Ingredient Dictionary

TRIPOTASSIUM PHOSPHATE

Tripotassium phosphate is an inorganic potassium salt that is the tripotassium salt of phosphoric acid.

Definition

Tripotassium phosphate is an inorganic potassium salt that is the tripotassium salt of phosphoric acid. It is an inorganic phosphate salt and an inorganic potassium salt.

Source: PubChem

US FDA substance register · UNII 16D59922JU · registered name POTASSIUM PHOSPHATE, TRIBASIC · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Tripotassium Phosphate is the inorganic salt that conforms to the formula:

Cosmetic roles

Keeps pH steadyBUFFERING

Safety & regulatory references

Not classified under Korea’s toxic-substance GHS list · existing chemical substance

Source: Korea toxic substances GHS register (NIER)

More data — names, identifiers, properties, test records, literature

Names & identifiers

TRIPOTASSIUM PHOSPHATEINCIPhosphoric acid, tripotassium saltSynonym

CAS No.chemical registry number: 7778-53-2
EC No.EU chemical inventory number: 231-907-1
DTXSIDUS EPA chemical ID: DTXSID3043994
DTXCIDUS EPA compound ID: DTXCID1023994

IUPAC: Tripotassium phosphate
Molecular formula: K3O4P
Molecular weight: 212.265 g/mol

Measured properties

Appearance: Other Solid · Other Solid, Dry Powder, Liquid
Solubility: Freely soluble in water. Insoluble in ethanol
pH: Between 11,5 and 12,3 (1 % solution)
Molecular weight: 212.27

Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.

Source: PubChem · KOSHA safety data sheets (Korea)

What products actually use it for

What the 13 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.

pH regulating agent4
Corrosion inhibitor2
Emulsifier1
Thickening agent1
Adhesion/cohesion promoter1
Ion exchange agent1
Processing aids not otherwise specified1
Chelating agent1

1 other uses

Cleaning agent1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

7 skin studies and 4 eye studies are on record.

Classed as moderate1Classed as low3

The studies disagree (the most common conclusion covers 25%), so they do not establish that this ingredient is irritating. These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 11 studies

Category 6.3A (Category 2)
Skin Irritation · Read Across
Classification not possible
Skin Sensitization · Screening
Studies Indicate No Significant Irritation
skin corrosion: in vitro / ex vivo · Screening · OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method) according to EU Method B.46 (In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test) according to
Category 1
Skin Irritation · Screening
Skin corrosion/irritation - Category 2
Skin Irritation · Screening
Studies Indicate No Significant Irritation
skin irritation: in vivo · Screening · other guideline: No data according to
Not likely to be sensitizing
skin sensitisation: in vivo (LLNA) · Screening · according to OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay) according to EU Method B.42 (Skin Sensitisation: Local Lymph Node Assay)
Serious eye damage/eye irritation - Category 1
Eye Irritation · Screening
Corrosive or Irritation Persists for > 21 days
eye irritation: in vivo · Screening · other guideline: Code of Federal Regulation, Section 1500.42 according to
Category 6.4A (Category 2A)
Eye Irritation · Read Across
Category 1
Eye Irritation · Screening