The double-glazed unit, which slots into a window frame, is made up of a number of components.

It includes:

  • A spacer bar – what separates the two panels of glass
  • Desiccant – a silicon material used in the spacer bar to absorb the moisture that stays within the cavity
  • Primary seal – the main part that blocks the air or moisture into the double glazed unit
  • Secondary seal – the functional glue located around the outside edge of the unit, connecting all of the parts
  • The glass – specifically chosen during the creation stage
  • The cavity – the gap formed between the component parts.