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Frequently Asked Questions
Fusible glass is formulated to melt and bond at predictable temperatures without cracking or warping. It’s used in glass fusing art to create everything from jewelry to decorative panels. Most fusible glass is labeled with its COE (coefficient of expansion), such as 90 or 96, to ensure compatibility during firing.
Yes, many ceramic kilns can be used for art glass fusing, as long as they have programmable temperature controls. A kiln with precise ramping and hold capabilities is essential for even heating and proper annealing.
Fusing joins layers of fusible glass together into a single piece at high temperatures (typically 1350°F–1500°F). Slumping uses lower temperatures (around 1200°F–1300°F) to soften glass into molds, creating bowls, plates, and other curved forms.
Small bubbles are often caused by trapped air between glass layers. To reduce them, ensure your pieces are clean, stacked evenly, and appropriately sized—cutting the base slightly larger than the top layer can help air escape before the edges seal.
Large bubbles usually form when thick or uneven glass layers trap significant air. Use slow initial ramp-up cycles, avoid overlapping edges too tightly, and ensure proper ventilation between pieces to prevent bubble pockets.
Kilnforming refers to shaping glass through controlled heating in a kiln. This includes fusing, slumping, casting, and firepolishing—each technique offering different effects and textures in fused glass art.
Always apply a fresh, even coat of kiln wash or use fiber paper as a separator. Firing on a clean, protected surface helps preserve your glass and shelves.
Yes—recoating your kiln shelf with primer before each firing is highly recommended. This prevents sticking, promotes a smoother finish on your glass, and helps avoid devitrification.
Devitrification is a dull, sometimes rough surface that can occur when glass is held too long in the 1000°F–1300°F range. Avoid overfiring, clean your glass, and fire on a well-prepped surface to minimize it.
Start with a quality glass cutter, running pliers, and proper safety gear. Many artists take beginner classes or follow step-by-step video tutorials to build confidence before investing in fusible glass sheets and tools.