Overview
Methylene bis(thiocyanate) (CAS 6317-18-6 ), also known as methylene dithiocyanate or MBT, is a broad-spectrum biocide used to control microbial growth in industrial water systems and process fluids.
Proxel MB is a recognized trade form of this active. Its primary commercial value lies in preventing bacterial and algal fouling in recirculating systems and industrial processes.
In water treatment and cooling tower systems, MBT controls slime-forming bacteria and algae that reduce heat exchange efficiency and damage infrastructure. This ensures long-term operational stability.
Pulp and paper manufacturers use it to suppress microbial contamination in process water and white water circuits. Unchecked growth in these environments causes sheet defects and equipment fouling.
Oil and gas operations apply MBT to injection water and produced water systems. This inhibits sulfate-reducing bacteria responsible for microbiologically influenced corrosion in pipelines and storage tanks.
Personal care formulators have incorporated it as a preservative active in rinse-off and industrial cosmetic formulations. It is selected for applications where broad-spectrum efficacy is required.
Methylene bis(thiocyanate) is supplied as a liquid concentrate, typically in aqueous solution, and as a technical-grade solid. Standard commercial supply is at technical grade for most industrial uses.
Solution concentrations vary by supplier and end-use requirement. Buyers should confirm active content and formulation compatibility when evaluating supply options across different grades for their specific needs.
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Physical Properties
| Melting Point | 105-107 °C |
| Boiling Point | 285.2±23.0 °C(Predicted) |
| Density | 1.492 (estimate) |
| Flash Point | >110°C |
| Appearance | yellow crystalline powder |
| Color | White to Light yellow to Light orange |
| Form | solid |
| Water Solubility | Decomposes in water. Slightly soluble in organic solvents. |
| Refractive Index | 1.5300 (estimate) |
Safety & Handling
Danger GHS05 GHS06 GHS09 GHS07 GHS08 Hazard Statements H301 Toxic if swallowed H314 Causes severe skin burns and eye damage H315 Causes skin irritation H317 May cause an allergic skin reaction H318 Causes serious eye damage H330 Fatal if inhaled H371 May cause damage to organs H372 Causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects Precautionary Statements P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P320 Specific treatment is urgent (see … on this label). P321 Specific treatment (see … on this label). P330 Rinse mouth. P363 Wash contaminated clothing before reuse. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P301+P330+P331 Rinse mouth. Do NOT induce vomiting. P302+P361+P354 IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29309090 |
| UN Number | 2811 |
| ADR Class | 6.1 |
| Packing Group | II |
| WGK (Germany) | 3 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 6317-18-6
- EC Number
- 228-652-3
- Mol. Weight
- 130.20
- HS Code
- 29309090
- Category
- Flavors & Fragrances