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Aliphatic HDI-based polyisocyanate offering excellent UV stability and minimal yellowing in clear-coat applications.
Low-viscosity liquid formulation enabling easy handling, precise metering, and compatibility with standard spray and mixing equipment.
Reactive NCO content optimized for balanced pot life and rapid film formation at ambient or low-bake conditions.
Meets stringent VOC regulations with low monomer HDI residue (<0.1 wt%), supporting sustainable coating formulations.
Consistent batch-to-batch quality backed by Covestro’s global manufacturing standards and traceability.
High-gloss automotive clearcoats requiring long-term gloss retention and weather resistance.
Industrial maintenance coatings for metal substrates exposed to outdoor environments.
Wood finishing systems where non-yellowing performance and substrate adhesion are critical.
Plastic coatings for exterior automotive trim and consumer electronics housings.
UV-resistant architectural coatings for façade elements and aluminum composite panels.
| Chemical Type | Aliphatic polyisocyanate (HDI 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 |
| Density at 20°C (g/cm³) | 1.14 – 1.17 |
| Flash Point (PMCC, °C) | 140 – 150 |
| Storage Stability (unopened, 25°C) | ≥12 months |
Q1: What is the primary function of Desmodur BL 3175A in coating and adhesive formulations?
A: Desmodur BL 3175A is a low-viscosity aliphatic isocyanate curing agent designed to react with hydroxyl-functional resins—such as polyesters, acrylics, or polyethers—to form durable, weather-resistant polyurethane networks. It enables ambient- or low-temperature cure profiles while delivering excellent gloss retention and UV stability.
Q2: How does Desmodur BL 3175A differ from aromatic isocyanate curing agents like TDI or MDI derivatives?
A: Unlike aromatic isocyanates, Desmodur BL 3175A is based on aliphatic chemistry, which provides superior resistance to yellowing and long-term color stability under UV exposure. It is particularly suited for high-end decorative and protective coatings where optical clarity and lightfastness are critical.
Q3: What storage conditions are recommended to maintain product stability?
A: Store Desmodur BL 3175A in tightly sealed containers under dry, cool conditions—ideally between 10 °C and 25 °C—and protect from moisture, direct sunlight, and strong oxidizing agents. Prolonged exposure to humidity or elevated temperatures may lead to premature dimerization or viscosity increase.
Q4: Is Desmodur BL 3175A compatible with moisture-cure or one-component polyurethane systems?
A: No—it is formulated specifically for two-component (2K) polyurethane systems requiring separate mixing with OH-functional components. Its reactivity profile is optimized for controlled pot life and film formation in 2K applications, not for ambient moisture-triggered cure mechanisms.
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E-mail: wangxingqiang@ericwchem.com
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