SSB05
Cone 05 · Bends 1021°C (1870°F) at 15°C/hr (slow) · Bends 1031°C (1888°F) at 60°C/hr (medium) · Bends 1044°C (1911°F) at 150°C/hr (fast) · 63.5 mm (2½ in) tall, ceramic · Built-in base — no cone plaque, clay pat, or wire holder needed · Mounting height and 8° angle preset at the factory · Endpoint is a 90° bend, tip level with the base · Red iron-bearing — Orton publishes the Iron Free SSK series for reduction · Contains crystalline silica — do not grind or breathe the dust
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Bends at 1031°C (1888°F) at 60°C/hr, with slow and fast rates published as well. The base is moulded in, so it needs no plaque or holder. For craft and art bodies, wall tile and glazes.
Cone 05 in Orton's self-supporting (SSB) series. It bends at 1021°C (1870°F) at 15°C/hr, 1031°C (1888°F) at 60°C/hr, and 1044°C (1911°F) at 150°C/hr, each measured over the firing's last 100°C. The patented base is moulded in, so it stands on the kiln shelf straight from the box, with no plaque or wire holder and no mounting angle to set. Those figures are not a tolerance: a cone measures heat-work, time and temperature combined, so the firing rate decides which number applies. Cones 010 through 3 are red iron-bearing and can fire matte, green, or bloated without oxygen; Orton publishes the Iron Free SSK series across that range for reduction.
