Diammonium Phosphate

Diammonium Phosphate molecular structure
molecular structure · PubChem
AKA: 7783-28-0, Diammonium hydrogen phosphate, Ammonium phosphate dibasic, Phosphoric acid, Diammonium salt, Akoustan A, Fyrex, Pelor, Dibasic ammonium phosphate, Dibasic
Synthetic
Not Clean
Diammonium hydrogenorthophosphate
Effective at 4.78%
Solubility Insoluble in ethanol, acetone
Formula
H9N2O4P
Mol. Weight
132.06
CAS #
7783-28-0
Form
Powder
State
Ammonium phosphate is a white solid with a weak odor of ammonia. Sinks and mixes with water. (USCG, 1999)
Functions
Anticorrosive
Buffering
Oral Care
Prevents Corrosion
Stabilizes pH
Antioxidant Protection
Locks In Moisture
Brightens Skin
Supports dental health
Prevents product degradation
Maintains optimal pH
Traditional Use
Inorganic buffering salt developed for industrial and cosmetic applications in the 20th century. Functions as a pH regulator and anti-caking agent in powder formulations.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
0.25%
9.3%
0%13%
Reported use
CIR reported use: 0.25-9.3
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️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