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Rectangle Convex Glass #900R

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We have been bending and fitting antique replica Rectangle convex glass (also known as bubble glass or domed glass) since the early 1970s, and we currently stock most antique rectangle sizes along with their modern equivalents. 

Measuring Rectangle Convex Glass

Rectangle Convex bubble glass is measured just like rectangle flat glass, measuring length and width directly across the glass (not around the bend of the glass). Rectangle convex glass generally has a depth of between 3/4" to 1" although deeper bends are possible. 

Although we stock 7 standard sizes of rectangle convex glass, we also custom bend any size of rectangle convex bubble glass up to 20" x 24". Please allow 3-4 weeks delivery after we receive the tracing to produce your custom size convex glass.


A large percentage of picture frames produced in the late 1800's to early 1900's were used to frame family portraits with convex glass. Today many attics and basements are home to these family heirlooms framed in antique frames and often broken convex bubble glass.

OVALCREST has been bending convex glass replacements for these images since the early 1970’s and today we continue to manufacture convex glass along with a unique collection of antique replica frames. 

Uses of Rectangle Convex Glass

Most rectangle convex glass is used to cover antique portraits in which the photographs themselves were also convex. We produce convex glass to fit our own antique replica frames, and also can supply an rectangle convex glass replacement to fit actual antique frames. We also regularly produce convex glass replacements to replace broken pieces in clocks, gauges and other instruments.

The Bending Process

Convex Glass is made by laying flat glass into frame molds and heating the glass to temperatures that allow the glass to slump. Longer heat creates a deeper bend. Most bends are between 3/4" and 1" deep.

Convex Glass

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