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Tips & Techniques

In today's world Delphi stands out by offering friendly, personalized, and expert service. Our staff knows stained glass, fusing, mosaics and jewelry crafts because we love creating using these techniques. In fact, some of us are even teachers. Here is a sampling of the many questions and comments we have received from you and would like to share with you. Don't be surprised if you discover a letter of your own.

New Help Comments

Glass Fusing Comment

by Karina Foster on Nov 24, 2017

165 Posts
Top Contributor Gallery Artist

@tiptondf While some artists are able to successfully fire glass in a ceramic kiln, it is a much more challenging process than fusing in a glass kiln. Glass kilns typically have elements in the lids that allow the glass to heat more evenly, whereas ceramic kilns often only have elements around the outside perimeter. Because of this difference, and the difference in firing chamber size it is important to be cautious not to heat or cool the kiln too quickly as the risk of thermal shock is greater in this configuration. Additionally, ceramic kilns are usually designed with a lot of depth for tall artworks and to allow multiple shelves to be stacked. While this is fine for ceramics, positioning multiple shelves for glass firing can create uneven heating and heat distribution. The result of this may be some projects over-firing while others are under-fired, as well as increased risk of thermal shock. To best determine how to use the built-in controller you may wish to reach out to the manufacturer or a ceramic supply business that is more familiar with the operation of the controller as it relates to heating rates in that particular model of kiln. Additionally, there are multiple types of pyrometric cones, and using them to gauge temperature isn't an absolute measure, as style of cones, heating rate and firing time can impact their performance. It appears most process temperatures for glass fusing can be achieved between a cone 019 and 013. You can find more information about cones by conducting a web search for pyrometric cone temperature charts. For more information about preferred glass firing schedules you can visit

Glass Fusing Comment

by tiptondf on Nov 23, 2017

2 Posts

I just inherited an older Duncan kiln that uses cones I want to fuse answer slump glass in this as it is larger than my glass kiln. What cones do I use and how long does it need to fire there are 2 dials on kiln having low,med, and high

Special Events & Classes

classes and workshops

Delphi offers a huge variety of beginning, intermediate and advanced classes in a wide variety of art glass and jewelry crafts. Classes are offered in different formats, from one 2-1/2 hour session, to all day classes, to multiple week sessions. Browse the schedule below to find the class that's right for you! All classes are in Delphi's state-of-the-art classrooms in our Lansing, Michigan location. Sign up for a class or request more information by calling 800-248-2048 or 517-394-4685.

Visit Delphi Creativity Center

Delphi Center : Visit Us

See finished examples of every technique, and try not to be overwhelmed by all the project ideas. Get tips from the pros to make your projects even better, take a one-day workshop, or even learn a new technique in our demo areas. There is always something creative going on at the Delphi!