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Aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry.
Low-viscosity liquid offering excellent compatibility with common polyol resins and ease of handling.
Provides outstanding UV stability and long-term gloss retention in coated surfaces.
Designed for ambient or low-bake curing systems, enabling energy-efficient processing.
Meets stringent VOC regulations with low monomer content and high functionality.
High-performance automotive clearcoats and basecoats.
Premium industrial maintenance coatings for metal and plastic substrates.
Architectural and façade coatings requiring weather resistance and color stability.
Wood finishing systems demanding hardness, chemical resistance, and clarity.
Plastic coatings for exterior automotive components and consumer electronics.
| Chemical Type | Aliphatic HDI-based polyisocyanate (trimer) |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt %) | 17.0 – 17.8% |
| Viscosity (25 °C, mPa·s) | 1,000 – 2,000 |
| Functionality (avg.) | ~3.4 |
| Storage Stability | Stable at 20–25 °C for ≥12 months in sealed containers |
| Primary Applications | Two-component polyurethane coatings (2K PU) |
Q1: What is the primary function of B1358A in coating and adhesive formulations?
A: B1358A is a blocked aliphatic isocyanate curing agent designed to provide ambient- or low-temperature crosslinking for hydroxyl-functional resins, enabling improved hardness, chemical resistance, and durability without requiring high-bake conditions.
Q2: How does B1358A differ from traditional aromatic isocyanate curing agents?
A: Unlike aromatic isocyanates, B1358A is based on aliphatic chemistry and features a thermally reversible blocking group—offering superior UV stability, non-yellowing performance, and reduced volatility, making it suitable for high-performance clearcoats and exterior applications.
Q3: What types of resin systems is B1358A typically compatible with?
A: B1358A shows good compatibility with hydroxyl-functional acrylics, polyesters, and alkyds. It is commonly used in two-component (2K) solventborne and high-solids coating systems where controlled reactivity and extended pot life are required.
Q4: What is the typical activation temperature range for B1358A?
A: Full de-blocking and crosslinking generally occur between 100 °C and 140 °C, depending on formulation composition and cure time. Its thermal latency allows for ambient storage stability and processing flexibility prior to final cure.
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