Pilkington Glass Limited

Kenneth John Pearson

John Evason

Mervyn John Davies

A sealed insulating unit includes two parallel opposed panes with a spacing and sealing system between the two panes. The panes and the spacing and sealing system together define a sealed gas space. The spacing and sealing system includes a spacer frame with a primary seal between each side of the spacer frame and the opposing pane face and a secondary seal extending between the panes outside the outer peripheral face of the spacer frame. Each primary seal is greater than 0.4 mm thick on construction of the unit and has at least 7 grams of sealant material on each side of the spacer frame per meter of the spacer frame length. A spacer for a sealed insulating unit has side walls in which are defined elongate recesses, the dimensions of the recesses being selected such that sufficient primary sealant can be accommodated to provide in the sealed insulating unit opposed primary seals each at least 0.4 mm thick.

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St. Helens, United Kingdom

Kenneth John Pearson