Polyurethane Prepolymer (MDI-Based, NCO-Terminated)
MDI-based NCO-terminated polyurethane prepolymer is a versatile building block for one- and two-component polyurethane adhesives, sealants, and elastomers. It reacts with moisture, polyols, or amines to form tough, flexible bonds with excellent dynamic fatigue resistance. The controlled NCO content and low free MDI content make it suitable for demanding structural and elastic bonding applications in automotive, construction, and footwear industries.
Technical Specifications
| moisture | ≤0.05% |
| viscosity | 5,000–50,000 mPa·s (25 °C) |
| NCOcontent | 2.0–15.0% (grade dependent) |
| appearance | Pale yellow to amber viscous liquid |
| freeMDIcontent | ≤0.1% |
Applications
- One-component moisture-curing adhesives and sealants
- Two-component PU structural adhesives
- Automotive glass bonding (direct glazing)
- Flexible packaging and laminating adhesives
- Footwear sole bonding
Key Features
- Broad range of NCO contents for flexible formulation
- Low free MDI content for improved safety profile
- Excellent elongation and dynamic fatigue resistance
- Compatible with polyols, amines, and moisture cure