SZ series chalk making machines, used to make calcium sulfate into chalks, the moulds have very long life more than 8 years. Very easy to operate, high capacity, will bring you considerable economic benefit. Model Capacity Weight Volume HNFB800-1 6,000-8,000 pcs/h 70 kg 0.8 m3 HNFB800-2 8,000-12,000 pcs/h 300 kg 1.65 m3 HNFB800-4 12,000-24,000 pcs/h 400 kg 2.5 m3 HNFB800-6 24,000-32,000 pcs/h 650 kg 3 m3 HNFB800-8 35,000-48,000 pcs/h 820 kg 3.5 m3