The Timeless Beauty of Convex Glass: A Complete Guide

Convex glass, also known as bubble glass or domed glass, has been a cherished element of picture framing for centuries. Since the 1970s, we have been specializing in bending and fitting antique replica convex glass, offering both vintage and modern sizes. If you’re looking for a convex glass replacement or simply want to learn more about this unique glass type, here’s everything you need to know.

What is Convex Glass?

Convex glass is a type of curved glass that bulges outward, creating a “domed” effect. It was originally used in antique frames, often paired with convex photographs, which also had a rounded surface. Today, convex glass is popular for vintage frames and is a sought-after replacement for damaged or broken glass in antique picture frames.

History of Convex Glass in Picture Framing

Convex glass was widely used in picture framing from the late 1800s through the 1940s. During this time, oval picture frames, in particular, were incredibly popular. These frames often housed family portraits, which were frequently printed on convex photographs. This rounded effect created a unique, 3D appearance that gave the image a sense of depth and dimension.

Even though oval picture frames make up less than 5% of the frames produced today, many of these antique frames are still in circulation. They can often be found in attics or basements, housing family heirlooms and portraits. However, over time, the convex glass in these frames can break or become damaged, making replacement necessary.

Measuring Convex Glass

Measuring convex glass might seem tricky, but it's quite straightforward. When measuring oval convex glass, the length and width are taken directly across the glass (not around the bend). The depth of the glass typically ranges from 3/4" to 1", although deeper bends are possible for special needs.

Common antique sizes, such as the Oval 13 1/2" x 19 5/8", might seem unusual, but we stock many of these odd sizes and offer them at no additional custom bending fees.

Custom Bending for Convex Glass

While we offer 15 standard sizes of oval convex glass, we also provide custom bending for pieces up to 20" x 24". If you need a custom size, you can simply provide a paper tracing of the measurements, and we will create a piece that fits your exact needs. Once we receive your tracing, expect a delivery time of 3-4 weeks.

The Bending Process

The process of making convex glass is truly a craft. To create convex glass, flat glass is placed into a mold and heated to temperatures that allow the glass to slump into the mold’s shape. The longer the glass is heated, the deeper the bend will be. This technique ensures the perfect curve for each piece of glass, whether you’re looking for a standard or custom bend.

Convex Glass vs. Acrylic Domes

While most convex glass typically has a bend of 3/4" to 1", some items, such as larger portraits or objects with more depth, may benefit from deeper convex glass or acrylic domes. Acrylic domes offer greater depth, ranging from 2.5" to 7", and can fit any of our frames. These domes are perfect for displays where the depth of the object being framed exceeds that of a traditional photo or canvas.

Uses for Convex Glass

Convex glass is primarily used to frame antique portraits, where both the glass and photograph have a curved shape. However, convex glass is also commonly used for other applications, including clocks, gauges, and other instruments that require a domed covering.

Why Choose Convex Glass?

Convex glass is an ideal choice for antique frames or vintage collections due to its ability to maintain the aesthetic and historical accuracy of the original framing. Whether you’re restoring an old family portrait or replacing broken glass in a cherished antique clock, convex glass helps preserve the integrity and value of the piece.

At Victorian Frame Company, we have a long history of bending and fitting convex glass for antique frames, ensuring that these beautiful, timeless frames are preserved for future generations. We offer a wide selection of standard and custom sizes, as well as professional advice to help you find the perfect convex glass replacement for your needs.

Conclusion

Convex glass brings depth and dimension to any frame, offering a classic, vintage look that has stood the test of time. Whether you need a replacement for a broken piece of bubble glass, are restoring an antique portrait, or are looking for an acrylic dome for a unique display, we have the right solution for you.

Explore our wide selection of oval convex glass, and contact us for custom orders to find the perfect piece for your frame. Our team is always here to assist with your needs, ensuring your antique frames remain beautiful and intact for years to come.