramic is derived from cyclosiloxane monomers containing a vinyl group attached to silicon and/or a hydride-silicon group.

Abstract: A fiber reinforced ceramic composite material exhibiting high tensile strength, high fracture toughness and high-temperature oxidation resistance is produced by simultaneously depositing a thin coating layer of refractory metal carbide with fugitive carbon onto the fiber reinforcement prior to the subsequent densification with the ceramic matrix. The energy behind propagating matrix cracks in the resulting composite material are effectively dissipated by crack deflection/branching, fiber debonding and frictional slip through the relatively weak and compliant fiber coating layer. These energy release and arrest mechanisms sufficiently impede the driving force behind unstable crack propagation and render the cracks non-critical, thereby serving to blunt and/or divert propagating matrix cracks at or around the reinforcing fiber.

Abstract: An improved fiber reinforced glass composite includes refractory fiber in a matrix of a black glass ceramic having the empirical formula SiCxOy where x ranges from about 0.5 to about 2.0, preferably 0.9 to 1.6 and y ranges from about 0.5 to 3.0, preferably 0.7 to 1.8. Preferably the black glass ceramic is derived from cyclosiloxane monomers containing a vinyl group attached to silicon and/or a hydride-silicon group.

Abstract: A ceramic composition having a high value .epsilon.r while maintaining Qu and .tau.f each in a range of practical characteristic. The present invention is applicable to dielectric resonators and impedance matching of various kinds of microwave circuits. The ceramic composition comprises Ba.sub.1-x Sr.sub.x (Zn.sub.1/3 Nb.sub.2/3)O.sub.3 (in which 0.6.ltoreq..times..ltoreq.1.0) as the main ingredient, to which TiO.sub.2 is incorporated by 0.01 to 1 parts by weight based on 100 parts by weight of the main ingredient. The ceramic composition may have a Qu value of 2000 to 2900 (at 4.5 GHz), relative dielectric constant of 39 to 42, and a temperature constant of resonance frequency (.tau.f) in the range of -8 to +10 ppm/.degree.C. The ceramic composition may not contain Sr.sub.5 Nb.sub.4 O.sub.15 or Ba.sub.4 Nb.sub.2 O.sub.9. It may index for the regularity of the B site ingredient of 7-9.times.10.sup.-2.

Abstract: The present invention relates to modified glass fiber membranes which exhibit sufficient hydrophilicity and sufficient electropositivity to bind DNA from a suspension containing DNA and permit elution of the DNA from the membrane. Generally, the hydrophilic and electropositive characteristics are expressed at the surface of the modified glass fiber membrane. Preferred modified glass fiber membranes of the present invention include glass fiber membranes that have been modified by treatment with trifluoroacetic acid (TFA), BCl.sub.3, SiCl.sub.4, NaOH, F.sup.-, AlCl.sub.3 alone or in combination, with or without water. The modified glass fiber membranes of the present invention are particularly useful in processes for purification of DNA from other cellular components.

Abstract: A bone grafting material for use in medicine is glass wool which has the mean diameter of 100 .mu.m or less and whose composition is:SiO.sub.2 40-62% (w/w)Na.sub.2 O 10-32% (w/w)CaO 10-32% (w/w)P.sub.2 O.sub.5 0-12% (w/w)CaF.sub.2 0-12% (w/w)B.sub.2 O.sub.3 0-20% (w/w),When the grafting material is used for treatment of periodontal disease, the grafting material is completely replaced by newly formed bone, whereby dental ankylosis of the grafting material to a tooth root does not occur and the newly formed bone and the tooth root are bound with a tissue like a periodontal membrane.

Abstract: The invention provides a process which makes it possible to regulate the degree of oxidation-reduction of a glass during its production. According to the invention, which relates to glasses intended to be transformed into continuous or staple fibers containing at most about 1% by weight of Fe.sub.2 O.sub.3, the degree of oxidation of the glass is obtained by incorporating in the mixture of vitrifiable products at least two oxidizing agents, one of them being an inorganic nitrate, the other being, according to preference, an oxidized compound of manganese in which the oxidation state of the manganese is greater than 2, potassium dichromate and/or ceric oxide. The invention particularly favors the recycling of waste from products with a glass fiber base in the vitrifiable mixture.

Abstract: A glass fiber forming composition exhibits a remarkably high dielectric constant .epsilon..sub..GAMMA. as well as superior chemical resistance, yet it is readily spun into glass fibers. The composition is characterized to show a devitrification temperature which is lower than a spinning temperature at which the glass composition exhibits a viscosity of 10.sup.2.5 poise, so as to be readily spun into corresponding glass fibers. The composition consists essentially of 40 to 65 mol % of SiO.sub.2 ; 20 to 45 mol % of at least one component selected from the group consisting of MgO, CaO, SrO and BaO; 5 to 25 mol % of at least one component selected from the group consisting of TiO.sub.2 and ZrO.sub.2 ; and 0.5 to 15 mol % of NbO.sub.5/2 as calculated from an incorporated amount of Nb.sub.2 O.sub.5. Alternately, the composition consist essentially of 40 to 65 mol % of SiO.sub.

Abstract: Described is an inorganic fiber comprising silica dioxide, calcium oxide, and alkali oxide having a free energy of hydration greater than (more positive than) -5.00 kcal/mol, an enthalpy of formation less than (more than negative than) -210.0 kcal/mol, a dissolution rate in simulated extra cellular fluid greater than 750 (calculated as nanograms of fiber/per square centimeter of fiber surface area/per hour) having an average fiber diameter not greater than 4.5 micrometers. Also described is a method of manufacturing the fibers.

Abstract: This invention is directed broadly to transparent glasses exhibiting excellent transmission far into the infrared region of the electromagnetic radiation spectrum, those glasses consisting essentially, expressed in terms of mole percent, of 40-80% Ga.sub.2 S.sub.3, 0-35% RS.sub.x, wherein R is at least one network forming cation selected from the group consisting of aluminum, antimony, arsenic, germanium, and indium, 1-50% Ln.sub.2 S.sub.3, wherein Ln is at least one cation selected from the group consisting of a rare earth metal cation and yttrium, 1-45% MS.sub.x, wherein M is at least one modifying metal cation selected from the group consisting of barium, cadmium, calcium, lead, lithium, mercury, potassium, silver, sodium, strontium, thallium, and tin, and 0-10% total chloride and/or fluoride. Glass compositions consisting essentially, expressed in terms of mole percent, of 5-30% Ga.sub.2 S.sub.3, 0-10% R.sub.2 S.sub.

Abstract: The invention provides a process which makes it possible to regulate the degree of oxidation-reduction of a glass during its production.According to the invention, which relates to glasses intended to be transformed into continuous or staple fibers containing at most about 1% by weight of Fe.sub.2 O.sub.3, the degree of oxidation of the glass is obtained by incorporating in the mixture of vitrifiable products at least two oxidizing agents, one of them being an inorganic nitrate, the other being, according to preference, an oxidized compound of manganese in which the oxidation state of the manganese is greater than 2, potassium dichromate and/or ceric oxide.The invention particularly favors the recycling of waste from products with a glass fiber base in the vitrifiable mixture.

Abstract: A glass fiber forming composition exhibits a remarkably high dielectric constant .epsilon..sub.r as well as superior chemical resistance, yet it is readily spun into glass fibers. The composition is characterized to show a devitrification temperature which is lower than a spinning temperature at which the glass composition exhibits a viscosity of 10.sup.2.5 poise, so as to be readily spun into corresponding glass fibers. The composition consists essentially of 40 to 65 mol % of SiO.sub.2 ; 20 to 45 mol % of at least one component selected from the group consisting of MgO, CaO, SrO and BaO; 5 to 25 mol % of at least one component selected from the group consisting of TiO.sub.2 and ZrO.sub.2 ; and 0.5 to 15 mol % of NbO.sub.5/2 as calculated from an incorporated amount of Nb.sub.2 O.sub.5. Alternately, the composition consist essentially of 40 to 65 mol % of SiO.sub.

Abstract: Glass fibres which are distinguished by their greatly reduced carcinogenicity have an average fibre diameter of <8 .mu.m, preferably <3 .mu.m, with more than 10% of the fibres having a diameter of <3 .mu.m. The types of glass used for producing these fibres are characterized by containing the following compounds in the proportions shown in mol %:______________________________________ SiO.sub.2 55-70 B.sub.2 O.sub.3 0-4 Al.sub.2 O.sub.3 0-1 TiO.sub.2 0-6 Iron oxides 0-2 MgO 0-5 CaO 12-20 Na.sub.2 O 10-20 K.sub.2 O 0-5 fluoride 0-2.

Abstract: This invention relates to a fiberizable glass compositions consisting essentially, expressed in terms of mole percent on the oxide basis, of at least 65% total of 5-55% ZnO, 28-40% P.sub.2 O.sub.5, 0.3-5% MoO.sub.3 and 10-35% R.sub.2 O, wherein R.sub.2 O consists of at least two alkali metal oxides in the indicated proportions selected from the group consisting of 0-25% Li.sub.2 O, 0-25% Na.sub.2 O, and 0-25% K.sub.2 O, and up to 35% total of optional ingredients in the indicated proportions selected from the group consisting of 0-10% Al.sub.2 O.sub.3, 0-15% B.sub.2 O.sub.3, 0-15% Al.sub.2 O.sub.3 +B.sub.2 O.sub.3, 0-15% Cu.sub.2 O, 0-25% Sb.sub.2 O.sub.3 0-5% F, 0-35% PbO, 0-35% SnO, 0-35% PbO+SnO, 0-5% ZrO.sub.2, 0-4% SiO.sub.2, 0-20% MgO+CaO+SrO+BaO+MnO, 0-20% MgO, 0-20% CaO, 0-20% SrO, 0-20% BaO and 0-10% MnO, and 0-5% rare earth metal oxide.

Abstract: An inorganic fiber sinter consists essentially of (a) an inorganic substance (I) selected from the group consisting of (i) an amorphous substance consisting essentially of Si, M, C and O, (ii) an agglomerate consisting essentially of crystalline ultrafine particles of .beta.-SiC, MC, a solid solution of .beta.-SiC with MC and/or MC.sub.1-x, and amorphous SiO.sub.2 and MO.sub.2, and (iii) a mixture of the above amorphous substance (i) and the agglomerate (ii), and (b) an inorganic substance (II) selected from the group consisting of (iv) an amorphous substance consisting essentially of Si, M and O, (v) a crystal agglomerate consisting essentially of crystalline SiO.sub.2 and MO.sub.2, and (iv) a mixture of the amorphous substance (iv) and the crystal agglomerate (v), wherein M is Ti or Zr and x is a number of more than 0 to less than 1.

Abstract: A composite material having a fiber system embedded in a host matrix material. The fiber system has a protective reaction barrier around the embedded fibers to prevent deleterious chemical or mechanical reaction between the fiber and matrix. The fiber coating is applied by immersion of the fiber system into an alkoxide solution of the desired oxide precursor with controlled immersion and withdrawal rates with subsequent drying, heating to convert to a pure oxide state, and where required, post processing, to convert the oxide coating to a carbide or nitride, for example.

Abstract: A glass fiber forming composition exhibits a remarkably high dielectric constant .epsilon..sub.r as well as superior chemical resistance, yet it is readily spun into glass fibers. The composition is characterized to show a devitrification temperature which is lower than a spinning temperature at which the glass composition exhibits a viscosity of 10.sup.2.5 poise, so as to be readily spun into corresponding glass fibers. The composition consists essentially of 40 to 65 mol % of SiO.sub.2 ; 20 to 45 mol % of at least one component selected from the group consisting of MgO, CaO, SrO and BaO; 5 to 25 mol % of at least one component selected from the group consisting of TiO.sub.2 and ZrO.sub.2 ; and 0.5 to 15 mol % of NbO.sub.5/2 as calculated from an incorporated amount of Nb.sub.2 O.sub.5. Alternately, the composition consist essentially of 40 to 65 mol % of SiO.sub.

Abstract: Highly heat resistant glass fiber which comprises from 0.1 to 2.0 wt % of Al.sub.2 O.sub.3, from 0.1 to 2.0 wt % of TiO.sub.2, from 96 to 99.8 wt % of SiO.sub.2 and not more than 0.03 wt % of the sum of alkali metal oxides and alkaline earth metal oxides.

Abstract: The present invention relates to ceramic fibers of the Si-C-N-O series with a diameter less than about 20 micrometers. It has been unexpectedly found that the thermal stability of these fibers can be increased by minimizing the impurity content, primarily the content of metals or metallic compounds. Such fibers with low levels of contaminants retain greater than about 60 percent of their initial tensile strength when subjected to temperatures of 1300.degree.-1400.degree. C. for at least 30 minutes in a non-oxidative environment.

Abstract: A process for preparing an improved durable glass composition is described. In the first step of the process, a glass batch containing from 40 to 80 mole percent of phosphorous and from 3 to 40 mole percent of iron is provided. In the second step of the process, the glass batch is melted under an enriched oxygen atmosphere.

Abstract: A separator substantially comprising only alkali-containing glass fibers with an average fiber diameter of less than 2 .mu.m, and having an electrolyte dripping speed of lower than 80 mm/hr and a content of sulfer S at the surface of the glass fibers of less than 0.02% by weight, as well as a sealed lead acid battery using such a separator.

Abstract: Improved inorganic ceramic papers comprising heterogeneous grades of ceramic fibers, namely small, high surface area fibers and at least one larger, lower surface area ceramic fiber are bonded into a matrix with the aid of an inorganic binder system having at least one metal oxide with an average particle size below 200 nm. Multiple different grades of inorganic ceramic fibers and small particle size inorganic binders impart good tensile strength and flexibility characteristics in the same sheet.

Abstract: Glass compositions useful for forming fibers which are readily able to be degraded in a physiological medium such as that found in a human body. Advantageous compositions formed according to the present invention comprise the following components, set forth in percent by weight:SiO.sub.2 : 57 to 70%Al.sub.2 O.sub.3 : 0 to 5%CaO: 5 to 10%MgO: 0 to 5%Na.sub.2 O+K.sub.2 O: 13 to 18%B.sub.2 O.sub.3 : 2 to 12%F: 0 to 1.5%P.sub.2 O.sub.

Abstract: A shaped silicon carbide-based ceramic article having an improved mechanical strength is produced at a high efficiency by a process comprising the step of: forming an organic silicone polymer, for example, polycarbosilastyrene copolymer, into a predetermined shape, for example, a filament or film; doping the shaped polymer with a doping material consisting of at least one type of halogen, for example, bromine or iodine, in an amount of 0.01% to 150% based on the weight of the shaped polymer, to render the shaped polymer infusible; and pyrolyzing the infusible shaped polymer into a shaped SiC-based ceramic article at a temperature of 800.degree. C. to 1400.degree. C. in an inert gas atmosphere, optionally the halogen-doped shaped polymer being treated with a basic material, for example, ammonia, before the pyrolyzing step, to make the filament uniformly infusible.

Abstract: The process comprises the steps of forming a fibrous reinforcement with silicium carbide fibers, forming on the fibers an intermediate coating designed to constitute an interface between the fibers and a matrix, and forming a matrix in ceramic material within the residual porosity of the fibrous reinforcement. In a step prior to the formation of the intermediate coating, a treatment is carried out by the chemical route for the elimination of the silica present on the surface of the silicium carbide fibers.

Abstract: An alkali-resistant glass for forming glass fibers having the composition: 54 to 65 wt. % SiO.sub.2, 18 to 25 wt. % ZrO.sub.2, 0 to 5 wt. % Li.sub.2 O, 10 to 7 wt. % Na.sub.2 O, 0.5 to 8 wt. % K.sub.2 O, 0 to 10 wt. % RO where R represents Mg, Ca, Sr, Ba, or Zn, 0.5 to 7 wt. % TiO.sub.2, and 0 to 2 wt. % Al.sub.2 O.sub.3, which glass composition is free or substantially free from F.sub.2.

Abstract: Based on the discovery that Al.sub.2 O.sub.3 strongly retards the dissolving rate of insulating glass fibers in a synthetic lung solution, glass fibers having low alumina contents have been identified that dissolve significantly faster in lung fluid. Moreover, these glass fibers still have adequate durability for insulation pruposes and have physical properties which allow current processes to fabricate them into insulation.

Abstract: A process for producing mineral fibers and the fibers thus produced are disclosed. The process involves forming a melt comprising an alumina-containing residue from a metal melting operation and one or more mineral raw materials suitable for forming mineral fibers, dividing the melt into streams and cooling the streams to produce the fibers. The residue from the metal melting operation acts as an inexpensive, substantially non-polluting source of alumina which can be used to increase the alumina content of the fibers and thus improve their properties, or which can be used as a replacement for more expensive or less desirable sources of alumina.

Abstract: The present invention relates to mineral fiber compositions useful for forming fibers which are readily degraded in a physiological medium such as that found within the human body. Advantageous compositions formed according to the present invention comprise the following components in the proportions by weight set forth below:______________________________________ SiO.sub.2 37 to 58 wt. %; Al.sub.2 O.sub.3 4 to 14 wt. %; CaO 7 to 40 wt. %; MgO 4 to 16 wt. %; P.sub.2 O.sub.5 1 to 10 wt. %; Fe.sub.2 O.sub.3 up to about to 15 wt. %: ______________________________________wherein the amount of CaO+MgO+Fe.sub.2 O.sub.3 is greater than 25% and the total amount of Na.sub.2 O+K.sub.2 O is less than 7%. The total iron contained within the composition is expressed in the form of ferric oxide (Fe.sub.2 O.sub.3).