1. Product Introduction & Main Application
Arnico’s Methylene Diphenyl Diisocyanate (MDI) is an aromatic compound with two highly reactive isocyanate groups, supplied as a light brown liquid. This substance is the primary and irreplaceable isocyanate component in the production of rigid polyurethane foams for building and refrigerator insulation, high-resistance elastomers, engineering adhesives, and industrial coatings with exceptional abrasion and chemical resistance.
2. Technical Specifications
| Technical Parameter | Polymeric MDI (PMDI) | Pure Monomeric MDI (4,4′-MDI) | Unit |
|---|---|---|---|
| NCO Content (Isocyanate Content) | 30.5 – 32.0 | 33.4 – 33.6 | % |
| Viscosity (25°C) | 150 – 250 | 4 – 6 (molten solid at 43°C) | mPa.s |
| 4,4′-MDI Isomer | 40 – 55 | ≥ 99.5 | % |
| Acidity (as HCl) | ≤ 100 | ≤ 30 | ppm |
| Density (25°C) | 1.22 – 1.24 | 1.18 – 1.19 (molten) | g/cm³ |
| Color (APHA) | Dark brown (N/A) | ≤ 30 (molten) | Pt-Co |
3. Features & Benefits
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Fast & Complete Reactivity (PMDI): Creates a rigid, closed-cell foam with the highest thermal insulation performance (the lowest Lambda value) in the industry.
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Unmatched Adhesion & Strength: Powerful chemical bonding to wood, metal, and concrete surfaces, making it an ideal binder for OSB boards.
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Exceptional Monomeric Purity (Pure MDI): Enables the production of thermoplastic polyurethanes (TPU) and cast elastomers with high clarity and precise mechanical properties.
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Thermal & Chemical Resistance: Stability against oils, solvents, and high temperatures.
4. Industrial Applications
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Insulation: Rigid polyurethane foam (PUR/PIR) for refrigerators, cold storage, and building sandwich panels.
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Wood Industry: A formaldehyde-free binder for OSB and MDF wood panels.
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Automotive Industry: Dashboards, steering wheels, and interior and exterior parts (RIM).
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Coatings & Elastomers: Industrial flooring, printing rollers, and skate wheels.
5. Safety & Handling
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MSDS (Material Safety Data Sheet): This is a severe respiratory and skin irritant and a sensitizer (occupational asthma). The Arnico MSDS is vital for safe handling.
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Storage Conditions: Store in dry tanks under a nitrogen blanket, at a temperature of 25-30°C (PMDI) and 43-45°C (Pure MDI), and away from moisture and alkalis.
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Personal Protective Equipment (PPE): A full-face respirator with an A2P3 filter, solvent-resistant clothing, and Viton gloves are mandatory.
6. Quality Assurance & COA
Arnico MDI shipments are accompanied by a Certificate of Analysis (COA) detailing the NCO content, viscosity, and isomer purity.
