Description

Isothiazolinones are a powerful class of synthetic biocides widely recognized for their broad-spectrum antimicrobial efficacy against bacteria, fungi, and algae. Their primary value lies in providing long-lasting preservation and preventing microbial spoilage in water-based systems and manufactured products. This makes them a critical component for industries such as paints & coatings, personal care, water treatment, and household & industrial cleaning formulations. The compound identified by CAS No. 26172-55-4 is a key commercial mixture used globally.

Application

• Paints, Coatings, and Adhesives: As an in-can preservative to prevent spoilage and maintain product integrity during storage.
• Personal Care and Cosmetics: Used in shampoos, creams, and lotions to protect against microbial contamination and extend shelf life.
• Industrial and Household Cleaners: Provides preservation for liquid detergents, disinfectants, and surface cleaners.
• Water Treatment: Acts as a slimicide in cooling towers, pulp & paper mills, and industrial process water to control microbial growth.
• Metalworking Fluids: Preserves coolant and lubricant emulsions from bacterial and fungal degradation.
• Oilfield Applications: Used in drilling muds and fracturing fluids to inhibit microbial-induced corrosion.

Basic Information

Product Name	Isothiazolinones
CAS No.	26172-55-4
Molecular Formula	Mixture (C4H4ClNOS, C4H5NOS)
Molecular Weight	Mixture (149.60 g/mol for CMIT, 115.16 g/mol for MIT)
Synonyms	3:1 Chloromethylisothiazolinone (CMIT) / Methylisothiazolinone (MIT) Blend; Kathon CG; Isothiazolinone Biocide; CMIT/MIT (3:1); 5-Chloro-2-methyl-4-isothiazolin-3-one / 2-Methyl-4-isothiazolin-3-one; Rohm and Haas Kathon; Isothiazolin-3-one derivative; Microbiocide 26172-55-4
EINECS	247-500-7

Quality Control

Our Isothiazolinones are manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including assay by HPLC and identification by FTIR, to ensure it meets precise specifications for active ingredient content and impurity profiles. Certificates of Analysis (COA) are provided with every shipment, and our quality systems support compliance with relevant global regulations such as REACH and regional cosmetic directives.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from heat, sparks, and open flame. Containers should be kept tightly sealed when not in use to prevent moisture ingress and maintain product stability.

Specification

Item	Specification
Appearance	Clear to pale yellow liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 13.5% Active Isothiazolinones (as total)
CMIT:MIT Ratio	Approx. 3:1
pH (as supplied)	2.0 - 5.0
Specific Gravity (20°C)	1.02 - 1.06

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.