Chloromethylisothiazolinone
CMIT, MCI, 5-Chloro-2-methyl-4-isothiazolin-3-one.
- CAS
- 26172-55-4
- EC
- 247-500-7
- Sectors
- Water & Wastewater Treatment, Coatings, Adhesives, Sealants & Elastomers, Personal Care & Cosmetics
Chloromethylisothiazolinone (CAS 26172-55-4) is a broad-spectrum isothiazolinone biocide supplied as a white liquid, typically used in combination with Methylisothiazolinone (MIT) to control bacteria, algae and fungi in aqueous systems, paints, adhesives and cooling water. This preservative solution is highly effective at very low concentrations , making it an economical choice for industrial preservation. It is stable over a wide pH range and is compatible with anionic and cationic surfactants . As a biocidal active , it prevents biofilm formation and spoilage in paints, adhesives, and cooling water systems. It provides long-lasting protection for products during storage and industrial use.
Typical Properties
| Molecular formula | C4H4ClNOS |
|---|---|
| Molecular weight | 149.6 g/mol |
| Appearance | Liquid |
| Form | Liquid |
| Color | White |
| Odor | Pungent aromatic odor |
| Melting point | 52 °C |
| Boiling point | 109.7°C |
| Density | 1.25 (14% aq.) |
| GHS signal word | Danger · Corrosive, Acute toxicity, Irritant / harmful, Environmental hazard |
| HS code | 3808929090 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Chloromethylisothiazolinone
Applications
- Water Treatment: Used in industrial cooling towers and paper mills to prevent microbial fouling and slime.
- Preservation: Protects paints, emulsions, and detergents from bacterial degradation and fungal growth.
- Personal Care: Used in rinse-off products like shampoos (typically in CMIT/MIT blends) to maintain sterility.
Safety & Risks
Classified as Skin Sensitizer (Category 1) and Corrosive. Requires Protective Coveralls, Chemical Gloves, and Eye Protection; avoid any skin contact.
Packaging
Available in 25 kg Pails, 200 kg Drums, and 1000 kg IBC Tanks.