Ammonium Sulfite
molecular structure · PubChem
AKA: Ammonium sulphite, Diammonium sulfite, 10196-04-0, Diammonium sulfonate, Sulfurous acid, Diammonium salt, Ammonium salt
Synthetic
Preservative
Not Clean
Ammonium sulfite is a colorless crystalline solid. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. It is used in the manufacture of other chemicals, in medicine, and photography.
Solubility Soluble in water, almost insoluble in alcohol, acetone.
Formula
H8N2O3S
Mol. Weight
116.14
CAS #
10196-04-0
Form
Powder
State
Ammonium sulfite is a colorless crystalline solid. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. It is used in the manufa
Functions
Hair Waving Or Straightening
Preservative
Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.
Reducing
Preserves Formula
Reducing Agent
Antioxidant Protection
Fights Bacteria
Reduces Inflammation
Changes hair texture
Prevents microbial growth
Chemical reduction
Traditional Use
A synthetic salt developed for industrial purposes. Used in cosmetics as a preservative and reducing agent, particularly in hair treatment formulations, with no traditional use history.
EWG
4
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
Not an Irritant
medical-approval
all-shades-safe
Concentration Guide
0.2%
0%0%
Reg. Limit
EU regulatory limit: 0.2%. SO2) Source: EU Cosmetics Regulation (EC) 1223/2009, Annex V (Preservatives), Entry 9.
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR