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Highly reactive liquid 4,4'-diphenylmethane diisocyanate (MDI) with low viscosity for excellent processability in mixing and dispensing systems.
Consistent monomeric MDI content ensures reliable reactivity and predictable cure kinetics in polyurethane formulations.
Low volatility and reduced vapor pressure compared to pure monomeric MDI, enhancing workplace safety and handling stability.
Optimized for ambient- and elevated-temperature curing, enabling flexibility in production line design and cycle time reduction.
Compatible with a broad range of polyols—including polyester, polyether, and polycarbonate types—supporting formulation versatility.
Reaction injection molding (RIM) and structural RIM (SRIM) for automotive interior and exterior components.
Cast elastomer systems used in industrial rollers, mining screens, and high-wear mechanical parts.
Flexible and semi-rigid polyurethane foams for seating, bedding, and acoustic insulation applications.
Adhesives and sealants requiring fast green strength development and excellent substrate bonding.
Coating systems for protective and decorative finishes on metal, wood, and composite substrates.
| Chemical Type | 4,4'-Diphenylmethane diisocyanate (MDI), monomeric-rich liquid |
| Product Form | Liquid |
| Appearance | Clear, pale yellow to amber liquid |
| Primary Applications | RIM, cast elastomers, adhesives, coatings, flexible & semi-rigid foams |
| Key Features | Low viscosity, controlled reactivity, low volatility, consistent monomer content |
| Storage Stability | Stable under dry, inert conditions at 15–25 °C; protect from moisture and UV light |
| Isocyanate Content (NCO %) | Approx. 33.5 wt% (typical) |
| Density (20 °C) | Approx. 1.21–1.23 g/cm³ |
Q1: What is the primary function of Lupranate MM103C in polyurethane systems?
A: Lupranate MM103C is a liquid MDI-based curing agent designed to react with polyols and other active hydrogen-containing components to form crosslinked polyurethane networks. It enables controlled reactivity, good pot life, and contributes to final film hardness, chemical resistance, and mechanical integrity in thermoset coatings and adhesives.
Q2: How does Lupranate MM103C differ from conventional solid MDI or polymeric MDI?
A: Unlike crystalline MDI or high-viscosity polymeric MDI, Lupranate MM103C is a homogeneous liquid at room temperature, offering improved handling, easier metering, and enhanced compatibility with a broad range of resins and solvents. Its modified structure provides balanced reactivity—lower than pure monomeric MDI but higher than many polymeric variants—making it suitable for ambient- or low-bake cure applications.
Q3: Is Lupranate MM103C compatible with common polyol types used in industrial coatings?
A: Yes—it demonstrates good miscibility and reactivity with polyester polyols, acrylic polyols, and certain polyether polyols typically employed in high-performance two-component polyurethane coatings. Compatibility and optimal stoichiometry should be verified experimentally within the specific formulation matrix due to variations in hydroxyl number, functionality, and steric hindrance.
Q4: What storage and handling precautions are recommended?
A: Store in tightly sealed containers under dry, inert conditions (e.g., nitrogen blanket) at temperatures between 15–30 °C. Avoid prolonged exposure to moisture, as Lupranate MM103C is moisture-sensitive and may form insoluble urea precipitates upon contact with humidity or water. Use appropriate PPE—including nitrile gloves and eye protection—and ensure adequate ventilation during handling.
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