Monolithic glass, or single pane glass, is a single pane of glass placed in a window.

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It comes in single strength (1/16"), double strength (1/8"), triple strength (3/16") or 1/4" plate glass.

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Single pane glass is used in a variety of windows, especially in interior doors, decorative glass windows, and many vintage windows will often have single pane glass, though the insulated glass unit was invented in 1865. Modern construction properties typically use thermal IGUs.

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Single strength glass is usually in stock and, depending on size, can be cut to size and installed on the job site. Double strength glass or thicker needs to be ordered from the manufacturer.