Round Convex Glass

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

4"            9"              14"

5"            10"            15"

6"            11"            16"

7"            12"            18"

8"            13"            Additional Sizes available up to 24" diameter

Click here to order Round Convex Glass.

Measuring Round Convex Glass

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

Although we stock 15 standard sizes of round convex glass, we also custom bend any size of round convex bubble glass up to 24" diameter. Please allow 3-4 weeks delivery after we receive the tracing to produce your custom size convex glass.


Although oval and round picture frames make up less than 5% of all picture frames produced 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 oval picture frames, round picture frames, or antique octagon 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.

InLine Ovals 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 Round Convex Glass

Most round 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 a round 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.

  • Round Convex Glass

    Round Convex Glass #900C

    On this page you can order Round Convex Glass, Circle Convex Glass (or Bubble Glass), which will fit into any profile of our Round Picture Frames or Circle Picture Frames. It is most often ordered with a frame from our Vintage Collection which you can...