Abstract: A high-magnesium glass fiber composition with high specific modulus and a glass fiber is provided. The glass fiber composition includes the following contents of components in percentage by mass: 58.5-63.0% of SiO2, 15.0-20.0% of Al2O3, 0.3-2.5% of CaO, 16.0-19.5% of MgO, 0.2-0.6% of Fe2O3, 1.0-3.5% of Y2O3 and B2O3, 0.1-1.0% of B2O3, and 0.3-0.8% of K2O and Na2O. The glass fiber composition has a density of less than 2.610 g/cm3, and the glass fiber has an elasticity modulus of equal to or greater than 94.0 GPa and a specific modulus of equal to or greater than 3.67*106 m.

Abstract: The disclosure belongs to the technical field of glass fibers, and specifically relates to a glass fiber composition with low dielectric loss. The content of each component of the composition is as follows: 50-60% of SiO2; 20-30% of B2O3; 8-18% of Al2O3; 1-6% of CaO; 0.2-1.50% of F2; 0.05-0.5% of SnO2; 0.05-0.5% of Li2O; and K2O+Na2O?0.05%. In the disclosure, SnO2 and F2 are both added, and the ratio of F2/SnO2 is controlled, such that not only glass fibers have relatively low dielectric constant and dielectric loss, but also the viscosity of the glass fibers is reduced, so that the number of bubbles in the glass fibers is zero. According to the disclosure, various components interact with one another, such that the glass fiber composition obtained has the low dielectric constant, low dielectric loss, few bubbles, low viscosity, and excellent glass performance.

Abstract: The present invention discloses a low thermal expansion coefficient glass fiber, belonging to the technical field of glass fibers. The glass fiber of the present invention is composed of the following ingredients: SiO2 55.0-63.0%, Al2O3 17.5-25.0%, MgO 9.0-16.5%, B2O3 2.0-9.0%, ZnO 0.1-4.5%, TiO2 0.1-4.0%, ZrO2 0.1-3.0%, HO2 0.1-2.0%, and Li2O 0.1-2.0%, where the sum of the contents of TiO2, ZrO2, and HO2 is 1.0-5.0%. According to the low expansion coefficient glass fiber of the present invention, CaO, K2O, and Na2O ingredients are not added, but B2O3, ZnO, TiO2, ZrO2, and HfO2 are simultaneously added, and the proportion of each element is optimized, significantly decreasing the expansion coefficient of the glass fiber in the present invention. The expansion coefficient of the glass fiber in the present invention is as low as 2.77×10?6/° C.

Abstract: A high-modulus glass fiber composition based on basalt includes components with contents in mass percentage satisfying SiO2: 53.0%-60.0%; Al2O3: 24.5%-28.0 %; MgO: 8%-15.0%; Fe2O3: 1.5%-5.5%; TiO2: 2.0%-4.0%; 0<CaO?5.0%; and 0<Na2O+K2O?2.0%.

Abstract: A high-modulus glass fiber composition based on basalt includes components with contents in mass percentage satisfying SiO2: 53.0%-60.0%; Al2O3: 24.5%-28.0%; Al2O3: 8.0%-15.0%; Fe2O3:1.5%-5.5%; TiO2: 2.0%-4.0%; 0<CaO?5.0%; and 0<Na2O+K2O?2.0%.

Abstract: A high-intensity and high-modulus glass fiber is provided. Said fiber is produced by improving the processes, components and proportion of conventional E-glass production process and apparatus. The fiber contains 13% CaO at most, no boron and fluorine, meanwhile ZrO2 and Li2O is first added, B2O3 is first removed, and SO3 is added. The intensity and the modulus of the fiber are slightly lower than those of S-glass or T-glass, but obviously higher than those of E-glass and ECR-glass which are highly produced and widely used or other boron-free glass such as Advantex glass. Besides the intensity, modulus and fatigue resistance, said fiber has obvious advantages over E-glass in heat, acid and alkali resistance. The glass fiber roving made from said fiber has 22% higher tensile strength and 11˜15.7% higher modulus than those of E-glass, and has 16% higher tensile strength and 5˜6% higher modulus than those of ECR-glass.

Abstract: A high-intensity and high-modulus glass fiber is provided. Said fiber is produced by improving the processes, components and proportion of conventional E-glass production process and apparatus. The fiber contains 13% CaO at most, no boron and fluorine, meanwhile ZrO2 and Li2O is first added, B2O3 is first removed, and SO3 is added. The intensity and the modulus of the fiber are slightly lower than those of S-glass or T-glass, but obviously higher than those of E-glass and ECR-glass which are highly produced and widely used or other boron-free glass such as Advantex glass. Besides the intensity, modulus and fatigue resistance, said fiber has obvious advantages over E-glass in heat, acid and alkali resistance. The glass fiber roving made from said fiber has 22% higher tensile strength and 11˜15.7% higher modulus than those of E-glass, and has 16% higher tensile strength and 5˜6% higher modulus than those of ECR-glass.