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Pharmaceutical excipients

Thimerosal

Also known as Thiomersal, Thiomersalate, Mercurothiolate

CAS 54-64-8Formula C9H9HgNaO2SMolar mass 404.82 g/molEC 200-210-4
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Serious health hazard, Hazardous to the environment 48 suppliers listed
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Thimerosal chemical structure, C9H9HgNaO2S, CAS 54-64-8
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Cream colored, crystalline powder
Melting point
232.2 to 232.8
Solubility
1 gram dissolves in about 1 ml of water
HS code
285210
Category
Pharmaceutical excipients
UN number
UN 2025
Illustrative photo, off-white crystalline powder with an amber glass bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Thimerosal?

Plain description, key identifiers and synonyms

Thimerosal is an alkylmercury compound (approximately 49% mercury by weight) used as an antiseptic and antifungal agent. It has a role as an antiseptic drug, a disinfectant, an antifungal drug and a drug allergen. It contains an ethylmercurithiosalicylate.

Thimerosal is an organomercury antiseptic and antifungal agent.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
sodium (2-carboxylatophenyl)sulfanyl-ethylmercury
CAS number
54-64-8 CAS number cross-checked
EC number
200-210-4
Molecular formula
C9H9HgNaO2S
UNII
2225PI3MOV
MDL number
MFCD00013062
INCI name
THIMEROSAL
InChIKey
RTKIYNMVFMVABJ-UHFFFAOYSA-L
InChI
InChI=1S/C7H6O2S.C2H5.Hg.Na/c8-7(9)5-3-1-2-4-6(5)10;1-2;;/h1-4,10H,(H,8,9);1H2,2H3;;/q;;2*+1/p-2
SMILES (canonical and isomeric)
CC[Hg]SC1=CC=CC=C1C(=O)[O-].[Na+]

Synonyms

  • Thiomersal
  • Thiomersalate
  • Mercurothiolate
  • Merthiolate
  • Sodium merthiolate
  • Thimerosalate
  • Thimerosalum
  • Thimerosol
  • Thimersalate
  • Thiomersalat
  • Sodium ethylmercurithiosalicylate
  • Thiomersalum
  • Merfamin
  • Mertorgan
  • Merzonin
  • Tiomersal
  • Tiomersale
  • Estivin
  • Merphol
  • Mercurothiolatum
  • Aeroaid spray
  • Merzonin sodium
  • Merthiolate salt
  • Ethylmercurithiosalicylate sodium
  • Ethylmercurithiosalicylic acid sodium salt
Show all 39 synonyms
  • Merthiolate sodium
  • Elcide 73
  • Ethyl(2-mercaptobenzoato-S)mercury sodium salt
  • Sodium ethylmercuric thiosalicylate
  • Ethylmerkurithiosalicilan sodny
  • Ethylmercurithiosalicylate sodium salt
  • o-(Ethylmercurithio)benzoic acid sodium salt
  • Ethyl (sodium o-mercaptobenzoato)mercury
  • ((o-Carboxyphenyl)thio)ethylmercury sodium salt
  • Ethylmercurithiosalicyclic acid, sodium salt
  • Mercurate(1-), ethyl(2-mercaptobenzoato(2-)-O,S)-, sodium
  • Mercurate(1-), ethyl(o-mercaptobenzoato(2-))-, sodium
  • [(o-Carboxyphenyl)thio]ethylmercury sodium salt
  • Ethyl(2-mercaptobenzoato-S)mercury, sodium salt

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
Cream colored, crystalline powderexp.
Odour
Characteristic odorexp.
Melting point
232.2 to 232.8exp.
Solubility
1 gram dissolves in about 1 ml of 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
404.82 g/molcalc.
Exact mass
405.9927 Dacalc.
LogP (octanol/water)
-1.42calc.
Topological polar surface area
40.13 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
4calc.
Heavy atoms
14calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.22calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

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

  • H300 + H310 + H330Fatal if swallowed. Fatal in contact with skin. Fatal if inhaled.
  • H300Fatal if swallowed.
  • H301Toxic if swallowed.
  • H310Fatal in contact with skin.
  • H330Fatal if inhaled.
  • H360May damage fertility or the unborn child.
  • H372Causes damage to organs through prolonged or repeated exposure.
  • H373May cause damage to organs through prolonged or repeated exposure.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (23)
  • P203Obtain, read and follow all safety instructions before use.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P262Do not get in eyes, on skin, or on clothing.
  • 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.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2025

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

Thimerosal suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 48 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

48 suppliers in 10 countries

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Thimerosal 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

An ophthalmic preservative, a topical anti-infective.

Fungicide for cotton seed treatment.

Pharmaceutic aid (preservative).

Antimicrobial preservative useful in cosmetics (from table).

Use classes: Cosmetics.

Cosmetic ingredient, INCI name THIMEROSAL(preservative)

Pharmacological actions

  • Preservatives, Pharmaceutical

Roles

  • aetiopathogenetic role
  • allergen
  • anti-HBV agent
  • antifungal agent
  • antifungal drug
  • antiinfective agent
  • antimicrobial agent
  • antiseptic drug
  • antiviral agent
  • disinfectant
  • drug allergen
  • pharmaceutical

Functional uses

  • Preservative

Cosmetic functions

  • Preservative

Pharmacology

Thimerosal is a Standardized Chemical Allergen. The physiologic effect of thimerosal is by means of Increased Histamine Release and Cell-mediated Immunity.

How it is made

Reaction between ethyl mercuric chloride and thiosalicylic acid in alcoholic sodium hydroxide

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex V, allowed preservative
    Name: THIMEROSAL, Ref no: 16, Annex ref: V/16

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 Thimerosal is traded under.

HS 2852.10Indicative HS code

Chemically defined

World exports in 2024
$7.97M
−4.4% vs 2023, imports $9.26M
2019 to 2024
Top exporters
  1. Germany34.6%
  2. Thailand18.6%
  3. India * partner reported15.5%
Top importers
  1. Germany19.2%
  2. Vietnam * partner reported17.4%
  3. Thailand6.0%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Thimerosal, based on the data on this page

What is Thimerosal?

Thimerosal is an alkylmercury compound (approximately 49% mercury by weight) used as an antiseptic and antifungal agent. It has a role as an antiseptic drug, a disinfectant, an antifungal drug and a drug allergen. It contains an ethylmercurithiosalicylate.

What is the CAS number of Thimerosal?

The CAS registry number of Thimerosal is 54-64-8.

What is the molecular formula and weight of Thimerosal?

The molecular formula of Thimerosal is C9H9HgNaO2S and its molar mass is 404.82 g/mol.

What is Thimerosal used for?

An ophthalmic preservative, a topical anti-infective. Fungicide for cotton seed treatment. Pharmaceutic aid (preservative). Antimicrobial preservative useful in cosmetics (from table). Use classes: Cosmetics.

Is Thimerosal hazardous?

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

What is the HS code of Thimerosal?

Thimerosal is usually classified under HS code 285210 (Chemically defined). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Thimerosal?

CompoundList lists 48 suppliers of Thimerosal in United States, China, Germany, India and 6 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Thimerosal in India?

5 suppliers in India list Thimerosal on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Thimerosal?

Suppliers quote Thimerosal 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 Thimerosal

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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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