Home Safety / Compounds / Sodium tripolyphosphate (STPP / Na5P3O10 / detergent builder)

Sodium tripolyphosphate (STPP / Na5P3O10 / detergent builder) in your home: a safety profile

Low risk for your home

(Your Household-specific data is limited; this page draws from human adult context.) STPP — detergent.

What is sodium tripolyphosphate (stpp / na5p3o10 / detergent builder)?

The IUPAC name is pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate.

Also known as: 7758-29-4, Pentasodium triphosphate, STPP, Armofos.

IUPAC name
pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate
CAS number
7758-29-4
Molecular formula
Na5O10P3
Molecular weight
367.86 g/mol
SMILES
[O-]P(=O)([O-])OP(=O)([O-])OP(=O)([O-])[O-].[Na+].[Na+].[Na+].[Na+].[Na+]
PubChem CID
24455

Risk for your household

Low risk

STPP — detergent.

Regulatory consensus

3 regulatory and scientific bodies have classified Sodium tripolyphosphate (STPP / Na5P3O10 / detergent builder). The classifications differ — that's the data.

AgencyYearClassificationNotes
FDA—GRAS food additive (E451i)
EU—Phosphate limits in detergents (EU 259/2012 — max 0.3g P per wash dose for laundry)
EPA—Phosphate discharge limits for eutrophication prevention

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where your home encounter sodium tripolyphosphate (stpp / na5p3o10 / detergent builder)

  • Cleaning Products — automatic dishwasher detergent, commercial laundry, industrial cleaners
  • Food Processing — processed meats (moisture retention), frozen seafood (glaze), canned goods
  • Water Treatment — corrosion inhibitor in water distribution systems
  • Ceramics — slip casting deflocculant, ceramic glaze component

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Sodium tripolyphosphate (STPP / Na5P3O10 / detergent builder):

  • Sodium citrate
    Trade-offs: Zeolite A and sodium citrate replace phosphate builders in detergents; comparable cleaning performance at moderate hardness; less effective in very hard water; eliminates eutrophication contribution; widely adopted post-phosphate bans (EU 2013, many US states).
  • Zeolite A
    Trade-offs: Zeolite A and sodium citrate replace phosphate builders in detergents; comparable cleaning performance at moderate hardness; less effective in very hard water; eliminates eutrophication contribution; widely adopted post-phosphate bans (EU 2013, many US states).

Frequently asked questions

What products contain sodium tripolyphosphate (stpp / na5p3o10 / detergent builder)?

Sodium tripolyphosphate (STPP / Na5P3O10 / detergent builder) appears in: automatic dishwasher detergent (cleaning products); commercial laundry (cleaning products); processed meats (moisture retention) (food processing); frozen seafood (glaze) (food processing); corrosion inhibitor in water distribution systems (water treatment).

Why do regulators disagree about sodium tripolyphosphate (stpp / na5p3o10 / detergent builder)?

Sodium tripolyphosphate (STPP / Na5P3O10 / detergent builder) has been classified by 3 agencies including FDA, EU, EPA, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Sodium tripolyphosphate (STPP / Na5P3O10 / detergent builder) in the home app

Look up products containing sodium tripolyphosphate (stpp / na5p3o10 / detergent builder), compare to alternatives, and explore the full data record.

Open in home View raw API data

Sources (1)
  1. — expert_curation

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →