Specialty Additives Available — Bulk Only

Methylisothiazolinone (MIT)

CAS 2682-20-4 · Formula C4H5NOS · MW 115.16 g/mol

A broad-spectrum isothiazolinone preservative that holds back microbial spoilage in water-based systems. It is used as an antimicrobial preservative in paints, latex emulsions, adhesives, metalworking and cutting fluids, paper coatings, and cooling and process water.

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UN Number
UN 2923
Hazard Class
Class 8
HS Code
2934.99
At a Glance
Material Family
Specialty Additives
Record Type
Pure compound
Primary Role
Preservation · Biocidal Action
Functional Roles
METHYLISOTHIAZOLINONE
PRESERVATIVE
Applications & Use Cases
  • Paints and coatings: In-can preservative for latex paints and emulsions
  • Adhesives: Preservative for water-based glues and adhesives
  • Metalworking fluids: Biocide for cutting and metalworking fluids
  • Industrial water: Slime control and preservation in cooling and process water
Physical Properties
Melting Point
50-51 °C
Boiling Point
BP: 93 °C at 0.03 mm Hg
Density
1.35 g/mL at 25 °C
Solubility
Solubility in: acetonitrile 78.6; methanol 79.1; hexane 2.371; xylenol 15.65 (g/100 mL)
Vapor Pressure
0.062 mm Hg at 25 °C
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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DOT / UN Transport Classification
DOT hazard class 8 placard
UN / DOT NumberUN 2923
Hazard Class / DivisionClass 8
Proper Shipping NameCorrosive solids, toxic, n.o.s.

Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.

HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2934 . 99
Chapter 29
Organic chemicals
Heading 29.34
Internationally harmonized (WCO HS)
Subheading 2934.99
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
2682-20-4
Molecular Formula
C4H5NOS
Molecular Weight
115.16 g/mol
IUPAC Name
2-methyl-1,2-thiazol-3-one
INCI Name
METHYLISOTHIAZOLINONE
PubChem CID
InChI Key
BEGLCMHJXHIJLR-UHFFFAOYSA-N
Synonyms & Trade Names
Methylisothiazolinone 2-Methyl-4-isothiazolin-3-one 2-Methyl-3(2H)-isothiazolone 2-Methyl-4-isothiazoline-3-one N-methylisothiazolone 3(2H)-Isothiazolone, 2-methyl- 2-methyl-3-isothiazolone n-methylisothiazolin-3-one Neolone 950 2-methyl-1,2-thiazol-3(2H)-one 2-Methyl-4-isothiazoline-3-ketone methyl-isothiazolinone methylisothiazolidinone
Full Description

Methylisothiazolinone (CAS 2682-20-4) is a nitrogen-sulfur heterocyclic isothiazolinone biocide. It is used as an antimicrobial preservative in paints, latex emulsions, adhesives, metalworking and cutting fluids, paper coatings, and cooling and process water.

Frequently Asked Questions

What products contain methylisothiazolinone?

Methylisothiazolinone (CAS 2682-20-4) is an isothiazolinone biocide used as an antimicrobial preservative in latex paints and emulsions, water-based adhesives, metalworking and cutting fluids, paper coatings, and cooling and process water. RawSource supplies it in bulk for industrial preservation and slime control.

What is methylisothiazolinone used for?

It is an in-can and in-process preservative that controls bacterial and fungal growth in water-based industrial systems – paints, adhesives, metalworking fluids, and cooling water. It is a nitrogen-sulfur heterocyclic isothiazolinone (formula C4H5NOS).

What is the difference between methylisothiazolinone and methylchloroisothiazolinone?

They are related isothiazolinone biocides often used together; methylchloroisothiazolinone (CMIT) carries a chlorine substituent, while methylisothiazolinone (MIT, CAS 2682-20-4) does not. Blends combine the two for broader-spectrum preservation; MIT is also supplied alone. Request technical data from RawSource for the grade you need.

What CAS number and HS code apply to methylisothiazolinone?

CAS 2682-20-4; HS code 2934.99 (heterocyclic compounds, other). The chemical family is Specialty Additives (isothiazolinone biocide).

What bulk packaging and documentation are available?

RawSource supplies methylisothiazolinone in drums, totes, and IBCs for industrial use, with a Certificate of Analysis and Safety Data Sheet per shipment. Request a bulk quote with your target volume and active concentration for current pricing and lead time.

Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.