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Octagon Convex Glass

Antique Octagon Convex glass is among the most common shapes of convex glass. We have been bending and fitting antique replica octagon convex glass (also known as octagon bubble glass or octagon domed glass) since the early 1970s, and we currently stock most antique octagon sizes along with their modern equivalents. Octagon Convex Glass is available in these sizes:

8 7/8 x 12 11x16                       10 5/8 x 17 11/16

9 5/8 x 15 11/16                       11 3/4 x 19 11/16                    

Additional Custom Sizes Available up to 20x24

Click here to order Octagon Convex Glass

Measuring Octagon Convex Glass

Octagon Convex bubble glass is measured just like octagon flat glass, measuring length and width directly across the glass (not around the bend of the glass). Octagon convex glass generally has a depth of between 3/4" to 1" although deeper bends are possible. Octagon sizes often seem unusual such as the 10 5/8 x 17 11/16. Many people are concerned that these odd octagon sizes are no longer available or will require custom bending fees. However, we stock many of these unusual antique octagon sizes, and most often no custom set up fees are required.

Although we stock several standard sizes of octagon convex glass, we also custom bend any size of octagon convex bubble glass up to 20" x 24". Each custom bend requires a paper tracing of the size required. Please mail us this tracing with your name, and phone number. The line you draw will be the line the glass is cut to. Please allow 3-4 weeks delivery after we receive the tracing to produce your custom size convex glass.


Although antique octagon picture frames are a very small percentage of the picture frames available today, this has not always been the case. Over half of the picture frames produced in America by some the largest picture frame factories in the late 1800's up to about 1940 were octagon picture frames, round picture frames, or antique oval picture frames. A large percentage of these frames 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 Octagon Convex Glass

Most octagon 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 octagon 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.