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EnglishHigh-Gloss Polyester Powder Coating
Industrial-grade protective coating solutions: environmentally friendly, durable, and cost-effective.
Intro to High-Gloss Polyester Powder Coating
High-Gloss Polyester Powder Coatings are formulated for applications demanding both an attractive, reflective finish and robust exterior durability. This thermosetting powder system utilizes polyester resins that impart excellent resistance to ultraviolet (UV) light and weathering, making them suitable for long-term outdoor exposure. The high-gloss finish, typically defined as 85 gloss units or higher at 60∘, delivers a deep, vibrant appearance that enhances the aesthetic of the coated substrate. Its robust mechanical properties, including flexibility and impact resistance, ensure the coating remains intact even under moderate stress. This coating is commonly used in architectural components, outdoor equipment, and transportation sectors where maintaining color and gloss retention over time is critical.
The Chemistry and Performance of High-Gloss Polyester
Polyester powder coatings are distinguished by the use of saturated polyester resins, typically cross-linked with a curing agent like TGIC (Triglycidyl Isocyanurate) or a Primid-based equivalent (TGIC-Free). This chemical structure is inherently stable against photolytic degradation caused by sunlight, providing reliable exterior performance. The high-gloss formulation is achieved through precise manipulation of the resin system and pigment volume concentration, resulting in a smooth, continuous film that maximizes light reflection. Film integrity is maintained across a range of operational conditions, demonstrating resistance to chipping, scratching, and general wear. Cure cycles are flexible, usually requiring 180∘C to 200∘C for 10-20 minutes, which balances throughput with energy consumption. Furthermore, the material exhibits strong adhesion to properly pre-treated metals, including aluminum and steel, ensuring prolonged protection against corrosion mechanisms. For specialized applications, modifications can be made to enhance flow characteristics and leveling, minimizing orange peel and surface imperfections, thereby contributing to the final high-gloss appearance.
Specifications
| Property | Standard Range/Value |
| Gloss Level (60∘) | ≥85 units |
| Specific Gravity | 1.2 to 1.7 g/cm3 (Color dependent) |
| Film Thickness (Recommended) | 60 to 80 microns |
| Pencil Hardness (ASTM D3363) | H - 2H |
| Impact Resistance (ASTM D2794) | ≥50 in-lbs (Direct/Reverse) |
| Salt Spray Resistance (ASTM B117) | >1000 hours (Depending on pretreatment) |
| Cure Schedule | 180∘C/15 min or 200∘C/10 min |
| Chemical Base | Polyester |
Application Fields
- Architectural Metalwork: Window frames, aluminum extrusions, and façade components.
- Outdoor Furniture: Patio sets, seating, and decorative metal features.
- Automotive Components: Chassis parts, coil springs, and trim (where high UV resistance is needed).
- Agricultural Equipment: Tractor parts, farming machinery frames.
- General Industrial: Electrical cabinets and housings exposed to the elements.
Key Characteristics
- UV and Weathering Stability: Maintains color and gloss integrity after prolonged sunlight exposure.
- Aesthetic Reflection: Provides a deep, mirror-like finish (Gloss ≥85).
- Mechanical Performance: Exhibits a balanced profile of flexibility and resistance to impact damage.
- Efficient Application: High transfer efficiency and flow characteristics support cost-effective application and minimal surface defects.
- Wide Color Range: Available in a vast spectrum of RAL and custom color matches.
Comparison: High-Gloss Polyester vs. Other Chemistries
| Feature | Polyester (High-Gloss) | Epoxy (High-Gloss) | Polyurethane (High-Gloss) |
| Exterior Durability | Excellent (High UV resistance) | Poor (Chalks rapidly in UV) | Very Good (High Gloss Retention) |
| Chemical Resistance | Good | Excellent | Very Good |
| Mechanical Flexibility | Very Good | Good | Excellent |
| Cost Efficiency | Medium | Low | High |
Why choose us
Customization: We have a strong R&D team,and we can develop and produce products according to different requirement of customers.
Cost: We have our own raw material production center.So we can offer the most favourable price and good-quality products directly.
Quality: We have our own testing lab and the most advanced and complete inspection equipment, which can ensure the quality of our products.
Capacity: Our annual production capacity is over 30000 tons, we can meet the needs of different customers with diverse purchase quantity.
Service: We focus on developing high-quality products for top-end markets. Our products are in line with international standards, and are mainly exported to Europe, America, Southeast Asia, South America and other destinations around the world.
Shipment: We are only 200 kilometers away from the Shanghai Port and 230 kilometers to Ningbo port, it is very convenient and efficient to ship goods to any other countries.
Customization
Quality
Capacity
Service
Shipment
Frequently Asked Questions (FAQs)
- Q: Can this coating be applied over galvanized steel?
- A: Yes. However, proper pre-treatment, which typically involves zinc phosphating or a chromate-free conversion coating, is mandatory to prevent adhesion loss and gassing during the curing process.
- Q: What is the typical gloss retention percentage after one year of exterior exposure?
- A: Under typical temperate climate conditions, well-formulated High-Gloss Polyester is expected to retain over 70-80% of its initial 60∘ gloss after 12 months, depending on geographic location and resin quality.
- Q: Is a primer necessary for standard steel substrates?
- A: For standard steel in C1/C2 environments, a single coat is usually sufficient. For highly corrosive environments (C3 and above), or for maximum longevity, the use of a Zinc-Rich Primer is recommended as a dual-layer system.
Selection Guide: High-Gloss Polyester
High-Gloss Polyester is the appropriate selection when the application meets the following criteria:
- The component will be exposed to direct sunlight and weather for an extended period, requiring high UV stability.
- The finished product requires a smooth, highly reflective surface for aesthetic appeal (Gloss ≥85).
- The substrate is a metal (steel, galvanized, or aluminum) and requires medium-to-high corrosion protection.
- The required cost structure allows for a coating that is more performance-driven than standard epoxy, but less expensive than high-end fluoropolymers (PVDF/FEVE).
- The component is subjected to moderate physical stress, requiring good impact and bending flexibility.
