A fire resistant corrugated coaxial cable is described that employs a high-temperature, insulating alkaline earth silicate (AES) wool dielectric. The AES wool dielectric is devoid of water as a constituent. The AES wool may be survivable under conditions of high heat, such as temperatures specified by common fire test standards (e.g., 1850° F./1010° C. for two hours). The cable is configured to maintain a relatively coaxial relation between a center conductor and an outer conductor even under aforementioned fire tests. A layer of ceramifiable silicone rubber or refractory fiber wrap can surround the outer conductor and continues to insulate it from the outside if a low-smoke zero-halogen (LSZH) jacket burns away.

A feedthrough assembly includes: a ferrule; an insulating structure; and a seal fixedly securing the insulating structure within the ferrule, the seal comprising a glass and single-phase particulate dispersed therein; wherein the glass includes: 25% to 40% B.sub.2O.sub.3; 0 to 25% CaO; 0 to 25% MgO; 0 to 25% SrO; 0 to 10% La.sub.2O.sub.3; 5% to 15% SiO.sub.2; and 10% to 20% Al.sub.2O.sub.3; wherein all percentages are mole percentages of the glass.

A feedthrough assembly includes: a ferrule; an insulating structure; and a seal fixedly securing the insulating structure within the ferrule, the seal comprising a glass and single-phase particulate dispersed therein; wherein the glass includes: 25% to 40% B.sub.2O.sub.3; 0 to 25% CaO; 0 to 25% MgO; 0 to 25% SrO; 0 to 10% La.sub.2O.sub.3; 5% to 15% SiO.sub.2; and 10% to 20% Al.sub.2O.sub.3; wherein all percentages are mole percentages of the glass.

A glass ceramic sintered body having a small dielectric loss in a high frequency band of 10 GHz or higher and stable characteristics against temperature variation and a wiring substrate using the same are provided. The glass ceramic sintered body contains crystallized glass, an alumina filler, silica, and strontium titanate. The content of the crystallized glass is 50 mass % to 80 mass %, the content of the alumina filler is 15.6 mass % to 31.2 mass % in terms of Al.sub.2O.sub.3, the content of silica is 0.4 mass % to 4.8 mass % in terms of SiO.sub.2, and the content of the strontium titanate is 4 mass % to 14 mass % in terms of SrTiO.sub.3.

A feedthrough assembly includes: a ferrule; an insulating structure; and a seal fixedly securing the insulating structure within the ferrule, the seal comprising a glass and single-phase particulate dispersed therein; wherein the glass includes: 25% to 40% B.sub.2O.sub.3; 0 to 25% CaO; 0 to 25% MgO; 0 to 25% SrO; 0 to 10% La.sub.2O.sub.3; 5% to 15% SiO.sub.2; and 10% to 20% Al.sub.2O.sub.3; wherein all percentages are mole percentages of the glass.

A feedthrough assembly includes: a ferrule; an insulating structure; and a seal fixedly securing the insulating structure within the ferrule, the seal comprising a glass and single-phase particulate dispersed therein; wherein the glass includes: 25% to 40% B.sub.2O.sub.3; 0 to 25% CaO; 0 to 25% MgO; 0 to 25% SrO; 0 to 10% La.sub.2O.sub.3; 5% to 15% SiO.sub.2; and 10% to 20% Al.sub.2O.sub.3; wherein all percentages are mole percentages of the glass.

A glass-ceramic-ferrite composition contains glass, a ceramic filler, and NiZnCu ferrite. The glass contains about 0.5% by weight or more of R.sub.2O, where R is at least one selected from the group consisting of Li, Na, and K; about 5.0% by weight or less of Al.sub.2O.sub.3; about 10.0% by weight or more of B.sub.2O.sub.3; and about 85.0% by weight or less of SiO.sub.2 on the basis of the weight of the glass. The NiZnCu ferrite accounts for about 58% to 64% by weight of the glass-ceramic-ferrite composition. The ceramic filler contains quartz and, in some cases, forsterite. The quartz accounts for about 4% to 13% by weight of the glass-ceramic-ferrite composition. The forsterite accounts for about 6% by weight or less of the glass-ceramic-ferrite composition.

A glass powder of the present invention is a glass powder, which is formed of alkali borosilicate glass, wherein the glass powder includes 0.1 mol % to 1.0 mol %, provided that 1.0 mol % is excluded, of Li.sub.2O+Na.sub.2O+K.sub.2O in a glass composition, has a molar ratio Li.sub.2O/(Li.sub.2O+Na.sub.2O+K.sub.2O) of from 0.35 to 0.65, a molar ratio Na.sub.2O/(Li.sub.2O+Na.sub.2O+K.sub.2O) of from 0.25 to 0.55, and a molar ratio K.sub.2O/(Li.sub.2O+Na.sub.2O+K.sub.2O) of from 0.025 to 0.20, and has a specific dielectric constant at 25? C. and 16 GHz of from 3.5 to 4.0 and a dielectric dissipation factor at 25? C. and 16 GHz of 0.0020 or less.

A fire resistant corrugated coaxial cable is described that employs a high-temperature, insulating alkaline earth silicate (AES) wool dielectric. The AES wool dielectric is devoid of water as a constituent. The AES wool may be survivable under conditions of high heat, such as temperatures specified by common fire test standards (e.g., 1850? F./1010? C. for two hours). The cable is configured to maintain a relatively coaxial relation between a center conductor and an outer conductor even under aforementioned fire tests. A layer of ceramifiable silicone rubber or refractory fiber wrap can surround the outer conductor and continues to insulate it from the outside if a low-smoke zero-halogen (LSZH) jacket burns away.

A join is provided that has an electrically insulating component and two joining partners secured to one another and electrically insulated from one another by the electrically insulating component. The electrically insulating component has a surface that extends between the two joining partners. The surface defines a structure selected from a group consisting of an elevation, a depression, and any combinations thereof. The structure elongates a direct path along the surface. The structure completely surrounds at least one of the two joining partners. The electrically insulating component and/or the structure includes a glass that is at least partially crystallized.