Outdoor & Yard / Compounds / Triphenyltin (TPT)

Triphenyltin (TPT) in the yard and garden

Elevated risk for your yard

Immunotoxic. Potent aromatase inhibitor — disrupts estrogen biosynthesis. Neurotoxic at high doses.

What is triphenyltin (tpt)?

CAS number
668-34-8
Molecular formula
C18H16Sn
Molecular weight
351.03 g/mol
SMILES
C1=CC=C(C=C1)[Sn](C2=CC=CC=C2)C3=CC=CC=C3
PubChem CID
11476

Risk for people, pets,

Elevated risk

Immunotoxic. Potent aromatase inhibitor — disrupts estrogen biosynthesis. Neurotoxic at high doses.

Regulatory consensus

2 regulatory and scientific bodies have classified Triphenyltin (TPT). The classifications differ — that's the data.

AgencyYearClassificationNotes
EU2002Banned — not approved as pesticide; REACH restricted
EPA2002All food uses cancelled

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 yard encounter triphenyltin (tpt)

  • Pesticide
  • Industrial Chemical

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Triphenyltin (TPT):

  • Mancozeb (dithiocarbamate)
    Trade-offs: Alternative approach; specific tradeoffs depend on application context, scale, and regulatory requirements. Full hazard assessment of alternative recommended before adoption to avoid regrettable substitution.
    Relative cost: 1.2-2×
  • Copper fungicides
    Trade-offs: Alternative approach; specific tradeoffs depend on application context, scale, and regulatory requirements. Full hazard assessment of alternative recommended before adoption to avoid regrettable substitution.
    Relative cost: 1.2-2×

Frequently asked questions

Is triphenyltin (tpt) safe for your yard?

Immunotoxic. Potent aromatase inhibitor — disrupts estrogen biosynthesis. Neurotoxic at high doses.

See Triphenyltin (TPT) in the outdoor app

Look up products containing triphenyltin (tpt), compare to alternatives, and explore the full data record.

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Sources (1)
  1. —

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 →