Methylchloroisothiazolinone
Overview
Methylchloroisothiazolinone ( CAS 26172-55-4 ), commonly known as CMIT or MCI, is a broad-spectrum biocide used to control microbial growth in water-based systems and industrial formulations.
It is most effective against bacteria, fungi, and algae, making it a standard preservation active in both industrial and consumer product manufacturing processes worldwide.
In personal care and cosmetics, CMIT is used as a preservative in rinse-off products such as shampoos, conditioners, and liquid soaps, typically in combination with MIT as a blend.
Industrial water treatment systems rely on it to prevent biofouling in cooling towers, process water circuits, and paper mill white water loops to maintain operational efficiency.
Coatings and adhesive manufacturers incorporate it into water-based paints, emulsions, and sealants to extend in-can shelf life and prevent spoilage during long-term storage.
Oilfield and metalworking applications use CMIT-based biocides to control sulfate-reducing bacteria in injection water and cutting fluid systems to prevent equipment corrosion.
CMIT is supplied as an aqueous solution, most commonly as a 1.5% or 14% active concentrate, and is rarely handled as a pure substance due to specific stability requirements.
It is available in technical grade, with supply typically governed by ISO or in-house specifications. Industrial packaging ranges from drums to IBC containers.
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Physical Properties
| Melting Point | 52 °C |
| Boiling Point | 109.7°C |
| Density | 1.25 (14% aq.) |
| Appearance | Liquid |
| Color | White |
| Odor | Pungent aromatic odor |
| Form | Liquid |
| Refractive Index | n 20/D 1.378 |
| Log P | 0.240 (est) |
Safety & Handling
Danger GHS05 GHS06 GHS07 GHS09 Hazard Statements H300 Fatal if swallowed H301 Toxic if swallowed H310 Fatal in contact with skin H311 Toxic 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 H335 May cause respiratory irritation H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects H301+H311 Toxic if swallowed or in contact with skin 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. 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. 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.
Trade & Regulatory
| HS Code | 3808929090 |
| UN Number | 1760 |
| ADR Class | 8 |
| Packing Group | II |
| Storage Class | 12 - Non Combustible Liquids |
| WGK (Germany) | 1 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 26172-55-4
- EC Number
- 247-500-7
- Mol. Weight
- 149.60
- HS Code
- 3808929090
- Category
- -