Products Description of 2-Mercaptobenzimidazole CAS#583-39-1
2-Mercaptobenzimidazole, alternatively named Antioxidant MBI, is a thiol-functionalized nitrogen heterocyclic compound and a vital pharmaceutical intermediate. It has extensive applications within pharmaceutical, pesticide, fine chemical and associated industries. The pure substance exists as white to pale yellow fine crystalline powder.
This chemical features low toxicity and carries a bitter taste. Its relative density ranges from 1.40 to 1.44, with a melting point of minimum 300°C. It is soluble in ether, acetone and ethyl acetate, slightly soluble in dichloromethane, sparingly soluble in petroleum ether, yet cannot dissolve 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 | 141082 |
| 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#583-39-1
2-Mercaptobenzimidazole is widely used across rubber, metal treatment and fine chemical industries. In rubber manufacturing, it serves as a non-staining antioxidant and copper ion deactivator for natural rubber, nitrile rubber and latex, preventing thermo-oxidative aging for white, transparent and light-colored rubber products such as cable insulation, seals and automotive rubber parts. It acts as an efficient corrosion inhibitor for copper and copper alloys, forming protective films in industrial circulating water and antifreeze systems. It can also work as brightener in copper electroplating.
In pharmaceutical and agrochemical sectors, it functions as a key building block to synthesize bioactive derivatives for drug and bactericide development. It can be applied as thermal stabilizer for polyolefin plastics as well.
