Overview
Methylchloroisothiazolinone/methylisothiazolinone (CAS 55965-84-9 ), commonly identified as CMIT/MIT, is a broad-spectrum biocide active against bacteria, fungi, and algae across a wide range of industrial systems.
Known commercially under trade names such as Kathon WT and Kathon 886, it is the active ingredient in Proclin preservative blends. Procurement teams source it primarily as a formulated aqueous concentrate.
In water treatment and cooling tower systems, CMIT/MIT controls microbial growth that would otherwise cause biofouling, corrosion, and process inefficiency. This ensures long-term operational stability.
Oilfield and gas operations use it as an injection biocide to suppress sulfate-reducing bacteria in produced water and pipeline systems. This prevents the degradation of critical infrastructure.
Pulp and paper mills apply it to process water and slurries to prevent slime formation that disrupts production and contaminates finished product. It is essential for maintaining high output quality.
In rinse-off personal care formulations and industrial coatings, it functions as an in-can and in-process preservative. This protects the integrity of the product against spoilage during storage.
CMIT/MIT is supplied as a stabilized aqueous solution, most commonly at 1.5% active concentration, though higher-concentration technical grades are available for industrial use. Standard supply formats include drums.
IBC totes are also available for bulk industrial procurement. Grades vary by intended application, with formulations differentiated by the CMIT-to-MIT ratio and the presence of stabilizing salts.
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Physical Properties
| Boiling Point | 100.1°C at 101.325kPa |
| Density | d20 1.19 |
| Color | Colorless to light yellow |
| Form | Liquid |
| Vapor Pressure | 0.003-17Pa at 20-45℃ |
| pH | 3.43 at 20℃ and 10g/L |
| Log P | -0.34-0.81 at 10-30℃ and pH5-9 |
Safety & Handling
Danger GHS05 GHS06 GHS09 GHS07 Hazard Statements H301 Toxic if swallowed H302 Harmful if swallowed H310 Fatal in contact with skin H311 Toxic in contact with skin H312 Harmful in contact with skin H314 Causes severe skin burns and eye damage H317 May cause an allergic skin reaction H318 Causes serious eye damage H330 Fatal if inhaled H331 Toxic if inhaled H332 Harmful if inhaled H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects H411 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. P262 Do not get in eyes, on skin, or on clothing. 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. 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. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P333+P317 Get emergency medical help. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. 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.
Other Names
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Chemical Properties
- CAS Number
- 55965-84-9
- EC Number
- 611-341-5
- Mol. Weight
- 264.8
- Category
- Heterocyclic Compounds