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SODIUM OXIDE.

Avoid CAS 1313-59-3 / BUFFERING

Sodium Oxide (Na2O) is an inorganic compound characterized by extreme reactivity. Upon contact with water, including atmospheric moisture, it undergoes a violent exothermic reaction, rapidly converting into corrosive sodium hydroxide. Due to this inherent instability and hazardous nature, Sodium Oxide is not a viable or recognized ingredient for direct application in cosmetic or skincare products.

Science

Sodium Oxide does not exhibit a direct mechanism of action on the skin as it cannot exist stably in aqueous formulations. Its immediate and violent reaction with water to form sodium hydroxide prevents any sustained interaction with dermal layers as Sodium Oxide itself.


Research

Low confidence
Effective range N/A
Optimal

N/A


Transparency

Not commonly dusted

Sodium Oxide is an extremely reactive and unstable compound that cannot be safely formulated or exist within skincare products. Therefore, it is not an ingredient that would be 'dusted' or used for marketing purposes; its presence in a cosmetic formulation would indicate a fundamental misunderstanding of its chemistry and pose significant safety hazards.


The Formula

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Sodium Oxide is profoundly unstable. It reacts violently and exothermically with water to generate sodium hydroxide, a strong base. It is also highly hygroscopic, readily absorbing moisture from the air, rendering it impossible to formulate stably in typical aqueous skincare products.

Conflicts

  • water
  • acids
  • many other compounds
  • air moisture

Safety

CIR Status
Not reviewed
Sensitization risk High

Sodium Oxide is a highly hazardous substance due to its violent reaction with water, producing corrosive sodium hydroxide (NaOH). While NaOH is regulated and used in controlled, low concentrations for pH adjustment in cosmetics, Sodium Oxide itself is not recognized or safe for direct cosmetic use. Exposure would cause severe irritation and chemical burns.


Your Skin

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Avoid

Sodium Oxide is an extremely hazardous and unstable compound that violently reacts with water to form corrosive sodium hydroxide, making it entirely unsuitable and unsafe for any cosmetic application.


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