Skip to content

pH Adjuster

CALCIUM OXIDE

CAS 1305-78-8 Updated
30

Safety score · 0–100

Caution

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

Calcium oxide (quicklime) — a strongly caustic alkali. Used industrially and in some hair relaxers, but burns skin and eyes on contact and reacts violently with water. Not a leave-on cosmetic.

Function

BUFFERING

Skin benefits

  • pH adjustment in industrial processes
  • Hair relaxer chemistry

Known concerns

  • Caustic — chemical burns
  • Exothermic with water
  • Inhalation hazard
  • Not for leave-on cosmetics

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

Related ph adjusters

30
AMMONIUM NITRATE
pH Adjuster
 30
ETHANOLAMINE
pH Adjuster
 30
GUANIDINE CARBONATE
pH Adjuster
 30
POTASSIUM SILICATE
pH Adjuster
 28
HYDROBROMIC ACID
pH Adjuster
 28
SODIUM METASILICATE
pH Adjuster
 34
1,6-HEXANEDIAMINE
pH Adjuster
 35
2-AMINOBUTANOL
pH Adjuster

Check your shelf

Find CALCIUM OXIDE in your products.

Scan any cosmetic product with LuxSense to see if it contains CALCIUM OXIDE and get a full ingredient breakdown with safety scores.

This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.