All our sealed units are bespoke and are made to our customer’s individual order depending on the glass type and size required. Long gone are the days when our standard sealed unit was made with two pieces of 4mm clear float. In today’s energy conscious world and as a result of legislation change sealed units are now made with glass containing highly complex low emissivity coatings. Also advances in the technology of glass have enabled more benefits to be gained from the sealed unit. For example, self cleaning and noise reduction, whichever glass is ordered the two panes are washed in order to remove grease and fingerprints and are then set either side of a spacer bar; the spacer bar generally has the two longest lengths filled with a molecular sieve desiccant to remove moisture trapped in the cavity during manufacturing. This lowers the dew point of the air or gas in the cavity, thus preventing condensation from forming on the inside surface of the sealed unit when the outside glass pane temperature falls. The spacer bar is then sealed on both sides with a primary butyl seal and placed into a press to ensure the primary seal is intact around the whole of the unit’s sides. Most units these days are pressed in a chamber containing argon gas, as opposed to normal air, again to improve the energy efficiency of the sealed unit.