Overview
N,N,4-Trimethylbenzenamine (CAS 99-97-8 ), commercially known as N,N-Dimethyl-p-toluidine or DMPT, is a tertiary aromatic amine used primarily as a chemical accelerator and curing agent across polymer and coating systems.
It activates peroxide-based initiators at ambient temperatures, enabling room-temperature cure without external heat input. In acrylic and methacrylate adhesive systems, DMPT accelerates the free-radical polymerization.
Initiated by benzoyl peroxide, it is a standard component in two-part structural adhesives and dental materials. Printing ink formulators use it to promote rapid cure in UV and peroxide-cured ink systems.
This is essential where press-speed and substrate adhesion are critical. In fiber-reinforced polymer composites and casting resins, it enables cold-cure processing for parts where elevated-temperature post-curing is impractical.
DMPT also functions as an intermediate in synthesizing dyes and pigments, particularly azo-type colorants used in plastics and packaging materials. It is supplied as a clear to pale yellow liquid in standard drums.
Technical grade is the predominant commercial specification, with purity levels typically at 98–99%+ by GC. Bulk availability supports both industrial compounders and smaller specialty formulators.
This ensures consistent amine activity across batches for various industrial applications. The product meets rigorous industrial requirements for stability and performance in diverse chemical manufacturing environments.
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Physical Properties
| 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℃ |
Safety & Handling
Danger GHS06 GHS08 GHS09 GHS07 Hazard Statements H227 Combustible liquid H301 Toxic if swallowed H302 Harmful if swallowed H311 Toxic in contact with skin H317 May cause an allergic skin reaction H331 Toxic if inhaled H332 Harmful if inhaled H336 May cause drowsiness or dizziness H350 May cause cancer H351 Suspected of causing cancer H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure H401 Toxic to aquatic life H402 Harmful to aquatic life H410 Very toxic to aquatic life with long lasting effects H411 Toxic to aquatic life with long lasting effects H412 Harmful to aquatic life with long lasting effects H301+H311+H331 Toxic if swallowed, in contact with skin or if inhaled 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. P262 Do not get in eyes, on skin, or on clothing. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P403 Store in a well-ventilated place. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P301+P316 Get emergency medical help immediately. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P333+P317 Get emergency medical help. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P403+P233 Store in a well-ventilated place. Keep container tightly closed.
Trade & Regulatory
| HS Code | 29214300 |
| Storage Class | 6.1A - Combustible acute toxic Cat. 1 and 2 very toxic hazardous materials |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 99-97-8
- EC Number
- 202-805-4
- Mol. Weight
- 135.21
- HS Code
- 29214300
- Category
- Flavors & Fragrances