Slump firing schedule (1/4″ or 2 layers bottle glass) Ramp Temp (F) Hold Temp (F) Hold Time | Ramp Temp (C) Hold Temp (C) Hold Time 200/hr 500 15 min | 93/hr 260 15 250/hr 1100 10 min | 121/hr 593 10 250/hr 1385 3 min | 121/hr 752 3 9999 1060 45 min …