Potassium Metaphosphate
AKA “Metaphosphoric acid potassium salt, EINECS 232-212-6, UNII-01DMT14Z63, potassium oxophosphinate, monopotassium metaphosphate, Potassium metaphosphate (kpo3)
Synthetic
Ingredient Facts
Potassium metaphosphate
AKA: Metaphosphoric acid potassium salt, EINECS 232-212-6, UNII-01DMT14Z63, Potassium oxophosphinate, Monopotassium metaphosphate, Potassium metaphosphate (kpo3)
Synthetic · Cleansing · EWG: 4
Synthetic
Cleanser
Chelating Agent
Synthetic
Clean
A gentle cleansing agent that removes impurities and oil from skin and hair, leaving them clean without stripping away natural moisture.
Solubility 1 g dissolves in 100 ml of a 1 in 25 solution of sodium acetate
Formula
KO3P
Mol. Weight
118.07
CAS #
7790-53-6
Form
Powder
State
Fine white powder or crystals or colourless glassy platelets
See origin →
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Chelating Agent
Grabs onto metal ions in water that would destabilize the formula. Keeps your product from going bad or changing color.
Cleansing Surfactant
Removes Impurities
Traditional Use
Synthetic compound developed in the 20th century primarily used in cosmetics as a chelating agent and water softener to improve formula stability and performance.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR