HDI Trimer | Poly(Hexamethylene Diisocyanate) | CAS 28182-81-2 | PU Coatings Hardener | China Manufacturer
Product Name: Poly(Hexamethylene Diisocyanate) (HDI Trimer)
Synonym: HDI trimer, Polyisocyanate HDI, HDI isocyanurate, PU hardener
CAS Number: 28182-81-2
Molecular Formula: C₈H₁₂N₂O₂
Molecular Weight: 168.2 g/mol
NCO Content: 21.8 ± 0.3 %
Viscosity (25°C): 2500 ± 750 mPa·s
Color Value (Hazen): ≤ 40
Monomeric HDI: ≤ 0.20 %
Equivalent Weight: approx. 193
Density (25°C): approx. 1.16 g/mL
Flash Point: approx. 158 °C
Appearance: Colorless to slightly yellowish clear liquid
Packaging: 20kg / 220kg metal drum (custom packaging available)
Lead Time: 3-7 business days from stock
Applications: Automotive OEM coatings, refinishing, industrial finishing, plastics coatings, transportation
Free Sample: Available upon request for R&D evaluation
Worldwide Delivery: DHL / FedEx / air / sea
Made in China | COA & SDS provided with every shipment
- Worldwide Delivery
- Quality Assurance
- 24/7 Customer Service
Product Introduction
📄 Product Overview
Poly(Hexamethylene Diisocyanate) (CAS 28182-81-2), also known as HDI trimer or HDI isocyanurate, is a solvent-free aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI). It appears as a colorless to slightly yellowish clear liquid and serves as a high-performance hardener for lightfast two-component polyurethane coatings.
As a China-based direct manufacturer, Alfa Chemical supplies HDI trimer with strictly controlled NCO content (21.8±0.3%), low viscosity, and consistent quality to meet the demanding requirements of automotive, industrial, and transportation coatings. We provide flexible packaging options (20kg to 220kg metal drums) and fast worldwide delivery.
📋 Product Specifications
| ITEMS | SPECIFICATION |
|---|---|
| CAS Number | 28182-81-2 |
| Molecular Formula | C₈H₁₂N₂O₂ |
| Molecular Weight | 168.2 g/mol |
| Appearance | Colorless to slightly yellowish clear liquid |
| NCO Content | 21.8 ± 0.3 % |
| Viscosity (25°C) | 2500 ± 750 mPa·s |
| Color Value (Hazen) | ≤ 40 |
| Monomeric HDI | ≤ 0.20 % |
| Equivalent Weight | approx. 193 |
| Density (25°C) | approx. 1.16 g/mL |
| Flash Point | approx. 158 °C |
| Storage Condition | -20 to 40°C, moisture-proof |
| Shelf Life | 12 months (sealed, dry) |
| Packaging Options | 20kg / 220kg metal drums, custom |
⚠️ Moisture Sensitive: Protect from moisture, heat and foreign material. Store in original container. Recommended storage temperature: -20 to 40°C.
🏗️ Key Applications
HDI trimer is a high-performance hardener for lightfast two-component polyurethane coatings with excellent chemical and weathering resistance, gloss retention, and mechanical properties. Key applications include:
Automotive OEM & Refinish
High-performance clearcoats and topcoats with superior gloss and weatherability.
Industrial & Transportation Coatings
Durable coatings for heavy machinery, transportation equipment, and infrastructure.
Plastics & Specialty Coatings
Excellent adhesion and flexibility for coatings on plastics and specialty substrates.
High-Performance Industrial Finishes
Chemical and scratch-resistant finishes for demanding industrial environments.
🔬 Quality Control & Supply Capacity
🏭 Production Capacity
Annual output of 1,000+ metric tons. Advanced trimerization process ensures low monomer content (≤0.20%), consistent NCO content, and reliable viscosity across all batches.
📋 Batch Traceability
Every shipment includes a Certificate of Analysis (COA) showing NCO content, viscosity, color, and monomer content. SDS and TDS are available upon request.
❓ Frequently Asked Questions
Our HDI trimer has an NCO content of 21.8 ± 0.3%, providing consistent reactivity for high-performance PU coatings.
Our product has a low monomeric HDI content of ≤0.20%, ensuring safe handling and compliance with regulatory standards.
Available in 20kg and 220kg metal drums. Custom packaging available upon request.
Store in original sealed containers at -20 to 40°C. Protect from moisture, heat, and foreign material. Shelf life is 12 months under proper storage.
📦 Packaging & Shipping
Packaging
20kg / 220kg metal drums
Custom packaging available
Lead Time
3-7 business days from stock
Bulk orders negotiable
Shipping
DHL / FedEx (samples)
Air / Sea freight (bulk)
📄 Documentation: COA and SDS provided with every shipment.
🏭 Why Choose Alfa Chemical
1,000+ Tons Capacity
Stable supply for automotive and industrial coatings industries
Batch-to-Batch Consistency
Strictly controlled NCO content, viscosity, and monomer content
China Manufacturer Direct
Competitive pricing with full COA/SDS traceability
📂 Product Category
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🔗 Related Isocyanate Products
- HDI Trimer (CAS 28182-81-2) - Aliphatic polyisocyanate hardener
- HDI (CAS 822-06-0) - Hexamethylene Diisocyanate monomer
- PAPI (CAS 9016-87-9) - Polymeric MDI
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