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Excellent weather resistance and UV stability for long-term outdoor performance.
High gloss retention and superior color stability in powder coating formulations.
Optimized melt viscosity for smooth extrusion and excellent film formation.
Good compatibility with standard triglycidyl isocyanurate (TGIC) and hydroxyalkyl amide (HAA) curing agents.
Low volatile organic content (VOC-free), supporting sustainable powder coating processes.
Architectural aluminum extrusions for curtain walls and window frames.
Automotive exterior trim and non-under-hood components.
Outdoor furniture and garden equipment coatings.
Steel and aluminum fencing, railings, and structural elements.
Consumer electronics enclosures requiring durable decorative finishes.
| Chemical Type | Saturated polyester resin |
| Product Form | Pale yellow to light amber solid granules |
| Appearance | Free-flowing granular solid |
| Acid Value (mg KOH/g) | 24–28 |
| Hydroxyl Value (mg KOH/g) | 3–6 |
| Gardner Color (10% w/w in MEK) | ≤ 2 |
| Melt Viscosity (200°C, Pa·s) | 25–40 |
| Softening Point (°C, Ring & Ball) | 78–84 |
Q1: What is the primary application of Uralac SN889 in powder coating formulations?
A: Uralac SN889 is specifically designed as a low-viscosity, high-reactivity saturated polyester resin for use in TGIC-free and HAA-based polyester–polyurethane hybrid powder coatings, particularly where excellent flow, smoothness, and mechanical durability are required.
Q2: How does Uralac SN889 differ from standard saturated polyesters used in general-purpose powder coatings?
A: Unlike conventional saturated polyesters, Uralac SN889 features a tailored molecular architecture that delivers enhanced reactivity with crosslinkers like hydroxyalkyl amides (HAA), improved melt viscosity control, and superior resistance to yellowing under UV exposure and thermal stress.
Q3: Is Uralac SN889 compatible with common powder coating additives and pigments?
A: Yes — Uralac SN889 demonstrates broad compatibility with standard powder coating additives including flow agents, degassing agents, benzoin alternatives, and both organic and inorganic pigments. Compatibility testing under specific formulation conditions is recommended to optimize performance.
Q4: What storage conditions are recommended to maintain resin stability?
A: Store Uralac SN889 in its original sealed container in a cool, dry, and well-ventilated area, protected from direct sunlight and excessive heat. Avoid prolonged exposure to temperatures above 35 °C to preserve reactivity and prevent premature viscosity increase.
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E-mail: wangxingqiang@ericwchem.com
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