An energy absorption member (21) includes a hollow cylindrical fiber-reinforced composite material including reinforcement fibers (22), in which tensile strength S (GPa), tensile modulus of elasticity M (GPa), and elongation rate E (%) satisfy the following expression (1), and a curable resin composition with which the reinforcement fibers (22) are impregnated. The volume content of the reinforcement fibers (22) in the fiber-reinforced composite material is 30 to 80%.
11.0≤S.sup.2×M.sup.1/8/E.sup.1/2≤22.0  (1)

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 58.0 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 greater than 0.25 and 3.0 weight percent P.sub.2O.sub.5; between greater than 0.25 and 7.00 weight percent CaO; 5.0 or less weight percent MgO; between greater than 0 and 1.5 weight percent SnO.sub.2; 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 1000 degrees Celsius.

The invention discloses a borosilicate glass with high chemical resistance and an application thereof. The borosilicate glass contains 0.25-4.0 wt % of Y.sub.2O.sub.3 based on the oxide. The borosilicate glass has a high chemical stability, a suitable linear thermal expansion coefficient and is suitable for use in the field of pharmaceutical packaging materials.

A borate glass includes from 25.0 mol % to 70.0 mol % B.sub.2O.sub.3; from 0.0 mol % to 10.0 mol % SiO.sub.2; from 0.0 mol % to 15.0 mol % Al.sub.2O.sub.3; from 3.0 mol % to 15.0 mol % Nb.sub.2O.sub.5; from 0.0 mol % to 12.0 mol % alkali metal oxides; from 0.0 mol % to 5.0 mol % ZnO; from 0.0 mol % to 8.0 mol % ZrO.sub.2; from 0.0 mol % to 15.0 mol % TiO.sub.2; less than 0.5 mol % Bi.sub.2O.sub.3; and less than 0.5 mol % P.sub.2O.sub.5. The optical borate glass includes a sum of B.sub.2O.sub.3+Al.sub.2O.sub.3+SiO.sub.2 from 35.0 mol % to 76.0 mol %, a sum of CaO+MgO from 0.0 mol % to 35.5 mol %. The borate glass has a refractive index, measured at 587.6 nm, of greater than 1.70, a density of less than 4.50 g/cm.sup.3, and an Abbe number, V.sub.D, from 20.0 to 47.0.

Glass compositions suitable for fiber forming having low levels of Li.sub.2O and glass fibers having high-modulus are disclosed. The glass composition may include SiO.sub.2 from about 59 to about 63 weight percent, Al.sub.2O.sub.3 from about 13.7 to about 16 weight percent, CaO from about 14 to about 16.5 weight percent, MgO from about 6 to about 8.5 weight percent, Fe.sub.2O.sub.3 less than 1 weight percent, and TiO.sub.2 less than 1 weight percent. In some cases, the composition may be substantially free of Li.sub.2O. In some cases, the composition may include Li.sub.2O up to 0.5 weight percent. In some cases, RE.sub.2O.sub.3 may be present in the composition in an amount up to 1.5 weight percent. The glass compositions can be used to form glass fibers which can be incorporated into a variety of other fiber glass products (e.g., strands, rovings, fabrics, etc.) and incorporated into various composites.

Provided is a composition for a glass fiber which has a high elastic modulus and satisfactory productivity, and can facilitate the production of a fine-count glass fiber. The composition for a glass fiber of the present invention includes, as a glass composition expressed as a mass percent in terms of oxide, 50% to 70% of SiO.sub.2, 15% to 25% of Al.sub.2O.sub.3, 3% to 13% of MgO, 3% to 15% of CaO, and 0.5% to 5% of B.sub.2O.sub.3.

The present invention discloses a glass with high refractive index for fiber optic imaging elements with medium-expansion and fabrication method therefor, the glass comprising the following components in percentage by weight: SiO.sub.2 5-9%, Al.sub.2O.sub.3 0-1%, B.sub.2O.sub.3 23-28%, CaO 0-3%, BaO 6-12%, La.sub.2O.sub.3 30-34%, Nb.sub.2O.sub.5 4-8%, Ta.sub.2O.sub.5 0-1%, Y.sub.2O.sub.3 0-1%, ZnO 4-9%, TiO.sub.2 4-8%, ZrO.sub.2 4-6%, SnO.sub.2 0-1%. The present invention further provides a fabrication method for the glass with a high refractive index, comprising: putting raw materials quartz sand, aluminum hydroxide, boric acid or boric anhydride, calcium carbonate, barium carbonate or barium nitrate, lanthanum oxide, niobium oxide, tantalum oxide, yttrium oxide, zinc oxide, titanium dioxide, zirconium oxide and stannic oxide, etc. into a platinum crucible according to the requirement of dosing, melting at a high temperature, cooling and fining, leaking and casting to form a glass rod, and then annealing, cooling and chilling the molded glass rod.

The present disclosure relates to compositions that can be used for optical fibers and other systems that transmit light in the near-, mid- and/or far-ranges of the infrared spectrum, such as for example in the wavelength range of 1.5 μm to 14 μm. The optical fibers may comprise a light-transmitting chalcogenide core composition and a cladding composition. In some embodiments, the light-transmitting chalcogenide core composition has a refractive index n(core) and a coefficient of thermal expansion CTE(core), and the cladding composition has a refractive index n(cladding) and a coefficient of thermal expansion CTE(cladding), wherein n(cladding) is less than n(core) and in some embodiments wherein CTE(cladding) is less than CTE(core). In some embodiments, the chalcogenide glass core composition comprises a) sulfur and/or selenium, b) germanium, and c) gallium, indium, tin and/or one or more metal halides.

According to various embodiments, a composition for preparing glass fibers comprises from about 58 wt. % to about 69 wt. % SiO.sub.2, from about 8 wt. % to about 15 wt. % RO, wherein RO is a total amount of MgO and CaO, from about 12 wt. % to about 18 wt. % R.sub.2O, wherein R.sub.2O is a total amount of Na.sub.2O and K.sub.2O, up to about 2 wt. % of a single oxidizing agent, and Fe.sub.2O.sub.3 and FeO. A ratio of Fe.sup.2+/Fe.sup.3+ is between 0.02 and 0.1. The glass composition has a log 3 viscosity of between about 911 ° C. and about 1173 ° C.

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.