Hexamethylene diisocyanate (HDI)

Description

1. Product Overview
Hexamethylene diisocyanate (HDI) is a high-purity aliphatic diisocyanate monomer used as the fundamental building block for advanced polyurethane coatings, adhesives, and elastomers. Its primary industrial use lies in formulating light-stable, high-durability protective coatings for automotive, aerospace, and industrial flooring sectors. The key value proposition is its exceptional resistance to UV degradation, chemicals, and abrasion—enabling coatings that maintain color and structural integrity for decades. Strategically, HDI is critical as global demand shifts toward high-performance, low-VOC, and weather-resistant materials in regulatory-driven markets.

2. Key Specifications & Technical Characteristics

• Chemical composition: Hexamethylene diisocyanate (CAS 822-06-0), aliphatic diisocyanate monomer, NCO content approx. 49.9%

• Purity level: ≥ 99.5% (typical industrial grade); hydrolyzable chlorine < 100 ppm

• Physical characteristics: Clear, colorless to pale yellow liquid; low viscosity (2.5–4.5 mPa·s at 25°C); density approx. 1.05 g/cm³ at 25°C

• Packaging options: Sealed 200 kg steel drums, 1,000 kg IBC totes, ISO tank containers (20 MT)

• Shelf life: 12 months from date of manufacture when stored in original unopened containers under dry nitrogen atmosphere, at 15–35°C, away from moisture and direct heat

3. Core Industrial Applications

• Primary industries: Automotive OEM & refinish coatings, aerospace protective layers, marine coatings, industrial wood finishes, adhesives, and elastomer manufacturing.

• Operational use cases: Clear coats for vehicle exteriors (UV-resistant), anti-graffiti coatings for public infrastructure, corrosion-resistant primers for offshore equipment, and flexible laminating adhesives for food packaging.

• Performance advantage vs. alternatives: Unlike aromatic isocyanates (e.g., MDI, TDI), HDI-based coatings do not yellow under sunlight—critical for exterior finishes. Compared to other aliphatic diisocyanates (IPDI), HDI offers lower viscosity (easier mixing) and faster drying times without sacrificing hardness, reducing cycle times in production lines by up to 30%.

• Cost efficiency: Higher solids formulations using HDI allow thinner coatings with equivalent protection, lowering per-square-meter material cost despite higher upfront monomer price.

4. Competitive Advantages

• Quality consistency: Batch-to-batch NCO content variance < 0.3%; ISO 9001:2025 certified production with real-time FTIR monitoring.

• Supply reliability: Dual-sourced manufacturing (Asia-Pacific and Europe) with 6,000 MT safety stock buffer; average lead time 14 days for bulk orders.

• Logistics capability: Specialized temperature-controlled supply chain; hazardous-class 6.1 shipping with UN 2281 certification.

• Pricing competitiveness: Long-term contract pricing with monthly index-based adjustments (tracking benzene, chlorine, and energy costs); volume rebates ≥ 500 MT/year.

• Sustainability: 100% solvent-free packaging options; low-monomer residual grade (< 0.1% free HDI) available to reduce workplace exposure; byproduct recycling program available for buyers with return logistics.

• Technical support: Dedicated application engineering team; full Safety Data Sheets (SDS), REACH and TSCA compliance documentation; free lab-scale sample qualification.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): 16 MT (80 drums or 16 IBCs) for standard grade

• BULK 20MT loading capacity: One ISO tank container (20 MT net weight) – optimized for direct inline feed to polyurethane production reactors