Bullseye Hot Damz 20-Inch: Planning a Larger Fused-Glass Slab

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When planning a thicker fused-glass slab, containing the glass is a separate task from choosing its colours. A refractory dam is part of that containment setup, not a complete mold or a substitute for a suitable firing plan.

What the listing confirms

Our listing identifies a 20-inch-long dam with a height of 1.5 inches and thickness of 0.625 inch. It describes mullite/cordierite dams used with hard-brick bracing and crisp edges intended to contact a kiln shelf. The listing refers to work up to approximately 19 by 19 inches when using the 20-inch version. That description is not a verified layout or guarantee of usable size in your kiln.

Who should consider it?

Our editorial assessment: more relevant to an instructed kiln-glass maker planning a contained slab than to someone making a first simple fused piece. The required skills include understanding the actual glass system, preparing approved contact surfaces, arranging kiln furniture and following suitable firing and annealing guidance.

Before buying, confirm how many dams and braces the design requires and exactly what is supplied per order. The product photograph does not establish a complete set of four sides or included bracing.

Advantages and trade-offs

The longer format may suit a larger containment plan. Its stated dimensions allow comparison against your approved furniture layout. Trade-offs include the space needed for dams and bracing, additional preparation and the need for a process suitable for thicker glass. No measured leak resistance, lifespan or guaranteed slab quality is claimed.

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Checks before firing

Obtain the actual dam and kiln instructions for placement, support, separator preparation, clearances and operating limits. Do not assume that a dam's height is a recommended glass thickness. Do not copy a schedule for a thinner project or treat a 19-inch nominal work size as proof that the entire setup fits a 19-inch chamber.

Use material-specific safety guidance for handling and any surface preparation. Follow the kiln's cooling and handling instructions. A buying guide cannot establish a safe firing program for an unknown glass mass and equipment combination.

The takeaway: choose the longer dam against a complete, verified containment and kiln-loading plan, not the desired finished dimensions alone.

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Source and editorial approach

Product facts: current store listing. This is a listing-based buying assessment, not independent testing. No exact-product community consensus or universal firing schedule is claimed. Manufacturer instructions and project-specific guidance remain necessary.