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Corrosion inhibitors

2-Mercaptobenzothiazole

Also known as 2-Benzothiazolethiol, Captax, 1,3-Benzothiazole-2-thiol

CAS 149-30-4Formula C7H5NS2Molar mass 167.26 g/molEC 205-736-8
GHS signal word: Warning. Pictograms: Harmful or irritant, Hazardous to the environment 170 suppliers listed Drug substance
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2-Mercaptobenzothiazole chemical structure, C7H5NS2, CAS 149-30-4
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Pale, yellow monoclinic needles or leaflets
Melting point
180.2 to 181.7
Boiling point
Not determinable experimentally by EU Method A.2 (Boiling Temperature) due to overlappin…
Density
1.42 g/cm³ at 20 °C
Flash point
243 °C
HS code
293420
Category
Corrosion inhibitors
UN number
UN 2811
Illustrative photo, yellow pigment powder in an open kraft paper sack in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is 2-Mercaptobenzothiazole?

Plain description, key identifiers and synonyms

1,3-benzothiazole-2-thiol is 1,3-Benzothiazole substituted at the 2-position with a sulfanyl group. It has a role as a metabolite and a carcinogenic agent. It is a member of benzothiazoles and an aryl thiol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3H-1,3-benzothiazole-2-thione
CAS number
149-30-4 CAS number cross-checkedOther or deprecated CAS: 118090-09-8
EC number
205-736-8
Molecular formula
C7H5NS2
UNII
5RLR54Z22K
MDL number
MFCD00005781
InChIKey
YXIWHUQXZSMYRE-UHFFFAOYSA-N
InChI
InChI=1S/C7H5NS2/c9-7-8-5-3-1-2-4-6(5)10-7/h1-4H,(H,8,9)
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)NC(=S)S2

Synonyms

  • 2-Benzothiazolethiol
  • Captax
  • 1,3-Benzothiazole-2-thiol
  • Benzothiazolethiol
  • Mercaptobenzothiazole
  • 2(3H)-Benzothiazolethione
  • Dermacid
  • Kaptax
  • Mertax
  • Thiotax
  • Rotax
  • Accelerator M
  • Benzothiazole-2-thiol
  • Vulkacit M
  • Ekagom G
  • Mebetizole
  • Mebithizol
  • Sulfadene
  • Rokon
  • Soxinol M
  • Vulkacit Mercapto
  • Accel M
  • Kaptaks
  • Royal MBT
  • Vulkacit Mercapto/C
Show all 39 synonyms
  • Nuodeb 84
  • Pneumax MBT
  • 2-Mercaptobenzthiazole
  • Mercaptobenzothiazol
  • Mercaptobenzthiazole
  • Usaf gy-3
  • 2-Mercptobenzothiazole
  • Pennac mbt powder
  • Usaf xr-29
  • mebetizol
  • Benzothiazole-2-thione
  • 2-Benzothiazolinethione
  • Nuodex 84
  • Nocceler M

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
Pale, yellow monoclinic needles or leafletsexp.
Odour
Disagreeable odorexp.
Taste
Bitter tasteexp.
Melting point
180.2 to 181.7exp.
Boiling point
Not determinable experimentally by EU Method A.2 (Boiling Temperature) due to overlapping endothermic and exothermic reactions.exp.
Density
1.42 g/cm³ at 20 °Cexp.
Flash point
243 °Cexp.
Autoignition temperature
628 °Cexp.
Solubility
In water at 25 °C, 51 mg/L (pH 5), 118 mg/L (pH 7), 900 mg/L (pH 9)exp.
Vapour pressure
2.25 × 10⁻⁸ mm Hg at 20 °C, <1.9 × 10⁻⁶ mm Hg at 25 °Cexp.

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
167.26 g/molcalc.
Exact mass
166.9863 Dacalc.
LogP (octanol/water)
2.96calc.
Topological polar surface area
15.79 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
10calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
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, S=c1[nH]c2ccccc2s1

S=c1[nH]c2ccccc2s1

2 rings, 10 atoms. This chemical is the scaffold itself.

195 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H317May cause an allergic skin reaction.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (10)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2811
Transport hazard class
9
Packing group
III

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

2-Mercaptobenzothiazole suppliers

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Where suppliers are based

170 suppliers in 19 countries

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2-Mercaptobenzothiazole 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

The active ingredient is no longer contained in any registered products ... "cancelled.".

Fungicide for preserving textiles.

Vulcanization accelerator for rubber (requires use of stearic acid for full activation), tire treads and carcasses, mechanical specialities, etc., ... corrosion inhibitor in cutting oils and petroleum products, extreme pressure additive in greases.

Industrial uses: Other, Polymerization promoter, Chemical reaction regulator, Processing aids not otherwise specified, Corrosion inhibitor, Plasticizer, Intermediate.

Consumer uses: Plasticizer, Processing aids not otherwise specified, Polymerization promoter.

Use classes: Industrial, Pesticides, Animal Drugs.

Pharmacological actions

  • Antifungal Agents

Roles

  • aetiopathogenetic role
  • carcinogenic agent
  • metabolite

Functional uses

  • Catalyst
  • Chemical reaction regulator
  • Dispersing agent
  • Processing aids not otherwise specified

Pharmacology

2-mercaptobenzothiazole is a Standardized Chemical Allergen. The physiologic effect of 2-mercaptobenzothiazole is by means of Increased Histamine Release and Cell-mediated Immunity.

How it is made

Prepared industrially by reacting aniline, carbon disulfide, and sulfur at elevated pressure and temperature.

2-Mercaptobenzothiazole (MBT) is prepared by heating aniline, carbon disulfide, and sulfur in an autoclave at elevated temperature and pressure. Tars from the reaction can be removed by taking the crude MBT up in water by making the sodium salt, clarifying the solution, and then precipitating pure MBT with acid.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 613-108-00-3

Health and food

  • Active ingredient in FDA approved drug labels

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 2-Mercaptobenzothiazole is traded under.

HS 2934.20Indicative HS code

Compounds containing in the structure a benzothiazole ring-system (whether or not…

World exports in 2024
$662M
+4.3% vs 2023, imports $630M
2019 to 2024
Top exporters
  1. China62.9%
  2. Belgium14.6%
  3. United States5.4%
Top importers
  1. India * partner reported18.5%
  2. United States18.1%
  3. Brazil6.7%

* Partner reported figures, a lower bound.

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

The HS code shown for 2-Mercaptobenzothiazole is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 2-Mercaptobenzothiazole, based on the data on this page

What is 2-Mercaptobenzothiazole?

1,3-benzothiazole-2-thiol is 1,3-Benzothiazole substituted at the 2-position with a sulfanyl group. It has a role as a metabolite and a carcinogenic agent. It is a member of benzothiazoles and an aryl thiol.

What is the CAS number of 2-Mercaptobenzothiazole?

The CAS registry number of 2-Mercaptobenzothiazole is 149-30-4. Other or deprecated CAS numbers: 118090-09-8.

What is the molecular formula and weight of 2-Mercaptobenzothiazole?

The molecular formula of 2-Mercaptobenzothiazole is C7H5NS2 and its molar mass is 167.26 g/mol.

What is 2-Mercaptobenzothiazole used for?

The active ingredient is no longer contained in any registered products ... "cancelled.". Fungicide for preserving textiles. Vulcanization accelerator for rubber (requires use of stearic acid for full activation), tire treads and carcasses, mechanical specialities, etc., ...

Is 2-Mercaptobenzothiazole hazardous?

2-Mercaptobenzothiazole carries the GHS signal word "Warning". Main hazards: may cause an allergic skin reaction, very toxic to aquatic life, very toxic to aquatic life with long lasting effects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 2-Mercaptobenzothiazole?

2-Mercaptobenzothiazole is usually classified under HS code 293420 (Compounds containing in the structure a benzothiazole ring-system (whether or not…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 2-Mercaptobenzothiazole?

CompoundList lists 170 suppliers of 2-Mercaptobenzothiazole in China, United States, India, United Kingdom and 15 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy 2-Mercaptobenzothiazole in India?

10 suppliers in India list 2-Mercaptobenzothiazole on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of 2-Mercaptobenzothiazole?

Suppliers quote 2-Mercaptobenzothiazole 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 2-Mercaptobenzothiazole

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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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