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High-reactivity aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry.
Excellent weather resistance and UV stability, enabling long-term gloss and color retention in outdoor applications.
Low viscosity and good compatibility with common hydroxyl-functional acrylics, polyesters, and polycarbonates.
Non-yellowing performance ideal for clearcoats and light-colored topcoats requiring optical clarity.
Compliant with major global VOC regulations, supporting sustainable coating formulation strategies.
Automotive OEM clearcoats and basecoats requiring high durability and gloss.
Industrial maintenance coatings for machinery, rail vehicles, and agricultural equipment.
Architectural façade and cladding coatings exposed to harsh environmental conditions.
High-performance plastic coatings for exterior automotive trim and consumer electronics housings.
Wood coatings for premium furniture and interior architectural millwork demanding clarity and hardness.
| Chemical Type | Aliphatic HDI-based polyisocyanate (trimer) |
| Product Form | Liquid |
| Appearance | Clear, colorless to pale yellow liquid |
| NCO Content (wt %) | 15.5 – 16.5 |
| Viscosity at 25 °C (mPa·s) | 800 – 1,200 |
| Specific Gravity (20 °C) | 1.17 – 1.21 |
| Solvent | Acetate-based (e.g., butyl acetate) |
| Storage Stability | ≥12 months at <25 °C in sealed original container |
Q1: What is the primary chemical nature of Desmodur HL BA?
A: Desmodur HL BA is a low-viscosity, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), modified with biobased components to enhance sustainability while maintaining performance in two-component polyurethane systems.
Q2: How does Desmodur HL BA differ from conventional HDI-based curing agents?
A: Unlike standard HDI trimer or biuret curing agents, Desmodur HL BA features a tailored molecular architecture that delivers improved compatibility with hydroxyl-functional resins, reduced VOC potential, and enhanced storage stability—particularly in waterborne and high-solids formulations.
Q3: What types of coatings benefit most from using Desmodur HL BA?
A: It is especially suited for high-performance industrial and automotive refinish coatings where excellent gloss retention, UV resistance, and mechanical durability are required—commonly used in clearcoats, topcoats, and protective finishes for metal and plastic substrates.
Q4: Is Desmodur HL BA compatible with moisture-cure or one-component systems?
A: No—it is designed exclusively for two-component (2K) polyurethane systems requiring a separate hydroxyl-functional component. It is not formulated for ambient moisture cure or single-component applications.
Q5: How should Desmodur HL BA be stored and handled to maintain optimal performance?
A: Store in tightly sealed containers under dry, cool conditions (typically below 30 °C) and protect from moisture, heat, and direct sunlight. Always follow Covestro’s safety data sheet for handling precautions, including appropriate PPE and ventilation during processing.
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E-mail: wangxingqiang@ericwchem.com
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