IUPAC Name:Disodium hydroxide
Synonyms: Sodium oxide (Na₂O) ; Sodium monoxide: (Sodium oxide)
CAS NO : 12401-86-4
EINECS: 235-641-7
Molecular Formula: Na₂O 
Molecular Weight: 62.9863 
Molecular Struture:
Product Categories: Inorganics
Mol File: 12401-86-4.mol
Appearance: Sodium monoxide (CAS NO : 12401-86-4) is a white granular material.

  Sodium monoxide (CAS NO : 12401-86-4) is used in ceramics as a glaze additive. It is also a constituent of glass at around 15% sodium oxide.

 It is formed when sodium is burned with limited oxygen to the following equation:
4Na + O₂ → 2Na₂O
 

Very corrosive and irritating to skin, eyes, and mucous membranes. Can react violently with water, nitric oxide (above 100°C). Ignites when mixed with 2,4-dinitrotoluene. Mixtures with phosphorus(V) oxide react violently when warmed or on contact with moisture. When heated to decomposition it emits toxic fumes of Na₂O. See also SODIUM HYDROXIDE.

DOT Classification:  8; Label: Corrosive

1.General Description: A white granular material. sodium oxide reacts with water to give sodium hydroxide with the evolution of heat. sodium oxide is corrosive to metals and tissue. sodium oxide is used in chemical manufacture.
2.Air & Water Reactions: The oxides of sodium and potassium react with water vigorously and with enough evolution of heat to cause boiling and spattering of hot caustic solution
4.Reactivity Profile :Sodium monoxide (CAS NO : 12401-86-4) reacts as a base. sodium oxide and nitric oxide react vigorously above 100°C .
5.Health Hazard: Toxic; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Reaction with water or moist air will release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
6.Fire Hazard: Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.