Overview
Isophorone diisocyanate ( CAS 4098-71-9 ), commonly known as IPDI, is an aliphatic cycloaliphatic diisocyanate monomer used to build polyurethane polymers with superior UV and weathering resistance.
Unlike aromatic isocyanates, IPDI-based systems retain color stability over time, making it a preferred building block where appearance and outdoor durability are non-negotiable for manufacturers.
In automotive and industrial coatings, IPDI is reacted with polyols to produce two-component polyurethane topcoats and clearcoats that resist yellowing under prolonged UV exposure during service life.
Aerospace and defense applications rely on IPDI-based polyurethane systems for protective coatings on aircraft exteriors and structural components where long-term performance under harsh environmental conditions is critical.
Adhesive and sealant formulators use IPDI to crosslink moisture-cure or two-part systems bonding plastics, composites, and metals in demanding assemblies. It also serves as a building block for dispersions.
IPDI is supplied as a clear to slightly yellow liquid in standard industrial packaging including drums and IBC containers. It is available in technical and industrial grades for various uses.
Purity specifications are typically at 99%+ for polymer-grade applications. Prepolymer and trimer forms are also commercially available for formulators requiring modified reactivity or reduced vapor pressure.
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Physical Properties
| Melting Point | -60 °C |
| Boiling Point | 158 °C @ Press: 10 Torr |
| Density | 1.056 g/cm³ |
| Flash Point | >230 °F |
| Appearance | colourless or slightly yellow liquid |
| Color | Clear colorless to slightly yellow |
| Form | Liquid |
| Water Solubility | <0.1 g/100 mL at 25 ºC |
| Vapor Pressure | 0.0004 hPa (20 °C) |
| Refractive Index | n 20/D 1.484(lit.) |
| Log P | 4.75 at 25℃ |
Safety & Handling
Danger GHS06 GHS08 GHS09 GHS07 GHS05 Hazard Statements H302 Harmful if swallowed H312 Harmful in contact with skin H314 Causes severe skin burns and eye damage H315 Causes skin irritation H317 May cause an allergic skin reaction H318 Causes serious eye damage H319 Causes serious eye irritation H330 Fatal if inhaled H331 Toxic if inhaled H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled H335 May cause respiratory irritation H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H402 Harmful to aquatic life H411 Toxic to aquatic life with long lasting effects H412 Harmful to aquatic life with long lasting effects Precautionary Statements P233 Keep container tightly closed. 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. 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. P403 Store in a well-ventilated place. 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. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P342+P316 Get emergency medical help immediately. 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+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. 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 | 29291090 |
| UN Number | 2290 |
| ADR Class | 6.1 |
| Packing Group | III |
| Storage Class | 6.1A - Combustible, acute toxic Cat. 1 and 2 very toxic hazardous materials |
| WGK (Germany) | 2 |
Other Names
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Chemical Properties
- CAS Number
- 4098-71-9
- EC Number
- 223-861-6
- Mol. Weight
- 222.28
- HS Code
- 29291090
- Category
- Polymers & Resins