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Send EmailMethylene Diphenyl Diisocyanate, Monomeric MDI, Polymeric MDI, Modified MDI, 101-68-8, 2536-05-2, 26447-40-5
MDI is an aromatic diisocyanate compound. Main types include:
Monomeric MDI (4,4’-MDI): Pure, low functionality (f=2), solid at room temperature.
Polymeric MDI (PMDI): Oligomer mixture (f=2.3–3.0), higher viscosity, liquid at room temperature.
Modified MDI: Carbodiimide, uretdione, or urethane-modified forms with lower freezing points.
| Parameter | Monomeric MDI | Polymeric MDI |
|---|---|---|
| Appearance (25°C) | White to pale yellow solid / molten liquid | Brownish-yellow liquid |
| Freezing point | ~38–40°C | <0°C (typically liquid) |
| Viscosity (25°C) | ~5–15 mPa·s (molten) | 150–300 mPa·s |
| Isocyanate content (%NCO) | ~33.6 | 30–32% |
| Density (25°C) | ~1.19 g/cm³ | ~1.22 g/cm³ |
| Flash point (closed cup) | >200°C | >200°C |
| Solubility | Soluble in toluene, acetone, DMF; reacts with water | Soluble in toluene, acetone, DMF |
Reactivity: Reacts vigorously with water, releasing CO₂ gas and forming polyurea. Exothermic reaction with bases, alcohols, and amines.
Flexible polyurethane foams (PMDI)
Rigid polyurethane foams (insulation panels, sandwich panels)
Elastomers (wheels, rollers, industrial parts)
Adhesives, coatings, sealants
Polymeric binders (wood composites, flooring)
Storage temperature:
Monomeric MDI: Keep at 40–50°C (molten) or solid under inert gas.
Polymeric MDI: 10–35°C.
Moisture protection: Store under dry inert gas (N₂); avoid exposure to humid air.
Containers: Tightly sealed, stainless steel or suitable polyethylene containers.
Shelf life: 6–12 months in original, unopened containers stored in a cool, dry place.
Inhalation: Do not breathe vapors or aerosols. May cause asthma-like symptoms and respiratory sensitization.
Skin contact: Irritant; may cause allergic contact dermatitis in sensitive individuals.
Eye contact: Severe irritation; rinse immediately with plenty of water.
Chronic: Repeated exposure may lead to lung sensitization.
Personal Protective Equipment (PPE):
Nitrile gloves, chemical splash goggles, adequate ventilation, and an N95 or isocyanate-certified respirator if needed.
Classification (EU/CLP): H334 (May cause allergy or asthma symptoms or breathing difficulties if inhaled), H317 (May cause an allergic skin reaction).
Inhalation: Remove to fresh air. Seek medical attention if breathing difficulties occur.
Skin: Remove contaminated clothing. Wash thoroughly with soap and water.
Eye: Rinse with plenty of water for at least 15 minutes. Consult a physician.
Ingestion: Do not induce vomiting. Seek medical advice immediately.
The information provided in this document is based on our current knowledge and is for informational purposes only. Users should verify suitability for their specific applications and comply with all local regulations. The manufacturer assumes no liability for damages resulting from improper use or handling.