Safety sight glasses are required in all areas where the visual inspection of processes in vessels has to be ensured under pressure, at high temperatures or on exposure to chemicals. These sight glasses are made from soda-lime glass or borosilicate glass.

Soda-lime sight glasses

Soda-lime glass is an inexpensive glass with universal applications. This glass is produced by melting quartz sand, soda and lime together at over 1,200 °C. The outcome is a silica glass whose main constituents are silicon oxide, sodium oxide and potassium oxide. By adding various oxides during melting, it is possible to colour the glass. The glass can be decoloured by adding various metal salts, and it is then known as white glass or Optiwhite glass.

Fields of application

  • Basic material for heat-insulating and solar control glass
  • Primary material for laminated safety glass and fully tempered glass
  • Can be processed and refined for interior and exterior applications
  • Optical applications

Main properties

  • Flat, transparent, colourless or coloured
  • Various coatings possible (solar control, anti-reflective coating etc.)
  • Can be tempered and chemically toughened (Floattherm)
  • Geometries

  • Round
  • Rectangular
  • Tongue-shaped
  • Trapezoidal
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Borosilicate sight glasses

In its typical composition, borosilicate float glass (Boronorm) contains fewer colour-imparting iron oxides. This makes it a colourless glass with good thermal properties and outstanding transparency. Thanks to the low thermal expansion typical of this borosilicate, tempering yields a glass with exceptionally high thermal shock resistance.

Fields of application

  • Building services
  • Industry
  • Lighting equipment
  • Photovoltaics
  • Optical filters
  • Primary material for fully tempered glass

Main properties

  • High temperature stability (e.g. thermal shock, basic resistance up to 280 °C, Borofloat up to 450 °C)
  • Good surface quality
  • Outstanding transparency in the visible, UV and IR ranges
  • Can be tempered (Borotherm)

Geometries

  • Round
  • Rectangular
  • Tongue-shaped
  • Trapezoidal
  • Stepped glass in any form in a single piece
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