Disodium Pyrophosphate

AKA: 7758-16-9, Sodium acid pyrophosphate, Disodium dihydrogen pyrophosphate, Disodium dihydrogen diphosphate, Diphosphoric acid, Disodium salt, Disodium acid pyrophosphate, Dinatriumpyrophosphat, Pyrophosphoric acid
Synthetic
Chelating Agent
Clean
OriginDerived from phosphoric acid and sodium compounds through synthetic chemical processes. Produced by reacting sodium phosphate or phosphoric acid with sodium hydroxide under controlled conditions.
Disodium dihydrogenpyrophosphate
Solubility Soluble in water
Formula
H2Na2O7P2
Mol. Weight
221.94
CAS #
7758-16-9
Form
Powder
State
Dry Powder; Liquid; Other Solid; Pellets or Large Crystals
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Anticorrosive
Buffering
Chelating
Grabs onto metal ions in water that would destabilize the formula. Keeps your product from going bad or changing color.
Prevents Corrosion
Stabilizes pH
Removes Metal Ions
Antioxidant Protection
Prevents product degradation
Maintains optimal pH
Binds metal ions
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.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Mixed Skin Irritation Results
3 studies / 2 irritating / 1 not irritating / reactions slight to mild (CIR 710)
Eye Irritant in Testing
2 studies / 2 irritating / reactions minimal to mild (CIR 710)
Concentration Guide
Leave-onNot reported
Rinse-off0.05–0.3%
0%50%100%
CIR reported use · 2015 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR
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