glass seal

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• glass seal — a conducting seal in the middle of some spark plug insulators connecting the top and bottom parts of the central electrode …   Dictionary of automotive terms

• Glass-ceramic-to-metal seals — Glass to metal seals have been around for many years, with one of the most common uses being lamp bulb seals. A more recent invention is glass ceramic to metal seals.Properties Glass ceramics are polycrystalline ceramic materials prepared by the… …   Wikipedia

• seal — [1] A flexible ring, disc or washer that prevents the passage of liquid, air, gas or dirt. [2] To prevent the passage of liquid, air, gas, etc. by means of a seal or sealant (e.g., on seams, joints, flanges). [3] to coat a surface (e.g., when… …   Dictionary of automotive terms

• Glass-to-metal seal — Glass to metal seals are a very important element of the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass encapsulated semiconductor diodes, reed switches, pressure tight glass windows in metal cases, and… …   Wikipedia

• Glass tube — Glass tubes or glass tubing are hollow pieces of borosilicate glass used in laboratory glassware. They are commercially available in various thicknesses and lengths, according to known standards. Glass tubes can be cut by scoring with a diamond… …   Wikipedia

• Seal of the United States Senate — The Seal of the United States Senate is used to authenticate certain official documents of the United States Senate, and its design also sometimes serves as a sign and symbol of the Senate, appearing on its official flag among other places. The… …   Wikipedia

• Glass microsphere — For microspheres made of other materials, see Microsphere. SEM micrograph of a glass microsphere in concrete Glass microspheres are microscopic spheres of glass manufactured for a wide variety of uses in research, medicine, consumer goods and… …   Wikipedia

• Glass ionomer cement — A Glass Ionomer Cement (GIC) is one of a class of materials commonly used in dentistry as filling materials and luting cements. These materials are based on the reaction of silicate glass powder and polyalkeonic acid. These tooth coloured… …   Wikipedia

• Seal (emblem) — Present day impression of a Late Bronze Age seal …   Wikipedia

• Glass — This article is about the material. For other uses, see Glass (disambiguation). Moldavite, a natural glass formed by meteorite impact, from Besednice, Bohemia …   Wikipedia

• Seal (mechanical) — Compression seal example A mechanical seal is a device which helps join systems or mechanisms together by preventing leakage (e.g., in a plumbing system), containing pressure, or excluding contamination. The effectiveness of a seal is dependent… …   Wikipedia