1. Basic Identification Information

Parameter	English Specification/Value
IUPAC Name	2-Methyl-1,2-thiazol-3(2H)-one
Common Name(s)	2-Methyl-2,3-dihydro-1,2-thiazol-3-one; Methylisothiazolinone; MIT; MI
CAS Registry Number	2682-20-4
EC/EINECS Number	220-239-6
Molecular Formula	C₄H₅NOS
Molecular Weight	115.15 g/mol
Chemical Class	Isothiazolinone-based bactericidal preservative

2. Physicochemical Properties

Property Category	Specific Parameter	Specification/Value
Structural Features	Core Functional Groups	2,3-dihydro-1,2-thiazole ring; ketone group (C=O) at C3; methyl substituent at N2
Physical Appearance	State & Color	White to pale yellow crystalline powder
	Melting Point	254–256 °C
	Density (25 °C)	1.35 g/cm³