LRB5
Cone 5 · Bends 1184°C (2163°F) at 60°C/hr (medium) · Bends 1205°C (2201°F) at 150°C/hr (fast) · 63.5 mm (2½ in) tall, ceramic · Mounts in a cone plaque, clay pat, or wire holder — 51 mm (2 in) exposed at 8° · Endpoint is a 90° bend · Contains crystalline silica — do not grind or breathe the dust
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Bends at 1184°C (2163°F) at 60°C/hr, or 1205°C (2201°F) at 150°C/hr. For porcelain, stoneware, china and floor tile. Mounts in a cone plaque, clay pat or wire holder.
Cone 5 in Orton's large regular (LRB) series, for use on the kiln shelf. It bends at 1184°C (2163°F) when the last 100°C of the firing is held at 60°C/hr, and at 1205°C (2201°F) at 150°C/hr. The rate matters because a cone measures heat-work, the combined effect of time and temperature, not temperature alone. Orton lists this part of the range for porcelain, floor tile, china, stoneware, structural clay and some refractory materials. Not free-standing: mount it in a cone plaque, clay pat or wire holder with 51 mm (2 in) exposed at 8°. A 6 mm (¼ in) error there shifts the bend by more than half a cone.
