Black Friday Black Friday Coupons Black Friday Deals
Shop Deals Shop By Category
Help 0Cart
  • Your Shopping Cart is empty.
    Fill it with the best Art Glass supplies or gifts on the planet.

    If you already have an account, sign in. View Cart (0 items)
Buy 12 or more medium sized glass and get a discounted price on each.
Hello. Sign in Your Account
Glass Finder
Free Catalog
Artist GalleryArtist Gallery
Email Newsletters
Delphi Personalized Offers
Hot Glass Newsletter
Lansing Store Newsletter
Stained Glass Newsletter
[ more info ]
home : community : tips & techniques : fusing : what is fusing?

What is Fusing?

All Glass is Fusible!
Any glass will melt in a kiln when you heat it up; fusing glass successfully depends on knowing how different glasses work together. In our never-ending quest to "Make it Easy," our Delphi Experts have compiled the following pointers to help you make your next masterpiece ... in fused glass!

Coefficient of Expansion
A Coefficient of Expansion (COE) is simply a measurement of the rate that glass will expand and contract when it is heated and cooled. To fuse multiple pieces of glass together, it's important to use glass that is compatible. Fusible glass manufacturers test their glass to guarantee the COE (sometimes referred to as "tested-compatible"). To avoid stress-cracks and breakage, it is very important to use glass that has the same COE.

The two main COEs for fusible glass are 90 and 96. The main difference between the two is that 96 is generally softer and fuses at lower temperatures than 90. Regardless of the COE you decide to work with, you will have an amazing selection of colors to use in your palette.

Test Firings
An invaluable shortcut to getting the result you want is to make test firings. Simply cut small pieces of the glass you plan to use in a project and fuse a test tile. This will help you predict any color shifts and ensure compatibility. For instance, some glass colors "strike" (change color) when they are heated: Bullseye's Light Pink is pale lavender and strikes to a beautiful bright pink.  Many fusers keep track of test firing for easy reference. For your convenience you can print a firing log sheet from Delphi's Tips and Techniques web page.

96 is Great for Beginners
96 COE glass is excellent for beginners because it has a longer working range that provides more gradual heating changes. 96 COE glass gets softer as it gets hotter, then it becomes more rigid as it cools, with a smooth progression and predictability. Of course, these easy to work with properties also make it a favorite with many advanced artisans.

90 Offers an Incredible Selection
Looking for a huge color palette? 90 COE glass has been used by glass artists for many years, resulting in an amazing selection of color that has been developed for fusers. Delphi offers hundreds of types of 90 CEO glass. In addition to the colors there's plenty of dazzling effects, including textures, streamers, feathers and streaks. Not to mention iridized and dichroic coatings, frit, confetti and stringers!

Organizing Tip
If you are going to use glass with different COEs, plan ahead by creating separate storage areas for each one. The Glass Caddy (#7151) is a great tool to keep it apart: just label one caddy "COE 90", and the other "COE 96."

188 Posts
Top Contributor Gallery Artist
Jennifer Bonesteel
Thursday, March 20, 2014
@speakspoke we don't have any experience with using either of these products in a blown glass application. We believe that decals are likely to burn away in the heat of the torch. Flexiglass matures much like regular glass and reacts something like frit or enamel would when used with binders like liquid stringer or other glass medium. Again, we aren't sure about the use of either of these products with a torch but we'd love to hear about your results.
Reply | Report Abuse
1 Post
Wednesday, March 12, 2014
Hello, I am a glassblower and was interested in the applications for flexiglass and decals on blown pieces. Also, what temperature does flexi glass mature?
Reply | Report Abuse
188 Posts
Top Contributor Gallery Artist
Jennifer Bonesteel
Thursday, February 27, 2014
@bburton the line between the two pieces of glass will easier to see after grinding, especially if there are distinct color differences in the layers of glass. A fire polish in the kiln can help to minimize the distinction but it can't always be entirely eliminated. For an appropriate fire polish schedule see
Reply | Report Abuse
1 Post
Wednesday, February 26, 2014
In regard to fusing jewellery, what is the tip to minimize the fuse line? Do they appear because of grinding? If grinding is needed what is the tip to eliminate, or is there one?
Reply | Report Abuse
1 Post
Friday, August 23, 2013
I´d like to know if the 90 coe dots are compatibles to float glass coe 88? thank you I´m from Buenos Aires Argentina
Reply | Report Abuse
1 Post
Sunday, December 5, 2010
Your introduction to fising was very informative I just wish it had went farther. I had a new kiln delivered about 6 months ago and it has set in my shop and never been turned on.
Reply | Report Abuse
Add a comment
You must log-in before you can post a comment
Forgot Password