5-Chloro-2-methyl-4-isothiazolin-3-one (CMIT) CAS 26172-55-4

Chemical Name: 5-Chloro-2-methyl-4-isothiazolin-3-one

Synonymous Names: CMIT; CIT; Methylchloroisothiazolinone; Chloromethylisothiazolinone

CAS No.: 26172-55-4

Molecular Formula: C4H4ClNOS

Molecular Weight: 149.60 g/mol

EINECS Number: 247-500-7

Function: Antimicrobial / Preservative Active Ingredient

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Description
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Foconsci’s CMIT is an isothiazolinone antimicrobial used to control bacteria, yeast and mold in water-based products.

It is mainly used in industrial preservation systems for paints, polymer dispersions, adhesives, metalworking fluids, construction chemicals and process water.

CMIT is also commonly combined with Methylisothiazolinone (MIT). Our CMIT/MIT preservatives use the 2 actives together at 3:1 ratio. Contact our sales team to get a quote.

Structural formula:

Product Description

Item	Description
Product name	5-Chloro-2-methyl-4-isothiazolin-3-one
CAS Number	26172-55-4
Molecular formula	C4H4ClNOS
Molecular weight	149.6 g/mol
Boiling point	200.2°C
Flash point	74.9°C
Appearance	Light yellow to amber liquid

Applications of CMIT

Paints and Coatings: CMIT controls bacterial and fungal growth in water-based paints and coatings during storage.

Polymer Dispersions and Adhesives: CMIT protects latex, polymer dispersions, glues and other water-based formulations from microbial spoilage.

Metalworking Fluids: CMIT helps control microbial growth in water-containing metalworking emulsions and process fluids.

Construction Chemicals: CMIT can preserve water-based concrete additives, filler suspensions and other construction formulations that are prone to bacterial or fungal contamination.

Industrial Water Systems: CMIT can control microorganisms in process water, wash water and selected industrial water-treatment systems.

Biocide Formulations: CMIT also serves as an active ingredient for preparing industrial preservative and antimicrobial formulations.

Packaging and Storage:

Packaging: 25 kg/drum or 200 kg/drum

Storage: Store in a cool, dry, and well-ventilated warehouse, away from direct sunlight and heat sources. Keep sealed. This product is corrosive — handle with appropriate protective equipment.