Solid Sodium Cyanide Quality Specifications Sodium cyanide (NaCN) minimum purity 98% +/- 1% Sodium hydroxide (NaOH) maximum weight % = 0.4% Average briquette weight = 18–20 grams average Briquette size = 40 x 30 x 20mm Molecular Formula: : NaCN CAS Number: 143-33-9 Physical Properties Appearance: white solid/briquettes Odor: odorless Boiling point: 1497 °C Melting/freezing point: :562 °C Specific gravity: 1.6-1.62 @20°C Flashpoint: 1500 °C pH: 9.3 - 9.5