Amines
REACH
N,N,4-Trimethylbenzenamine
CAS Number
99-97-8
EC Number
202-805-4
Abbreviation
DMPT
What is N,N,4-Trimethylbenzenamine?
N,N,4-Trimethylbenzenamine (CAS 99-97-8), also known as N,N-Dimethyl-p-toluidine or DMPT, is a tertiary aromatic amine used as a chemical accelerator and curing agent in polymer and coating systems.
Where is N,N,4-Trimethylbenzenamine used?
- Adhesives: accelerates free-radical polymerization in acrylic and methacrylate systems
- Structural adhesives and dental materials: standard component with benzoyl peroxide initiation
- Printing inks: promotes rapid cure in UV and peroxide-cured systems
- Composites and casting resins: enables cold-cure processing
- Dyes and pigments: intermediate for azo-type colorants in plastics and packaging
- It activates peroxide-based initiators at ambient temperatures, enabling room-temperature cure without external heat.
Commercial specifications
- Technical grade, purity typically 98–99%+ by GC
- Clear to pale yellow liquid in standard drums
- Bulk availability for industrial compounders and specialty formulators
Other Names (Synonyms)
N,N-Dimethyl-p-toluidine|N,N,4-trimethylaniline|Dimethyl-p-toluidine|DMPT
What are the physical properties of N,N,4-Trimethylbenzenamine?
Melting Point 203 °C
Boiling Point 215 °C
Density 0.9 g/cm³
Flash Point 182 °F
Appearance light yellow liquid
Color Clear yellow
Form Liquid
Water Solubility Miscible with alcohol, ether and chloroform. Immiscible with water.
Vapor Pressure 0.1 hPa (20 °C)
Refractive Index n 20/D 1.546(lit.)
Log P 1.729-2.81 at 35℃
How is N,N,4-Trimethylbenzenamine classified and handled safely? Learn More
Danger
GHS06· Toxic GHS08· Health Hazard GHS09· Environmental Hazard GHS07· Irritant
Hazard Statements
H227 Combustible liquid
H301 Toxic if swallowed
H302 Harmful if swallowed
H311 Toxic in contact with skin
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
Which trade and regulatory codes apply to N,N,4-Trimethylbenzenamine?
HS Code 29214300
Storage Class 6.1A - Combustible acute toxic Cat. 1 and 2
very toxic hazardous materials
WGK (Germany) 3