This in-depth tutorial explores the use of float glass in kiln-forming, combining technical understanding with a practical, sculptural project.
Drawing on over sixteen years of experience across lampworking, fusing, casting and kiln-forming, this guide is rooted in a scientific approach to glass—focusing on behaviour, compatibility and process control.
The project centres on a spiral (ammonite-inspired) form, providing a clear structure through which to understand the challenges and possibilities of working with float glass.
Float is often overlooked in favour of tested systems such as Bullseye or Spectrum. However, its iron oxide content produces a unique depth of colour—particularly in thicker work—shifting from pale tones to rich, luminous greens. This tutorial embraces those qualities while addressing the technical considerations required to use float successfully.
What You’ll Learn
The key differences between float glass and COE-tested systems
How COE variation affects compatibility and outcomes
Designing and constructing a spiral form for kiln-forming
Managing thickness, mass and heat distribution
Avoiding common issues such as stress, cracking and devitrification
Practical considerations when working outside a standardised glass system
What’s Included
Step-by-step written tutorial
Spiral template for construction
Technical guidance on working with float glass
Firing Schedule
Process insights and troubleshooting notes