Description

2-Methyl-4,5-Trimethylene-4-Isothiazolin-3-One is a highly effective, broad-spectrum biocide belonging to the isothiazolinone class. It matters for its potent antimicrobial activity against bacteria, fungi, and algae, making it a critical component for preserving the integrity and shelf-life of water-based formulations. Industries requiring robust in-can and dry-film protection, such as paints, coatings, adhesives, and metalworking fluids, rely on this compound to prevent microbial spoilage and ensure product performance.

Application

• Paints & Coatings: Primary in-can preservative for latex, acrylic, and other water-based paints to prevent bacterial and fungal degradation.
• Adhesives & Sealants: Preservation of water-based adhesive formulations during storage and in the applied film.
• Metalworking Fluids: Key biocide in synthetic and semi-synthetic fluids to control microbial growth, preventing odor, corrosion, and fluid breakdown.
• Construction Chemicals: Used in cement additives, grouts, and other wet-state building materials to inhibit microbial contamination.
• Household & Industrial Cleaners: Preservation of liquid soaps, detergents, and surface cleaners to maintain stability and efficacy.
• Pulp & Paper: Slime control agent in paper mill process waters and preservation of starch-based coatings.
• Oilfield Applications: Microbiocide in drilling muds, fracturing fluids, and produced water systems.
• Leather & Textile Processing: Preservation of process liquors and finished products susceptible to microbial attack.

Basic Information

Product Name	2-Methyl-4,5-Trimethylene-4-Isothiazolin-3-One
CAS No.	82633-79-2
Molecular Formula	C7H9NOS
Molecular Weight	155.22 g/mol
Synonyms	4,5-Dihydro-5-methyl-2-(3H)-isothiazolone, bicyclic; 2-Methyl-4-isothiazolin-3-one, 4,5-trimethylene derivative; 4,5-Trimethylene-2-methyl-4-isothiazolin-3-one; Bicyclic isothiazolinone; 5-Methyl-1,2-thiazol-3(2H)-one, 4,5,6,7-tetrahydro-; MTI; Preservative (MTI)
EINECS	Contact for details

Quality Control

Our 2-Methyl-4,5-Trimethylene-4-Isothiazolin-3-One is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, potency, and compliance with relevant industry specifications for biocidal active substances. A comprehensive Certificate of Analysis (COA) documenting identity, assay, and impurity profiles is provided with each shipment.

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 strong acids, strong bases, and reducing agents. For long-term storage, consider under an inert atmosphere to maintain optimal stability.

Specification

Item	Specification
Appearance	Off-white to pale yellow powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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