Choose Bullseye Glass

Choose Bullseye Glass

Which glass is best for fusing?

Why 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.

Choose compatible glass. Choose a huge range. Choose consistency. Choose great discounts: Choose Bullseye Glass.

Benefits of Bullseye Glass:

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
  • Spectrum CoE96
  • Float CoE82
  • Borosilicate (Pyrex) CoE40

Why is compatibility and 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.

Best fusing glass from Warm Glass

What can Warm Glass offer you?
  • Low prices: 3mm Tekta clear base glass is cheaper per than the Spectrum Icicle alternative. Many of our most popular styles are cheaper per than System 96.
  • Loyalty discounts: We provide ongoing discounts of up to 20% for our most loyal customers. See our Discounts page for details.
  • Large stock: We have 3 modern warehouses and receive regular deliveries directly from Bullseye in the USA.
  • Best range: We offer the largest range of Bullseye glass styles in the UK, all with guaranteed CoE 90 compatibility.
  • Not just glass: Bullseye can be used with many other products such as Glassline pens, micas, foils and decals to expand your creativity further.
  • Special orders: We can special order anything from Bullseye if we don't already have it.
  • Efficient order processing: We have installed a new warehousing system which can efficiently handle high order volumes. Always well packed and processed quickly.
  • Free advice on tap: We provide a telephone helpline and our online Knowledge Base with firing schedules, tips and video tutorials. All free.
  • Low cost, fast delivery: Free delivery available on UK orders over £40 and only £9.95 for up to 30kgs to most mainland Europe destinations. Next day delivery options available.
  • Less plastic - We have been working hard to reduce the amount of single use plastics we use. See our Caring for the Environment page for more details.

Here are answers to some of the questions those interested in switching to Bullseye Glass ask most frequently:

  • Q: Is Bullseye Glass the same as Spectrum or Uroboros?

    A:  In most respects Bullseye Glass is very similar to these other makes of glass. You can work with Bullseye in the same way as Spectrum and Uroboros System 96 glass, but because it is CoE90 rather than CoE96, they can't be used together.  The firing schedules you use for Bullseye are slightly different for this reason. See our firing schedule page for details.


  • Q: Can I use my System 96 frits and powders with Bullseye Glass?

    A:  No, Bullseye Glass is CoE90, not CoE96 so has a different expansion rate to System 96. However, all Bullseye Glass styles and the accessories we stock can be used with each other without any problem.


  • Q: Do Bullseye offer a low cost clear base glass?

    A:  Yes, Bullseye Tekta is a quality, low cost base glass available in 3mm, 4mm and 6mm thicknesses, as well as in 3mm white. We offer Tekta in many different sizes, as well as our popular Mega Tekta Saver Packs.


  • Q: Can I use my decals with Bullseye Glass?

    A:  Yes, absolutely. You can use your decals, Glassline pens, enamels, mica etc with Bullseye Glass.


  • Q: Do I have to make any changes to my kiln?

    A:  The only change you would need to make is to use slightly different firing schedules.  Take a look at our Kiln Schedules page for our basic Bullseye firing schedules. Programming glass kilns is simple, and videos on how to do this can be viewed on our Video Tutorials page. We also have firing schedules for each mould and decal we sell, just look at the product page for all the information you need. If you need any further help then please do not hesitate to contact us.


  • Q: Is Bullseye Glass suitable for casting as well as fusing?

    A:  Yes, all our glass is CoE90, Bullseye Glass compatible and suitable for applications such as glass fusing, glass casting and glass slumping (unless otherwise stated in the description). We also stock Bullseye rods suitable for torch-working.


  • Q: Does Bullseye Glass have a good range of colours to choose from?

    A:  Bullseye has a huge range of over 250 glass styles, including their low cost base glass called Tekta, and many beautiful decorative styles. The base colours are available in 2mm and 3mm sheet glass, and most are also available as powders, frits, billet, stringers, rods and confetti. We also stock Bullseye compatible CBS Dichroic glass, millefiori and murrine.


  • Q: Isn't Bullseye Glass more difficult to cut?

    A:  We have never found Bullseye Glass difficult to cut. We sell Toyo Glass Cutters which, as well as being one of the lower priced glass cutters on the market, is excellent for cutting Bullseye Glass. For more help on glass cutting take a look at the Bullseye Tipsheet 'Improve Your Cutting'.


  • Q: I have heard Bullseye Glass is more expensive then Spectrum, is this true?

    A:  Following a recent cost analysis of UK prices we can assure you that in almost all cases Bullseye Glass is cheaper per square cm than the Spectrum equivalent, particularly on the more popular styles. On top of this we offer frequent sales and ongoing Loyalty Discounts for our customers.


  • Q: What is a Striker Glass?

    A:  You will see on some of the glass descriptions that the glass style is a 'Striker'. This means that while the unfired sheet may appear pale or mottled, it will reach its target colour upon firing. The product image will show what the glass sheet will look like before and after firing.


  • Q: How do I know if the products on your site are Bullseye compatible?

    A:  We want our customers to be able to buy with confidence, so all our glass is CoE90, Bullseye Glass compatible and suitable for applications such as glass fusing, glass casting and glass slumping. In the rare instances where we may stock a non-compatible item (for example some flameworking rods) this is always very clearly stated in the product description.


  • Q: Where can I get help using Bullseye Glass?

    A:  We have lots of useful information on our website, both in the details of the individual products and in our comprehensive Knowledge Base. If you can't find the information you need then we are here to help you. Just contact us.


Best fusing glass

Want to know more? Just call us on 01934 863344, or contact us. We are here to help. Come and join us!