2-mercaptobenzothiazole
CAS Number
149-30-4
EC Number
205-736-8
Abbreviation
MBT
What is 2-mercaptobenzothiazole?
2-Mercaptobenzothiazole (CAS 149-30-4), commonly known as MBT or Captax, is a primary accelerator and intermediate used in rubber processing, industrial preservation, and specialty chemical synthesis.
Where is 2-mercaptobenzothiazole used?
- Rubber and tire manufacturing: accelerates sulfur crosslinking, improving cure efficiency and mechanical performance in natural and synthetic elastomers
- Industrial metalworking fluids and cooling water systems: copper corrosion inhibitor forming a protective complex on metal surfaces
- Biocide controlling microbial growth in cutting fluids, adhesives, and polymer dispersions
- Synthesis intermediate for benzothiazole-based accelerator derivatives such as MBTS and CBS
Commercial specifications
- Purity typically 95% to 98% or higher depending on application
- Bulk supply in bags or drums
Other Names (Synonyms)
Captax|benzothiazolyl mercaptan|2-sulfanyl-1,3-benzothiazole|2-MBT|2-Benzothiazolethiol|1,3-Benzothiazol-2-yl hydrosulfide|MBT|1,3-Benzothiazole-2-thiol
What are the physical properties of 2-mercaptobenzothiazole?
Melting Point 180.2-181.7 °C
Boiling Point 223°C (rough estimate)
Density 1.42 g/cm³
Flash Point 243 °C
Appearance beige or light yellow powder with a faint odour
Color Yellow
Odor Odorless
Form Powder
Water Solubility <0.1 g/100 mL at 19 ºC
Vapor Pressure <0.000003 hPa (25 °C)
Refractive Index 1.6100 (estimate)
pH 7 (0.12g/l, H2O, 25℃)
Log P 2.86
How is 2-mercaptobenzothiazole classified and handled safely? Learn More
Warning
GHS07· Irritant GHS09· Environmental Hazard GHS08· Health Hazard
Hazard Statements
H317 May cause an allergic skin reaction
H350 May cause cancer
H351 Suspected of causing cancer
H400 Very toxic to aquatic life
H410 Very toxic to aquatic life with long lasting effects
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P272 Contaminated work clothing should not be allowed out of the workplace.
P273 Avoid release to the environment.
Which trade and regulatory codes apply to 2-mercaptobenzothiazole?
HS Code 29342020
UN Number 3077
ADR Class 9
Packing Group III
Storage Class 11 - Combustible Solids
WGK (Germany) 2