The present invention is an annealed quartz glass cloth that has an SiO.sub.2 content of 99.5 mass % or more, a dielectric loss tangent of less than 0.0010 at 10 GHz, and a tensile strength of 1.0 N/25 mm or more per cloth weight (g/m.sup.2). This provides an annealed quartz glass cloth that has a low dielectric loss tangent and that is also excellent in tensile strength; and a method for manufacturing an annealed quartz glass cloth by which strength recovers after a high-temperature heat treatment.

An optical fiber having a coating that includes a photoreactive marking compound is described. The photoreactive marking compound has two states that differ in the intensity and/or wavelength of fluorescence. Exposure of the photoreactive marking compound to electromagnetic radiation induces a transformation of the photoreactive marking compound from one state to the other state. The difference in fluorescence between the two states provides a detectable contrast that can be used to mark the optical fiber. A pattern of marks can be customized to different optical fibers to provide unambiguous identification of individual fibers. The coating may also include a pigment, where either or both of the pigment and photoreactive marking compound may function as a marker for identifying the optical fiber. The method extends generally to marking of films, coatings, and articles made of polymers or plastics.

Described herein is a method of using glass fibers having a tensile strength according to DIN ISO 527-5 of 86.0 to 92.0 GPa, a tensile elastic modulus according to DIN ISO 527-5 of 2600 to 3200 MPa and a softening point according to DIN ISO 7884-1 of 900° C. to 950° C., the method including using the glass fibers to increase an impact strength and/or breaking elongation of molded articles made of molding materials including thermoplastic polyamides and elastomers.

An inorganic material including SiO.sub.2, Al.sub.2O.sub.3, CaO, and Fe.sub.2O.sub.3 as components, in which the mass percentages of the components in terms of oxide in the inorganic material are set as follows: i) the total content of SiO.sub.2 and Al.sub.2O.sub.3 is from 40% by mass to 70% by mass; ii) the ratio Al.sub.2O.sub.3/(SiO.sub.2+Al.sub.2O.sub.3) (mass ratio) is in the range of 0.15 to 0.40; iii) the content of Fe.sub.2O.sub.3 is from 16% by mass to 25% by mass; and iv) the content of CaO is from 5% by mass to 30% by mass, can be produced as an inorganic material having excellent melt spinnability and excellent radiation resistance.

An alkali-free ultrafine glass fiber formula includes the following components, in mass percentage calculated based on 100 Kg: SiO2: 50% to 65%, Al.sub.2O.sub.3: 10% to 16.5%, CaO: 17% to 28%, MgO: 0.2% to 4.0%, Na.sub.2O and K.sub.2O: 0.1% to 0.8% in total, CeO.sub.2: 0.1% to 0.5%, Li.sub.2O: 0.1% to 0.7%, Fe.sub.2O.sub.3: 0.05% to 0.6%, TiO.sub.2: 0.1% to 1%, and impurities: the balance. In the preparation of alkali-free ultrafine glass fibers, no fluorine and boron-containing raw materials are used, and CeO.sub.2 and Li.sub.2O are introduced, which avoids the use of B.sub.2O.sub.3 and F that have a large impact on the environment, and reduces environmental pollution. A single fiber strength of prepared glass fibers is about 9% higher than that of the traditional E glass fibers, and the comprehensive performance of a prepared glass fiber product is significantly superior than that of the existing E glass fiber product.

A glass composition and a glass fiber made thereof have a low thermal expansion coefficient and include a main material, a fluxing material and a reinforcing material. The main material includes silicon dioxide having a percentage by weight of 55%-66% of the glass composition. The reinforcing material includes aluminum oxide having a percentage by weight of 10%-20% of the glass composition. The fluxing material includes magnesium oxide, zinc oxide, and titanium dioxide. The percentage by weight of magnesium oxide is 3%-12% of the glass composition, the percentage by weight of zinc oxide is 0.01%-7% of the glass composition, and the percentage by weight of titanium dioxide is 0.01%-6% of the glass composition. By adding zinc oxide and titanium dioxide, the thermal expansion coefficient of the glass composition can be lowered.

Disclosed are a glass fiber tape, a surface modification method and an application thereof. The surface modification method includes the determination of an optimal decarburizing condition of the glass fiber tape, the decarburization of the glass fiber tape, and the coating of palmitic acid.

The technology of this application relates to the field of communication technologies, and an optical fiber raw material composition, an optical fiber, and an optical fiber product. The optical fiber raw material composition includes components of the following molar percentages: AlF.sub.3 10%-50%, BaF.sub.2 3%-20%, CaF.sub.2 3%-20%, YF.sub.3 1%-15%, SrF.sub.2 3%-20%, MgF.sub.2 3%-20%, and TeO.sub.2 1%-35%. The optical fiber prepared by using the optical fiber raw material composition provided in this disclosure can be used in aspects such as a mid-infrared band transmission optical fiber, an optical fiber amplifier, a fiber laser, and an optical fiber sensor.

A composition for producing a glass fiber, including the following components with corresponding percentage amounts by weight: SiO.sub.2: 57.4-60.9%; Al.sub.2O.sub.3: greater than 17% and less than or equal to 19.8%; MgO: greater than 9% and less than or equal to 12.8%; CaO: 6.4-11.8%; SrO: 0-1.6%; Na.sub.2O+K.sub.2O: 0.1-1.1%; Fe.sub.2O.sub.3: 0.05-1%; TiO.sub.2: lower than 0.8%; and SiO.sub.2+Al.sub.2O.sub.3: lower than or equal to 79.4%. The total weight percentage of the above components in the composition is greater than 99%. The weight percentage ratio of Al.sub.2O.sub.3+MgO to SiO.sub.2 is between 0.43 and 0.56, and the weight percentage ratio of CaO+MgO to SiO.sub.2+Al.sub.2O.sub.3 is greater than 0.205. The composition can significantly increase the glass modulus, effectively reduce the glass crystallization rate, secure a desirable temperature range (ΔT) for fiber formation and enhance the refinement of molten glass, thus making it particularly suitable for high performance glass fiber production with refractory-lined furnaces.

Glass compositions and glass fibers having low dielectric constants and low dissipation factors that may be suitable for use in electronic applications and articles are disclosed. The glass fibers and compositions of the present invention may include between 48.0 to 57.0 weight percent SiO.sub.2; between 15.0 and 26.0 weight percent B.sub.2O.sub.3; between 12.0 and 18.0 weight percent Al.sub.2O.sub.3; between 3.0 and 8.0 weight percent P.sub.2O.sub.5; between 0.25 and 7.00 weight percent CaO; 5.0 or less weight percent MgO; and 6.0 or less weight percent TiO.sub.2. Further, the glass composition has a glass viscosity of 1000 poise at a temperature greater than 1350 degrees Celsius and a liquidus temperature greater than 1100 degrees Celsius.