Hexamethylene diisocyanate (HDI)

Description

1. Product Overview
   Hexamethylene diisocyanate (HDI) is a high-performance aliphatic diisocyanate widely used as a key raw material in advanced polyurethane systems. It is primarily utilized in the production of durable coatings, elastomers, adhesives, and sealants requiring superior weather resistance and long-term stability. The product delivers exceptional non-yellowing performance, making it critical for high-end industrial and automotive applications. Its strategic importance lies in enabling premium-grade coating systems that outperform conventional aromatic isocyanates in durability and UV resistance.
2. Key Specifications & Technical Characteristics

• Chemical Name: Hexamethylene diisocyanate (HDI)
• Chemical Formula: C₈H₁₂N₂O₂
• CAS Number: 822-06-0
• Purity: ≥ 99.0% (industrial grade)
• Physical Form: Clear to pale yellow liquid
• Odor: Pungent characteristic isocyanate odor
• Density: ~1.04–1.06 g/cm³ at 20°C
• Boiling Point: ~213°C
• Packaging Options: 200 kg steel drums, ISO tank containers
• Shelf Life: 6–12 months (sealed, dry, cool storage conditions)

3. Core Industrial Applications
   HDI is extensively used in polyurethane production across high-performance industries including automotive, construction, marine, aerospace, and industrial coatings. It is a critical component in automotive OEM and refinish coatings where long-term gloss retention and UV stability are required. In adhesives and sealants, HDI-based systems provide strong bonding performance combined with flexibility and chemical resistance. Compared to aromatic isocyanates such as MDI and TDI, HDI offers superior weatherability and non-yellowing characteristics, making it the preferred choice for premium outdoor and decorative applications.
4. Competitive Advantages

• Excellent UV stability and non-yellowing performance
• Consistent high purity supporting reliable formulation outcomes
• Strong global supply chain ensuring uninterrupted procurement
• Optimized cost-performance balance for industrial-scale production
• Superior durability in harsh environmental conditions
• Full technical documentation and formulation support available
• Compatible with a wide range of polyurethane systems

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): BULK 20 MT
• Loading Capacity: 20–22 MT per 20ft ISO tank/container