2-Mercaptobenzimidazole CAS#583-39-1
Versatile Industrial Intermediate：Antioxidant MBI (2-mercaptobenzimidazole) is an important pharmaceutical intermediate widely used in medicine, pesticides, chemicals, and related industries.
High Thermal Stability：With a melting point of ≥285 °C, MBI offers excellent thermal stability, making it suitable for high-temperature processing and demanding applications.
Favorable Chemical Solubility Profile：It is soluble in common organic solvents such as ether, acetone, and ethyl acetate, facilitating formulation and chemical synthesis, while remaining insoluble in water.
Safe and Stable Solid Form：Supplied as a white to light yellow fine crystalline powder, MBI is non-toxic and easy to handle, store, and transport for industrial and research use.
Product Description of 2-Mercaptobenzimidazole (CAS No. 583-39-1)
Antioxidant MBI, also known as 2-mercaptobenzimidazole, is a thiol-substituted nitrogen-containing heterocyclic compound and an important pharmaceutical intermediate. It is widely applied in the fields of medicine, pesticides, chemicals, and related industries.
The pure product appears as a white to light yellow fine crystalline powder. It is non-toxic, has a bitter taste, and exhibits a relative density of 1.40–1.44. The melting point is not less than 285 °C. The compound is soluble in ether, acetone, and ethyl acetate, sparingly soluble in petroleum ether and dichloromethane, and insoluble in carbon tetrachloride, benzene, and water.
2-Mercaptobenzimidazole Chemical Properties
| Melting point | 300-304 °C (lit.) |
| Boiling point | 270.6±23.0 °C(Predicted) |
| Density | 1.42 |
| Vapor pressure | 0-0.001Pa at 25℃ |
| Refractive index | 1.5500 (estimate) |
| Fp | >250°C |
| Storage temp | 2-8°C |
| Solubility | 0.3g/l |
| Form | Powder |
| Pka | 10.24±0.10(Predicted) |
| Color | White to beige |
| Water Solubility | <0.1 g/100 mL at 23.5 ºC |
| Merck | 141,082 |
| BRN | 119867 |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| LogP | 0.88-1.66 at 20-25℃ |
| CAS DataBase Reference | 583-39-1(CAS DataBase Reference) |
| NIST Chemistry Reference | 2-Mercaptobenzimidazole(583-39-1) |
| EPA Substance Registry System | 2-Mercaptobenzimidazole (583-39-1) |
Safety Information
| Hazard Codes | Xn |
| Risk Statements | 20/21/22-36/37/38-22 |
| Safety Statements | 26-36-24/25 |
| RIDADR | UN 2811 6.1/PG 3 |
| WGK Germany | 2 |
| RTECS | DE1050000 |
| Autoignition Temperature | 480 °C |
| TSCA | Yes |
| HazardClass | 6.1 |
| PackingGroup | III |
| HS Code | 29339910 |
| Toxicity | LD50 orally in Rabbit: 300 mg/kg |
Product Application of 2-Mercaptobenzimidazole (CAS No. 583-39-1)
Antioxidant MB is a primary non-staining antioxidant used in the rubber industry, effectively reducing rubber discoloration during the vulcanization process. It is suitable for the production of transparent, white, and brightly colored rubber products, as well as heat-resistant and foamed materials. The product does not cause color change and does not introduce contamination.
