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High hydroxyl functionality for robust crosslinking with melamine and polyisocyanate curing agents.
Excellent compatibility with common solvent-based coating systems including polyester, alkyd, and other acrylic resins.
Provides outstanding gloss retention, color stability, and UV resistance in demanding exterior applications.
Designed for low-VOC formulations while maintaining balanced viscosity and film-forming performance.
Consistent batch-to-batch reproducibility supported by stringent in-process quality control.
Automotive OEM clearcoats and basecoats requiring high durability and aesthetic performance.
Industrial maintenance coatings for metal substrates exposed to harsh environmental conditions.
General-purpose coil coatings where excellent flexibility, hardness, and corrosion resistance are required.
High-performance architectural coatings for aluminum composite panels (ACPs) and extrusions.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow to amber liquid |
| Solvent System | Aromatic hydrocarbons (e.g., xylene, Solvesso™ 100) |
| Non-Volatile Content (wt%) | 50 ± 2% |
| Hydroxyl Value (mg KOH/g) | 75–85 |
| Acid Value (mg KOH/g) | < 5 |
| Viscosity (mPa·s, 25°C) | 4,000–6,000 (Brookfield, spindle #3, 20 rpm) |
Q1: What is the primary function of Hypomer FS-2820 in coating formulations?
A: Hypomer FS-2820 is a hydroxyl-functional acrylic resin designed primarily as a reactive binder in two-component polyurethane and melamine-cured systems. It contributes to film formation, crosslink density, hardness development, and chemical resistance while maintaining good clarity and UV stability.
Q2: How does FS-2820 compare to conventional hydroxyl acrylic resins in terms of compatibility and processing?
A: FS-2820 exhibits broad solvent compatibility with common coating solvents (e.g., esters, ketones, aromatic hydrocarbons) and demonstrates good miscibility with other acrylics, alkyds, and polyester resins. Its viscosity profile and molecular weight distribution are optimized for ease of incorporation into high-solids and low-VOC formulations without excessive gelation risk during storage or mixing.
Q3: Is FS-2820 suitable for use in automotive refinish or OEM coatings?
A: Yes — FS-2820 is formulated to meet performance expectations in demanding industrial applications including automotive refinish and select OEM topcoats, where it supports excellent gloss retention, sandability, and adhesion to various substrates such as metal, plastic, and primed surfaces.
Q4: What types of curing agents are typically used with this resin?
A: FS-2820 is compatible with standard aliphatic and aromatic isocyanate crosslinkers (e.g., HDI trimer, IPDI-based adducts) as well as amino resins such as high-ortho melamines. Cure speed, pot life, and final film properties can be adjusted by selecting appropriate crosslinker type, NCO:OH ratio, and catalyst level.
Q5: Can FS-2820 be used in waterborne hybrid systems?
A: While FS-2820 is supplied in organic solvent, it may be incorporated into solvent-borne or solvent-reduced hybrid systems where partial water tolerance is required. For fully waterborne applications, Elementis recommends evaluating specifically designed water-dispersible hydroxyl acrylic alternatives rather than attempting direct substitution.
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