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Sulfates and sulfur salts

Thallous sulfate

Also known as Thallium sulfate, Tharattin, Zelio

CAS 7446-18-6Formula O4STl2Molar mass 504.83 g/molEC 231-201-3
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Serious health hazard, Hazardous to the environment Controlled, licensed buyers only
Request as a licensed buyer Safety data
Thallous sulfate chemical structure, O4STl2, CAS 7446-18-6
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White, rhomboid prisms
Melting point
632 °C
Boiling point
Decomposes
Density
6.77 g/cm³
Solubility
Solubility in 100 ml water at 0 °C: 2.70 g, at 20 °C: 4.87 g, at 100 °C: 18.45 g
HS code
283329
Category
Sulfates and sulfur salts
UN number
UN 1707

What is Thallous sulfate?

Plain description, key identifiers and synonyms

Thallium sulfate is a metal sulfate in which the counterion is thallium and the ratio of thallium to sulfate is 2:1. It is a rodenticide used to control rats, squirrels, mice, moles, prairie dogs, ants and cockroaches. It is no longer registered for pesticide use in the United States. It has a role as an insecticide and a rodenticide. It is a thallium molecular entity and a metal sulfate. It contains a sulfate and a thallium(1+).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
bis(thallium(1+)), sulfate
CAS number
7446-18-6 CAS number cross-checkedOther or deprecated CAS: 10031-59-1
EC number
231-201-3
Molecular formula
O4STl2
UNII
U9F9QIR12T
MDL number
MFCD00011278
InChIKey
YTQVHRVITVLIRD-UHFFFAOYSA-L
InChI
InChI=1S/H2O4S.2Tl/c1-5(2,3)4;;/h(H2,1,2,3,4);;/q;2*+1/p-2
SMILES (canonical and isomeric)
[O-]S(=O)(=O)[O-].[Tl+].[Tl+]

Synonyms

  • Thallium sulfate
  • Tharattin
  • Zelio
  • Bonide antzix
  • Th-Universal
  • Thallium sulphate
  • Dithallium sulfate
  • Dithallium(1+) sulfate
  • Eccothal
  • CSF-giftweizen
  • M7-Giftkoerner
  • Rattengiftkonserve
  • M 7-Giftkoerner
  • Sulfuric acid, thallium salt
  • Thallium(1) sulfate
  • Thallium sulfate (Tl2SO4)
  • Thallium sulfate, solid (DOT)
  • Thallous sulphate
  • Sulfuric acid, thallium(1+) salt
  • Sulfuric acid dithallium(1+) salt
  • Dithallium(I) sulfate
  • Thallium(I) sulfate
  • RCRA waste number P115
  • RCRA waste no. P115
  • Dithallium sulphate
Show all 34 synonyms
  • Thallium (I) sulfate
  • C.F.S. (VAN)
  • thallium monosulfate
  • Sulfuric acid, thallium salt (1:1)
  • thallium(1+), sulfate
  • O4STl2
  • Thallium sulfuricum
  • Thallium sulphuricum
  • Thallium sulfate (ous)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
White, rhomboid prismsexp.
Odour
Odorlessexp.
Melting point
632 °Cexp.
Boiling point
Decomposesexp.
Density
6.77 g/cm³exp.
Solubility
Solubility in 100 ml water at 0 °C: 2.70 g, at 20 °C: 4.87 g, at 100 °C: 18.45 gexp.
Vapour pressure
Zeroexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
504.83 g/molcalc.
Exact mass
505.9006 Dacalc.
LogP (octanol/water)
-2.1calc.
Topological polar surface area
80.26 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
0calc.
Heavy atoms
7calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H300Fatal if swallowed.
  • H315Causes skin irritation.
  • H372Causes damage to organs through prolonged or repeated exposure.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (15)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1707
Transport hazard class
6.1
Packing group
II

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Thallous sulfate suppliers

Controlled substance, listings of documented suppliers only, in the documented ranking

Pesticide toxic

Thallous sulfate is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Licensed buyers only, every enquiry is reviewed by our compliance team.

Reference: Highly toxic substance

Our policy on controlled substances
No documented supplier lists it yet

Licensed buyers can post a request for Thallous sulfate with their licence. Our compliance team reviews it before suppliers see it.

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Thallous sulfate price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

As a rat poison (former), as an ant bait (former), and as a reagent in analytical chemistry.

Analysis (testing for iodine in the presence of chlorine), ozonometry.

Chemical intermediate for other thallium compds & thallium metal.

Insecticides, rodenticides (Thallous sulfate).

Rodenticide, insecticide bait ingredient, mammal control agent (former use).

Pharmacological actions

  • Rodenticides

Roles

  • insecticide
  • pesticide
  • rodenticide

How it is made

Reaction of thallium metal & sulfuric acid followed by crystallization, separation from flue dusts resulting from roasting of zinc blende & lead sulfide ores via direct leaching with water or dilute acid

Reaction of the metal with sulfuric acid and concentration of the solution until crystallization begins

By dissolving thallous hydroxide or nitrate by recrystallization from water

Regulatory status

Inventories, regulations and trade controls that list this substance

Pesticide toxic

Thallous sulfate is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Licensed buyers only, every enquiry is reviewed by our compliance team.

Reference: Highly toxic substance

Our policy on controlled substances

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 081-003-00-4

Other lists

  • Other regulatory list

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Thallous sulfate is traded under.

HS 2833.29Indicative HS code

Sulphates, alums, peroxosulphates (persulphates), other

World exports in 2024
$1.1B
−26.3% vs 2023, imports $1.41B
2019 to 2024
Top exporters
  1. China35.9%
  2. Germany8.8%
  3. Mexico7.6%
Top importers
  1. China16.7%
  2. United States13.5%
  3. Japan10.1%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Thallous sulfate is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Thallous sulfate, based on the data on this page

What is Thallous sulfate?

Thallium sulfate is a metal sulfate in which the counterion is thallium and the ratio of thallium to sulfate is 2:1. It is a rodenticide used to control rats, squirrels, mice, moles, prairie dogs, ants and cockroaches. It is no longer registered for pesticide use in the United States.

What is the CAS number of Thallous sulfate?

The CAS registry number of Thallous sulfate is 7446-18-6. Other or deprecated CAS numbers: 10031-59-1.

What is the molecular formula and weight of Thallous sulfate?

The molecular formula of Thallous sulfate is O4STl2 and its molar mass is 504.83 g/mol.

What is Thallous sulfate used for?

As a rat poison (former), as an ant bait (former), and as a reagent in analytical chemistry. Analysis (testing for iodine in the presence of chlorine), ozonometry. Chemical intermediate for other thallium compds & thallium metal. Insecticides, rodenticides (Thallous sulfate).

Is Thallous sulfate hazardous?

Thallous sulfate carries the GHS signal word "Danger". Main hazards: fatal if swallowed, causes skin irritation, causes damage to organs through prolonged or repeated exposure. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Thallous sulfate?

Thallous sulfate is usually classified under HS code 283329 (Sulphates, alums, peroxosulphates (persulphates), other). This is indicative, confirm it with your customs broker before shipping.

Can I buy Thallous sulfate on CompoundList?

Thallous sulfate is a controlled substance. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed by our compliance team before suppliers see it.

Guides for buyers

Practical guides that help when you source, ship or handle Thallous sulfate

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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