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  2. Aluminium oxynitride - Wikipedia

    en.wikipedia.org/wiki/Aluminium_oxynitride

    Aluminium oxynitride (marketed under the name ALON by Surmet Corporation [3]) is a transparent ceramic composed of aluminium, oxygen and nitrogen. Aluminium oxynitride is optically transparent (≥ 80%) in the near-ultraviolet, visible, and mid-wave- infrared regions of the electromagnetic spectrum. It is four times as hard as fused silica ...

  3. Chaff (countermeasure) - Wikipedia

    en.wikipedia.org/wiki/Chaff_(countermeasure)

    The RR-144 is designed to prevent interference with civil ATC radar systems. Chaff, originally called Window[1] or Düppel, is a radar countermeasure involving the dispersal of thin strips of aluminium, metallized glass fiber, or plastic. [2] Dispersed chaff produces a large radar cross section intended to blind or disrupt radar systems.

  4. Aluminium - Wikipedia

    en.wikipedia.org/wiki/Aluminium

    Chemically, aluminium is a post-transition metal in the boron group; as is common for the group, aluminium forms compounds primarily in the +3 oxidation state. The aluminium cation Al 3+ is small and highly charged; as such, it has more polarizing power, and bonds formed by aluminium have a more covalent character.

  5. Crittall Windows - Wikipedia

    en.wikipedia.org/wiki/Crittall_Windows

    Crittall Windows Ltd is an English manufacturer of steel-framed windows, today based in Witham, Essex, close to its historic roots in the county. Its products have been used in thousands of buildings across the United Kingdom, including the Houses of Parliament and Tower of London , and are features particularly associated with the Art Deco and ...

  6. Window insulation - Wikipedia

    en.wikipedia.org/wiki/Window_insulation

    The type of window frame and the insulation of its cavity are critical for energy-efficiency and thermal performance (and for strength, durability and maintenance). Aluminum frames are excellent for strength, durability and maintenance but they are a poor choice for thermal insulation. Aluminum is an extremely conductive material.

  7. Window - Wikipedia

    en.wikipedia.org/wiki/Window

    A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air.Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame [1] in the opening; the sash and frame are also referred to as a window. [2]

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