page_title: Fluoride glass
hierarchical_section_title: Fluoride glass
caption_attribution_description: English: Fibre optic strands
context_page_description: Fluoride glass is a class of non-oxide optical glasses composed of fluorides of various metals. Due to their low viscosity, it is very difficult to completely avoid the occurrence of any crystallization while processing it through the glass transition.
  Thus, although heavy metal fluoride glasses exhibit very low optical attenuation, they are not only difficult to manufacture, but are quite fragile, and have poor resistance to moisture and other environmental attacks.
  Fluoride glasses' best attribute is that they lack the absorption band associated with the hydroxyl group which is present in nearly all oxide-based glasses.
context_section_description: Fluoride glass is a class of non-oxide optical glasses composed of fluorides of various metals. Due to their low viscosity, it is very difficult to completely avoid the occurrence of any crystallization while processing it through the glass transition (or drawing the fiber from the melt).
  Thus, although heavy metal fluoride glasses (HMFG) exhibit very low optical attenuation, they are not only difficult to manufacture, but are quite fragile, and have poor resistance to moisture and other environmental attacks.
  Fluoride glasses' best attribute is that they lack the absorption band associated with the hydroxyl (OH) group (3200–3600 cm⁻¹) which is present in nearly all oxide-based glasses.
caption: A bundle of optical fibers
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