Date published: 2026-8-19

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5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0) (CAS 26172-55-4)

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Alternate Names:
5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0) is also known as Methylchloroisothiazolinone.
Application:
5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0) is an isothiazolinone and preservative agent with antimicrobial and antifungal properties.
CAS Number:
26172-55-4
Purity:
Active Ingredient >14%
Molecular Weight:
149.60
Molecular Formula:
C4H4ClNOS
Supplemental Information:
This is classified as a Dangerous Good for transport and may be subject to additional shipping charges.
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0) is an isothiazolinone. The active sulphur moiety of 5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0) is able to oxidize thiol-containing residues, effectively killing most aerobic and anaerobic bacteria. In addition to its antimicrobial properties, it has antifungal properties as well, and is found in many water-based personal care products. 5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0) may be used in conjunction with other preservatives such as ethylparaben or benzalkonium chloride. It may also be used in the production of glue, detergents, paints, and fuels.


5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0) (CAS 26172-55-4) References

  1. Preservation of products with MCI/MI in Switzerland.  |  Reinhard, E., et al. 2001. Contact Dermatitis. 45: 257-64. PMID: 11722483
  2. In vitro induction of apoptosis vs. necrosis by widely used preservatives: 2-phenoxyethanol, a mixture of isothiazolinones, imidazolidinyl urea and 1,2-pentanediol.  |  Anselmi, C., et al. 2002. Biochem Pharmacol. 63: 437-53. PMID: 11853695
  3. Involvement of oxidative stress in apoptosis induced by a mixture of isothiazolinones in normal human keratinocytes.  |  Ettorre, A., et al. 2003. J Invest Dermatol. 121: 328-36. PMID: 12880425
  4. GSH depletion, protein S-glutathionylation and mitochondrial transmembrane potential hyperpolarization are early events in initiation of cell death induced by a mixture of isothiazolinones in HL60 cells.  |  Di Stefano, A., et al. 2006. Biochim Biophys Acta. 1763: 214-25. PMID: 16458373
  5. Iron dependent degradation of an isothiazolone biocide (5-chloro-2-methyl-4-isothiazolin-3-one).  |  Tanji, Y., et al. 2007. Biofouling. 23: 73-7. PMID: 17453731
  6. Role of intracellular calcium and S-glutathionylation in cell death induced by a mixture of isothiazolinones in HL60 cells.  |  Frosali, S., et al. 2009. Biochim Biophys Acta. 1793: 572-83. PMID: 19118583
  7. Growth inhibitory and biocidal activity of some isothiazolone biocides.  |  Collier, PJ., et al. 1990. J Appl Bacteriol. 69: 569-77. PMID: 2292520
  8. [Kathon CG--a new contact sensitizing preservative].  |  Knudsen, BB. and Menné, T. 1990. Ugeskr Laeger. 152: 656-7. PMID: 2321281
  9. Analysis of isothiazolinone preservatives in polyvinyl alcohol cooling towels used in Japan.  |  Kawakami, T., et al. 2014. J Environ Sci Health A Tox Hazard Subst Environ Eng. 49: 1209-17. PMID: 24967553
  10. Photoaggravated contact dermatitis to Kathon CG (methylchloroisothiazolinone/methylisothiazolinone): a novel pattern of involvement in a growing epidemic?  |  Pirmez, R., et al. 2015. Br J Dermatol. 173: 1343-4. PMID: 26130214
  11. The fate of two isothiazolinone biocides, 5-chloro-2-methylisothiazol-3(2H)-one (CMI) and 2-methylisothiazol-3(2H)-one (MI), in liquid air fresheners and assessment of inhalation exposure.  |  Park, SK. and Kwon, JH. 2016. Chemosphere. 144: 2270-6. PMID: 26598996
  12. Development and validation of an analytical method for determination of bronopol and kathon preservative in milk.  |  Chilbule, A., et al. 2019. J Food Sci Technol. 56: 3170-3176. PMID: 31205373
  13. Graphene oxide enhanced ozonation of 5-chloro-2-methyl-4-isothiazolin-3-one: Kinetics, degradation pathway, and toxicity.  |  Ye, B., et al. 2020. J Hazard Mater. 394: 122563. PMID: 32248031
  14. Kathon CG: a review.  |  de Groot, AC. and Weyland, JW. 1988. J Am Acad Dermatol. 18: 350-8. PMID: 3279090
  15. Occurrence and Transport of Isothiazolinone-Type Biocides from Commercial Products to Aquatic Environment and Environmental Risk Assessment.  |  Paun, I., et al. 2022. Int J Environ Res Public Health. 19: PMID: 35805435

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0), 5 g

sc-352647
5 g
$94.00

5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0), 25 g

sc-352647A
25 g
$206.00

5-Chloro-2-methyl-4-isothiazolin-3-one (CMI/MI > 2.0), 100 g

sc-352647B
100 g
$501.00