Methylchloroisothiazolinone/Methylisothiazolinone
CAS 55965-84-9
EC 611-341-5
Formula C4H5NOS.C4H4ClNOS
MW 264.756 g/mol
Heterocyclic Compounds Water TreatmentPulp & PaperCoatings, Adhesives, Sealants & ElastomersPersonal Care & CosmeticsOil, Gas & EnergyLubricants & Metalworking Preservation & Biocide
Description
Methylchloroisothiazolinone/Methylisothiazolinone (MCI/MI), sold under trade names including Kathon CG, Kathon WT, Con WT, and KKM 43, is a blended isothiazolinone biocide registered under CAS 55965-84-9 and EC 611-341-5. It carries no E-code designation and is classified within the heterocyclic compounds category.
In water treatment and industrial cooling systems, MCI/MI controls bacterial and fungal growth by disrupting cellular thiol groups, preventing biofilm formation at low active concentrations. In rinse-off personal care formulations and coatings, it functions as a preservation system, inhibiting microbial contamination throughout product shelf life.
This biocide is supplied as a liquid and is subject to REACH registration requirements within the EU, with usage governed by Biocidal Products Regulation (BPR) product-type authorisations. Concentration limits apply in cosmetic applications under EC Regulation 1223/2009. Procurement teams should confirm grade specification and regional authorisation status prior to ordering.
In water treatment and industrial cooling systems, MCI/MI controls bacterial and fungal growth by disrupting cellular thiol groups, preventing biofilm formation at low active concentrations. In rinse-off personal care formulations and coatings, it functions as a preservation system, inhibiting microbial contamination throughout product shelf life.
This biocide is supplied as a liquid and is subject to REACH registration requirements within the EU, with usage governed by Biocidal Products Regulation (BPR) product-type authorisations. Concentration limits apply in cosmetic applications under EC Regulation 1223/2009. Procurement teams should confirm grade specification and regional authorisation status prior to ordering.
Physical Properties
| Boiling Point | 100.1°C at 101.325kPa |
| Density | d20 1.19 |
| Color | Colorless to light yellow |
| Form | Liquid |
| Vapor Pressure | 0.003-17Pa at 20-45℃ |
| pH | 3.43 at 20℃ and 10g/L |
| Log P | -0.34-0.81 at 10-30℃ and pH5-9 |
Safety & Handling (Learn More)
Danger GHS05 GHS06 GHS09 GHS07
H
H301H302H310H311H312H314H317H318H330H331H332H400H410H411
P
P260P261P262P264P270P271P272P273P280P284P316P317P320P321P330P363P391P405P501P264+P265P301+P316P301+P317P302+P352P304+P340P333+P317P361+P364P362+P364P403+P233P301+P330+P331P302+P361+P354P305+P354+P338
Other Names
Kathon WTKKM 43Con WTKathonCMIT/MITKathon CGBio-PergeKathon LX
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Raw Materials
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