Product Overview

CAS 55965-84-9 is the registered identity of the CMIT/MIT isothiazolinone reaction mass: 5-chloro-2-methyl-2H-isothiazol-3-one and 2-methyl-2H-isothiazol-3-one combined at the standard 3:1 ratio, carrying approximately 14 percent active matter and stabilised with magnesium nitrate and magnesium chloride in water. The magnesium salt system is what distinguishes this substance from the two active components listed separately, and it is what keeps the chlorinated isothiazolinone stable in aqueous storage. The product is supplied as a pale yellow clear liquid, fully miscible with water, and is used as a broad-spectrum preservative and biocide across rinse-off personal care formulations, household cleaners, waterborne coatings, polymer emulsions, paper systems and industrial water circuits.

Key Attributes

Key Highlights

• MAGNESIUM SALT STABILISED: Formulated with magnesium nitrate and magnesium chloride, the stabiliser system that keeps the chlorinated isothiazolinone intact through aqueous storage and long transport cycles.
• SINGLE REGISTERED CAS: Supplied under CAS 55965-84-9 as one reaction mass rather than as two separate actives, which simplifies ingredient listing and incoming documentation for formulators.
• BROAD SPECTRUM ACTIVITY: Controls gram-positive and gram-negative bacteria, yeasts, moulds and algae, so a single preservative covers the full spoilage profile of a water-based formulation.
• EFFECTIVE AT LOW USE LEVEL: Irreversibly inactivates microbial proteins, delivering preservation at ppm-level addition rates instead of requiring high loading.
• FORMULATION FRIENDLY: Water soluble, non foaming and compatible with anionic, cationic and nonionic surfactant systems commonly used in rinse-off products and cleaning formulations.
• WIDE WORKING pH WINDOW: Performs across systems running from about pH 2.0 up to pH 9.0, with best stability when added below 80 C.
• CLEAN BREAKDOWN: Readily deactivates after use and is biodegradable, leaving no persistent residue in the finished product or in discharged water.
• BULK SUPPLY READY: Minimum order quantity of 1 metric ton, packed in 25 kg drums, 200 kg or 250 kg drums and 1000 kg IBC tanks. Shipment arranged within 3 weeks.

Product Description

CAS 55965-84-9 identifies the CMIT/MIT isothiazolinone reaction mass, produced by combining 5-chloro-2-methyl-2H-isothiazol-3-one with 2-methyl-2H-isothiazol-3-one at a 3:1 ratio. The commercial liquid carries approximately 14 percent total active matter, with the balance made up of water and the magnesium nitrate and magnesium chloride stabiliser system. The result is a pale yellow, water-clear liquid that mixes directly into aqueous systems without pre-dilution and without introducing foam.

The magnesium salts are not an optional extra. The chlorinated isothiazolinone component is prone to decomposition in dilute aqueous solution, and the magnesium nitrate and magnesium chloride system is what maintains active content through warehouse storage and ocean transit. Buyers comparing quotations for this chemistry should confirm whether the offered material carries the same stabiliser package, because unstabilised blends lose active matter over time and give inconsistent preservation results in the finished product.

In use, the product acts by breaking bonds in microbial proteins and cell structures, producing rapid and irreversible loss of viability rather than a temporary growth pause. That mechanism gives useful activity against both free-floating microorganisms in the water phase and against attached growth and biofilm forming on surfaces, which is why the same chemistry serves rinse-off personal care formulations, household cleaners, in-can preservation of coatings and emulsions, paper mill systems and industrial water circuits.

Dideu Group supplies CAS 55965-84-9 in industrial quantities with a minimum order quantity of 1 metric ton. Standard lead time is within 3 weeks of order confirmation, with shipment by sea. Each consignment ships with a certificate of analysis covering active matter content, CMIT to MIT ratio, pH, density and appearance. Payment is accepted by T/T and L/C, and the product is sold into global markets.

Applications

Personal Care and Cosmetics, Rinse-off Products

Used as a preservative in rinse-off personal care formulations including shampoo, conditioner, body wash, liquid soap, facial cleanser and shower gel, where it protects the water phase against bacterial, yeast and mould spoilage through the product shelf life. Buyers formulating for specific markets should confirm the permitted use level and product category applicable in their destination country before finalising the formulation.

Household and Institutional Cleaning Products

Preserves dishwashing liquids, hard surface cleaners, laundry liquids and institutional cleaning concentrates against microbial spoilage during storage and distribution.

Paints and Coatings

Serves as an in-can preservative for waterborne paints, emulsion paints and coating concentrates, protecting viscosity, odour and film quality and extending shelf life.

Polymer Emulsions and Adhesives

Preserves synthetic emulsions, waterborne resins, adhesives, sealants and construction chemistry products against spoilage during production, storage and transport.

Paper and Pulp

Added to white water, coating colour and pulp stock to control slime and mould growth that cause sheet defects and unplanned machine stops.

Industrial Water Treatment

Used as a non-oxidizing bactericide and algicide in circulating cooling water systems across petrochemical, power generation, metallurgy and central air conditioning plants, controlling biofouling and slime deposition on heat transfer surfaces.

Metalworking Fluids

Controls microbial growth in metal cutting fluids, grinding coolants and rolling emulsions, reducing fluid breakdown and foul odour.

Inks, Dyes and Colour Pastes

Preserves printing inks, printing pastes, dye solutions and pigment preparations against spoilage that would otherwise alter rheology and colour strength.

Other Industrial Applications

Also applied in textile printing and finishing baths, leather processing, photographic film systems, paraffin emulsions, wax dispersions, oilfield injection water and general industrial cleaning operations.

Specifications

Packaging and Shipping

Storage conditions

• Store in a cool, dry and well ventilated warehouse.
• Keep containers tightly closed and protected from direct sunlight.
• Keep the storage temperature below 40 C to maintain active content.
• Keep away from heat sources and avoid prolonged freezing.

Minimum order quantity: 1 metric ton. Lead time: within 3 weeks of order confirmation. Transportation: by sea.

Company Profile

Dideu Group is a professional supplier of fine chemicals and specialty chemicals, serving customers in global markets with a full range of products from lab-scale reagents to industrial quantities. Industrial biocides, preservatives and water treatment chemicals are core lines of our export business, and we support formulators who need batch-to-batch consistency in active content and component ratio. Every shipment is accompanied by a certificate of analysis and the technical documents required for incoming inspection and import clearance. Our sales and technical team handles enquiries, specifications and documentation directly, so buyers deal with one contact from quotation through to delivery. We accept orders from 1 metric ton upward and arrange shipment within 3 weeks of confirmation. Payment is accepted by T/T and L/C.

FAQ

1. What exactly is CAS 55965-84-9?

It is the CMIT/MIT isothiazolinone reaction mass: 5-chloro-2-methyl-2H-isothiazol-3-one and 2-methyl-2H-isothiazol-3-one at a 3:1 ratio, approximately 14 percent active matter, stabilised with magnesium nitrate and magnesium chloride in water. The two actives also carry their own individual CAS numbers, 26172-55-4 and 2682-20-4.

2. Why does the magnesium salt stabiliser matter?

The chlorinated isothiazolinone component decomposes over time in dilute aqueous solution. The magnesium nitrate and magnesium chloride system maintains active content through storage and long-distance transport. When comparing offers from different suppliers, confirm that the stabiliser package is included.

3. What is the minimum order quantity?

The minimum order quantity is 1 metric ton. Standard packaging is 25 kg drums, 200 kg or 250 kg drums and 1000 kg IBC tanks.

4. What is the lead time?

Dideu arranges shipment within 3 weeks of order confirmation. For urgent requirements, please confirm the schedule with our sales team at the quotation stage.

5. What payment terms do you accept?

We accept payment by T/T and L/C.

6. Do you provide COA and technical documents?

Yes. Each batch ships with a certificate of analysis covering active matter content, CMIT to MIT ratio, pH, density and appearance, together with the technical data sheet needed for your incoming inspection and import clearance.

7. How do you ship the goods?

Goods are shipped by sea, packed in drums or IBC tanks loaded into containers. We confirm the loading plan and container quantity with you before dispatch.

8. Can I use this material in a rinse-off personal care product?

This substance is widely used as a preservative in rinse-off personal care formulations. Permitted use levels and product categories differ between markets, so please confirm the requirements applicable in your destination country with your own technical and compliance team before finalising the formulation.