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Sulfates and sulfur salts

Lead thiosulfate

Also known as Thiosulfuric acid, lead salt, Lead hyposulfite, Lead thiosulphate

CAS 13478-50-7Formula O3PbS2Molar mass 319.33 g/molEC 236-780-6
GHS signal word: Danger. Pictograms: Harmful or irritant, Serious health hazard, Hazardous to the environment
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Lead thiosulfate chemical structure, O3PbS2, CAS 13478-50-7
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White crystals
Melting point
Decomposes
Density
5.18 g/cm³
Solubility
0.03 g/100 cm³ cold water
HS code
283230
Category
Sulfates and sulfur salts
Illustrative photo, colourless crystals beside an amber glass bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Lead thiosulfate?

Plain description, key identifiers and synonyms

Lead thiosulfate is a white crystalline solid. Sinks and mixes slowly with water. (USCG, 1999)

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dioxido-oxo-sulfanylidene-λ6-sulfane, lead(2+)
CAS number
13478-50-7 CAS number cross-checkedOther or deprecated CAS: 26265-65-6
EC numbers
236-780-6, 247-566-7
Molecular formula
O3PbS2
UNII
42K67499I7
InChIKey
FKPGNMBJYBPNHL-UHFFFAOYSA-L
InChI
InChI=1S/H2O3S2.Pb/c1-5(2,3)4;/h(H2,1,2,3,4);/q;+2/p-2
SMILES (canonical and isomeric)
[O-]S(=O)(=S)[O-].[Pb+2]

Synonyms

  • Thiosulfuric acid, lead salt
  • Lead hyposulfite
  • Lead thiosulphate
  • Thiosulphuric acid, lead salt
  • Thiosulfuric acid (H2S2O3), lead salt
  • Thiosulfuric acid (H2S2O3), lead(2+) salt (1:1)
  • Lead thiosulfic acid
  • lambda2-lead(2+) ion sulfanidesulfonate
  • Lead(II) thiosulfate
  • dioxido-oxo-sulfanylidene-lambda6-sulfane, lead(2+)
  • Lead thiosulfate (PbS2O3)
  • Thiosulfuric acid lead(2+) salt
  • PbS2O3

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 crystalsexp.
Melting point
Decomposesexp.
Density
5.18 g/cm³exp.
Solubility
0.03 g/100 cm³ cold waterexp.

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
319.33 g/molcalc.
Exact mass
319.9055 Dacalc.
LogP (octanol/water)
-1.39calc.
Topological polar surface area
63.19 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
0calc.
Heavy atoms
6calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H332Harmful if inhaled.
  • H360May damage fertility or the unborn child.
  • H373May cause damage to organs through prolonged or repeated exposure.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (20)
  • P203Obtain, read and follow all safety instructions before use.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • 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.

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

Lead thiosulfate suppliers

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Lead thiosulfate price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Used in photography (Thiosulfates).

How it is made

By interaction of solutions of lead nitrate and sodium thiosulfate, concn and crystallization.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Inactive 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 Lead thiosulfate is traded under.

HS 2832.30Indicative HS code

Thiosulphates

World exports in 2024
$112M
+10.8% vs 2023, imports $96.9M
2019 to 2024
Top exporters
  1. United States43.5%
  2. China14.6%
  3. Belgium12.3%
Top importers
  1. Mexico10.4%
  2. United States10.0%
  3. Canada7.6%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Lead thiosulfate, based on the data on this page

What is Lead thiosulfate?

Lead thiosulfate is a white crystalline solid. Sinks and mixes slowly with water. (USCG, 1999)

What is the CAS number of Lead thiosulfate?

The CAS registry number of Lead thiosulfate is 13478-50-7. Other or deprecated CAS numbers: 26265-65-6.

What is the molecular formula and weight of Lead thiosulfate?

The molecular formula of Lead thiosulfate is O3PbS2 and its molar mass is 319.33 g/mol.

What is Lead thiosulfate used for?

Used in photography (Thiosulfates).

Is Lead thiosulfate hazardous?

Lead thiosulfate carries the GHS signal word "Danger". Main hazards: harmful if swallowed, harmful in contact with skin, harmful if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Lead thiosulfate?

Lead thiosulfate is usually classified under HS code 283230 (Thiosulphates). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Lead thiosulfate?

Post a free request on CompoundList and suppliers of Lead thiosulfate will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Lead thiosulfate?

Suppliers quote Lead thiosulfate on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Lead thiosulfate

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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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