Overview
Hexamethylenediamine ( CAS 124-09-4 ), commercially abbreviated as HMDA, is a primary diamine monomer central to the production of polyamide resins and polymer intermediates. It functions as a difunctional building block and crosslinking agent across polymer chemistry and coatings.
HMDA is the principal monomer in nylon 6,6 production, where it reacts with adipic acid to form the salt precursor used in fiber, film, and engineering plastics. In coatings and adhesives, it acts as a curing agent for epoxy systems.
This chemical improves crosslink density and chemical resistance in industrial finishes. Polyurethane and polyurea formulations use HMDA-derived intermediates to control chain extension and mechanical performance in elastomers and sealants.
Personal care formulators apply it in limited concentrations for pH adjustment in rinse-off products where amine buffering is required. Hexamethylenediamine is supplied as a molten liquid for bulk industrial shipment.
It is also available as a solid flake or crystalline form for smaller-volume packaging. Technical grade is the standard for polymer and coatings applications. Purity specifications typically range from 99%+ for monomer-grade material.
Documentation is available to support compliance in regulated manufacturing environments. This ensures that the material meets the necessary industrial requirements for high-performance polymer synthesis and chemical processing.
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Physical Properties
| Melting Point | 42 °C |
| Boiling Point | 205 °C |
| Density | 0.93 g/cm³ |
| Flash Point | 201 °F |
| Appearance | HMDA is a hygroscopic, colorless solid (pellets or flakes). Weak, fishy odor. |
| Color | White, may discolor during storage |
| Odor | pyridine odor |
| Form | Solution |
| Water Solubility | 490 g/L (20 ºC) |
| Vapor Pressure | 0.25 hPa (20 °C) |
| Refractive Index | n 20/D 1.439(lit.) |
| pH | 12.4 (100g/l, H2O, 25℃) |
| Log P | 0.4 at 25℃ |
Safety & Handling
Danger GHS05 GHS07 GHS08 Hazard Statements H302 Harmful if swallowed H312 Harmful in contact with skin H314 Causes severe skin burns and eye damage H317 May cause an allergic skin reaction H318 Causes serious eye damage H335 May cause respiratory irritation H361 Suspected of damaging fertility or the unborn child H370 Causes damage to organs 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 H402 Harmful to aquatic life H302+H312 Harmful if swallowed or in contact with skin Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. 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. P363 Wash contaminated clothing before reuse. 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. P333+P317 Get emergency medical help. P362+P364 Take off 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 | 29212290 |
| UN Number | 2735 |
| ADR Class | 8 |
| Packing Group | III |
| Storage Class | 8A - Combustible corrosive hazardous materials |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 124-09-4
- EC Number
- 204-679-6
- Mol. Weight
- 116.20
- HS Code
- 29212290
- Category
- Monomers & Building Blocks