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
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
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
Traditional Use
Identified as a phosphate compound in 19th-century chemistry. Adopted in cosmetics in the 20th century as a sequestrant and chelating agent to improve product stability.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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