Choose Bullseye Glass

Choose compatibility, huge range, and consistency. Choose Bullseye Glass.

All glass is not equal. One of the most important decisions you have to make as a glass artist is choosing which glass to use for your work. We firmly believe that Bullseye Glass is the very best glass for fusing, which is why we choose it for our classes, our stock and our personal practice.

Benefits of Bullseye Glass:


Fuse with Confidence
All tested as compatible CoE90. Don't let compatiblility issues limit your creativity.


Low Cost Base Glass
Tekta is Bullseye's base glass, in clear & white. Cheaper per square metre than Oceanside Ice.


Huge Range
Over 250 glass styles, most available as 2mm and 3mm sheet glass, powder, stringer, rod and frit.


Constant Innovation
Bullseye regularly bring out new styles and products to keep your work fresh.


Handmade with Care
Bullseye is hand made in Portland, Oregon, US, by their expert casters.


Bullseye glass can meet the demands of your creative curiosity.


Good Company
Renowned artists such as Bob Leatherbarrow, Rudi Gritch & Amanda Simmons use Bullseye Glass.


Suitable for fusing, casting, slumping, pate de verre, drop outs and many more techniques.


Reactive Potential
Some Bullseye Glass styles have reactive qualities, allowing you to create truly unique effects.

Which glass is best for fusing?
Glass types and compatibility in more depth:

There are many different types of glass, but they must be compatible in order for them to fuse together properly in a kiln. Some glass ranges include:

  • Bullseye CoE90
  • Moretti CoE104
  • Oceanside (formerly Spectrum) CoE96
  • Float CoE82
  • Borosilicate (Pyrex) CoE40

Why is compatibility an issue?
This is important as if you try to fuse two different glass types together your piece is likely to crack, be weak, or fail to fuse together as you would like.This is largely due to the differing co-efficient of expansion (CoE) between glass types, in other words differences in the amount the glass expands and contracts in different temperatures. However even within a particular range there can be compatibiliy issues if not tested, due to the chemical differences within the glass. They might run more when molten or cause devitrification (a hazy mark on the glass). Not all glass ranges are ‘tested’ compatible so glass artists are generally advised to test every combination.

Fully compatible range:
To solve this issue, Bullseye Glass have created a comprehensive range of glass colours, styles and products that have been tested as compatible with each other. Here at Warm Glass we only stock Bullseye compatible glass and products, so you can buy anything from us safe in the knowledge that it will fire together without any of these problems. We believe Bullseye is the best range for studio work. Every batch is tested, it rarely devitrifies and is controllable in the kiln, making it excellent for slumping. Everything we sell is Bullseye compatible so you can buy with confidence.

Frequently Asked Questions

Choosing Bullseye Glass? We've Got Answers!