Overview
Dimethyldicyane (CAS 6864-37-5 ), commercially known as DMDC, is an aliphatic diamine used as a curing agent and cross-linking component in polymer systems.
Its cycloaliphatic structure delivers cured materials with strong UV stability and optical clarity, properties that determine suitability across coating and adhesive applications.
In epoxy coatings, DMDC produces systems with excellent weathering resistance, making it a preferred curative for exterior architectural and industrial maintenance finishes.
Color and gloss retention are critical in these applications. Adhesive and sealant formulators use it to achieve flexible, durable bonds in structural assemblies.
This is particularly useful where thermal cycling performance is a specification requirement. Polyurea and polyurethane elastomer producers incorporate DMDC to control reaction rates.
It improves the mechanical profile of cast or sprayed elastomeric components. In the construction sector, it is used in flooring systems and protective coatings.
These applications require long pot life and low yellowing under UV exposure. DMDC is supplied as a liquid at ambient conditions and is available in standard packaging formats.
Technical-grade material is the primary commercial offering, with purity specifications typically confirmed by amine value and GC analysis for industrial supply chains.
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Physical Properties
| Melting Point | -7 °C |
| Boiling Point | 342 °C |
| Density | 0.95 g/cm³ |
| Flash Point | >230 °F |
| Color | Colorless to Light yellow to Light orange |
| Form | clear liquid |
| Water Solubility | 2.01g/L at 20℃ |
| Vapor Pressure | 0.08Pa at 20℃ |
| Refractive Index | n 20/D 1.499(lit.) |
| pH | 11 (3.6g/l, H2O, 20℃) |
| Log P | 2.3 at 23℃ |
Safety & Handling
Danger GHS05 GHS06 GHS09 GHS07 GHS08 Hazard Statements H302 Harmful if swallowed H311 Toxic in contact with skin H314 Causes severe skin burns and eye damage H318 Causes serious eye damage H330 Fatal if inhaled H331 Toxic if inhaled H371 May cause 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 H411 Toxic to aquatic life with long lasting effects Precautionary Statements 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. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P320 Specific treatment is urgent (see … on this label). P321 Specific treatment (see … on this label). P330 Rinse mouth. P363 Wash contaminated clothing before reuse. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. 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. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P301+P330+P331 Rinse mouth. Do NOT induce vomiting. P302+P361+P354 IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29213000 |
| UN Number | 2927 |
| ADR Class | 6.1 |
| Packing Group | II |
| 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
- 6864-37-5
- EC Number
- 229-962-1
- Mol. Weight
- 238.41
- HS Code
- 29213000
- Category
- Amines