SSB04
Cone 04 · Bends 1046°C (1915°F) at 15°C/hr (slow) · Bends 1063°C (1945°F) at 60°C/hr (medium) · Bends 1077°C (1971°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
$0
Bends at 1063°C (1945°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 04 in Orton's self-supporting (SSB) series. It bends at 1046°C (1915°F) at 15°C/hr, 1063°C (1945°F) at 60°C/hr, and 1077°C (1971°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.
