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Waterborne aliphatic polyisocyanate crosslinker with low VOC and zero APEO content.
Excellent hydrolytic stability and storage life in aqueous dispersions.
Enables fast ambient or low-bake curing for high-gloss, durable coatings.
Delivers superior weather resistance, gloss retention, and chemical resistance.
Compatible with a broad range of acrylic, polyester, and hybrid waterborne resins.
Automotive refinish clearcoats and basecoats.
Industrial maintenance coatings for metal and plastic substrates.
High-performance wood coatings requiring low emission and rapid throughput.
Architectural and decorative coatings for interior/exterior applications.
Coil coating systems where low-temperature cure and film integrity are critical.
| Chemical Type | Aliphatic polyisocyanate (HDI-based) |
| Product Form | Waterborne dispersion |
| Appearance | Clear to slightly hazy, colorless to pale yellow liquid |
| NCO Content (wt %) | 8.5 – 9.5 |
| pH (at 25 °C) | 7.0 – 8.5 |
| Brookfield Viscosity (mPa·s, 25 °C) | 100 – 300 |
| Solids Content (wt %) | 35 – 40 |
| Primary Applications | Two-component waterborne polyurethane coatings |
Q1: What is Bayhydur 305 and how does it differ from solvent-based curing agents?
A: Bayhydur 305 is a waterborne polyisocyanate crosslinker designed for high-performance, low-VOC two-component waterborne coatings. Unlike traditional solvent-based curing agents, it enables formulation of environmentally compliant systems without compromising film hardness, chemical resistance, or drying behavior.
Q2: Which types of resins is Bayhydur 305 typically compatible with?
A: Bayhydur 305 is primarily formulated for use with waterborne acrylic, polyester, and hybrid dispersions. It demonstrates good compatibility and reactivity with hydroxyl-functional aqueous resins, supporting robust crosslinking in ambient- or forced-dry applications.
Q3: How should Bayhydur 305 be stored and handled to maintain stability?
A: Store in original sealed containers at temperatures between 5 °C and 30 °C, away from moisture, direct sunlight, and freezing conditions. Once opened, minimize exposure to ambient humidity and ensure containers are tightly closed after each use to prevent premature reaction or viscosity increase.
Q4: Can Bayhydur 305 be used in food-contact or industrial maintenance coatings?
A: Bayhydur 305 is suitable for industrial maintenance and protective coatings where regulatory compliance is required. For food-contact applications, final formulation must undergo full regulatory evaluation — Covestro does not provide pre-approved food-contact status for this grade, and end-use compliance remains the responsibility of the formulator.
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E-mail: wangxingqiang@ericwchem.com
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