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Moumoujus

AMMONIUM CARBONATE.

Optional CAS 10361-29-2 / BUFFERING

Ammonium carbonate is a versatile cosmetic ingredient primarily functioning as a pH adjuster. It can also create effervescent effects and aid in gentle exfoliation.

Summary

pH adjuster buffering exfoliating agent effervescent agent

Science

Mechanism of Action

It primarily regulates pH and acts as a buffer. Upon application, it releases carbon dioxide and ammonia, contributing to a fizzing sensation and softening keratin for mild exfoliation due to its alkaline nature.

Research

Clinical Evidence

Medium confidence
Effective range 0.5–3%
Optimal

N/A

Key findings

  1. 01 CIR Safety Assessment of Carbonate Salts (2016)
  2. 02 GreyB / Slate Cosmetic Usage Insights (2025)

Transparency

Dusting Analysis

Not commonly dusted

Information regarding dusting behavior for ammonium carbonate is not available in the provided research data.

The Formula

Formulation

Solubility
Water
Optimal pH 6.5 – 9.5
0 7 14

Stability

Highly unstable and hygroscopic, it spontaneously decomposes into ammonia and carbon dioxide at room temperature. Stability is significantly compromised above 58°C.

Conflicts

  • Acids
  • High temperatures
  • Humidity/Moisture
  • Strong oxidizing agents

Safety

Safety Profile

CIR Status
Safe as used
Max tested
93.4%
Sensitization risk Low

The CIR Expert Panel found it safe when formulated to be non-irritating. While a max concentration of 93.4% is noted for rinse-off hair products, leave-on skincare typically uses concentrations below 1%.

Your Skin

Skin Compatibility

Yes Normal
No Dry
Yes Oily
No Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Optional

Ammonium carbonate is an effective pH adjuster and effervescent agent with low irritancy, but its inherent instability requires careful formulation for optimal performance.

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