Methylisothiazolinone, 2-Methyl-4-Isothiazolin-3-one

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Methylisothiazolinone is a powerful biocide and preservative within the group of Isothiazolinones. Methylisothiazolinone other names have 2-Methyl-4-Isothiazolin-3-one, MIT, and MI. Methylisothiazolinone products are widely used in cosmetics, shampoos, and body care somethings.

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Chemical Formula:


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Structure Formula:

methylisothiazoline structure formula


Appearance: Clear colorless to light yellow liquid.

Purity: 50%; 20%, 10% or any needed.


Methylisothiazolinone is an antimicrobial used to control slime-forming bacteria, fungi, and algae in cooling water systems, fuel storage tanks, pulp and paper mill water systems, oil extraction systems, and other industrial settings.

2-Methyl-4-Isothiazolin-3-one is frequently used in personal care products. Such as shampoos and other hair care products, as well as certain paint formulations.

And there, methylisothiazolinone is often used in combination with either chloromethylisothiazolinone (known as Kathon CG when paired with methylisothiazolinone) or Benzisothiazolinone (an added antiseptic). Methylisothiazolinone is also used to control the growth of mold, mildew, and sapstain on wood products.

Packing and Storage:

Packed in IBC Tank or 200L Plastic Drum. Keep methylisothiazolinone in a cool place to avoid direct exposure to the sunlight.

Safety and Dangers:

The methylisothiazolinone side effects are mainly caused by the cosmetics containing it. If the methylisothiazolinone in cosmetics meets industry standards and the content does not exceed the standard, then it is safe. This kind of cosmetics will not cause harmful effects on the skin. The methylisothiazolinone toxic is negligible.

It is not recommended to use heavy content cosmetics to avoid certain side effects on the skin. If you use these cosmetics for a long time, methylisothiazolinone allergy may happen.

Therefore, the safety and danger of methylisothiazolinone safety and dangers mainly depend on its content in cosmetics.


Neolone 950, Kathon biocide, Proclin 950.


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