Original vintage catalog for SEALED INSULATING GLASS MANUFACTURERS ASSOCIATION. Sigma members market factory fabricated hermetically sealed Insulating Glass Units composed of two or more lights of glass separated by an air space containing dry air. Double glazed units wind load capacity, heating and air conditioning glass properties, percent of window area receiving noon solar radiation, condensation predictions charts shown. Main office was located at 111 East Wacker Drive, Chicago, IL. This unique old 1982 four page architectural specifications catalog would make a marvelous addition to your engineering collection. Pages are loose and contain a small amount of residual glue on edge.
- SKU zf997
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