Methimazole
CAS Number
60-56-0
EC Number
200-482-4
Abbreviation
MMI
What is Methimazole?
Methimazole (CAS 60-56-0), also known by the trade name Tapazole and abbreviated as MMI, is an active pharmaceutical ingredient and synthesis intermediate.
Where is Methimazole used?
- Pharmaceutical manufacturing: active substance in antithyroid drug products
- Industrial chemical applications: stabilizing agent
- Textile and leather processing: corrosion inhibitor and stabilizing additive in processing baths where metal ion control is critical
- Paper manufacturing: biocide and preservation agent that extends the service life of process fluids
- Heterocyclic synthesis: building block for chemical production
- Its reactive thione group supports the production of more complex pharmaceutical intermediates.
Other Names (Synonyms)
1-methylimidazole-2(3H)-thione|1-methyl-1,3-dihydro-2H-imidazole-2-thione|Tapazole|1-Methyl-1H-imidazole-2-thiol|1-Methylimidazole-2-thiol|Mercazole|Thiamazol|2H-Imidazole-2-thione, 1,3-dihydro-1-methyl-|MMI
What are the physical properties of Methimazole?
Melting Point 146-148 °C
Boiling Point 280 °C
Density 1.35 g/cm³
Flash Point 280°C
Appearance White Solid
Color White to slightly cream or pale buff
Form Crystalline Powder
Water Solubility soluble
Refractive Index 1.5000 (estimate)
How is Methimazole classified and handled safely? Learn More
Warning
GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H302 H302
H317 H317
H361 H361
Precautionary Statements
P203 P203
P261 P261
P264 P264
P270 P270
Which trade and regulatory codes apply to Methimazole?
HS Code 29332990
Storage Class 11 - Combustible Solids
WGK (Germany) 3