What is a spacer bar :
A spacer bar, sometimes known as a profile, is the continuous frame which separates the two glass panes in a double glazed unit. The spacer bar is bonded to the glass panes via a primary and secondary seal,  creating an airtight cavity which is filled with air or gas. The spacer bar itself is fitted with a desiccant to absorb any residual moisture within the cavity and thus prevent condensation within the double glazed unit. Spacer bars are an important contributor to a double glazed unit. They are typically made of aluminium or more recently,  low heat - conductive material ( known as warm edge spacers
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