Polyester powder coating
Overview
Polyester Powder Coating is one of the most common types of powder coatings and one of KGE Group’s main coating products. Widely used in metal applications, particularly for building exteriors, it combines excellent surface appearance with reliable durability, adhesion, and corrosion resistance. With continuous formulation upgrades, KGE Polyester Powder Coating can reliably achieve 5–8 years of weather resistance, while offering a broad range of colors and finishes to meet both functional and aesthetic requirements.
With an annual production capacity of up to 50 million tons, KGE Polyester Powder Coating has been widely used in various large-scale building projects across China. Supported by 10+ production bases and 30 regional service centers, KGE maintains a robust supply chain to ensure stable and on-time delivery. This production and service network enables us to efficiently meet the requirements of large-volume orders and urgent project schedules.
| Durability | Products | Products Description | Warranty | Product Standards |
|---|---|---|---|---|
|
3–5 years Start to change color |
Liquid acrylic coatings Liquid polyester coatings Polyester resin powder coating Epoxy resin powder coating |
High quality coatings, for outdoor applications. Used for outdoor. |
5 years warranty |
AAMA 2603 QUALICOAT CLASS I |
Ordinary polyester powder coatings are made of outdoor polyester resin plus TGIC, which can meet the general requirements of outdoor products and comply with AAMA2603/ QualicoatClass I standard, with a weathering period of 5-8 years.
Introduction
Polyester Powder Coating is a thermosetting powder coating based on acid-functional polyester resins, widely used for decorative and protective applications on metal surfaces. Depending on the application, the coating can be crosslinked with different hardeners, such as TGIC (Triglycidyl Isocyanurate), HAA (Hydroxyalkylamide), or glycidyl ester, providing different performance characteristics for interior and exterior applications.
Polyester powder coatings offer excellent resistance to UV radiation and weathering, making them particularly suitable for exterior applications. They also provide good surface appearance and can be formulated in a wide range of colors, gloss levels, and surface textures, combining functional protection with aesthetic requirements.
Features
Weather Resistance
Designed for outdoor exposure, polyester powder coatings can provide good resistance to UV radiation and weathering.
Durable Protection
The cured coating forms a durable protective film with good resistance to mechanical damage and environmental exposure.
Corrosion Resistance
Polyester powder coatings can provide corrosion protection for metal substrates when combined with appropriate surface preparation and pretreatment.
Color & Finish Versatility
Available formulations can offer a broad range of colors, gloss levels, and surface textures to meet different decorative requirements.
Decorative & Functional
Polyester powder coatings are used for both decorative and functional applications, combining surface aesthetics with protective performance.
Key Application
Superdurable polyester powder coatings provide 2–3 times higher UV resistance than standard polyester powder coatings, making them particularly suitable for demanding exterior applications where long-term weatherability and color retention are required.
They combine strong mechanical and chemical resistance with superior resistance to yellowing compared with epoxy and hybrid systems. These properties make them especially suitable for:
- Architectural aluminum extrusions
- Agricultural machinery
- Automotive parts
Polyester powder coatings can be cured at temperatures ranging from 160°C to 240°C, depending on the formulation and application requirements.
Beyond exterior applications, polyester powder coatings can also be used for interior applications exposed to high temperatures, such as ovens and electric heaters, where their thermal stability provides reliable coating performance.
Data Sheet
| Test Item | Requirement | Result | Remark |
|---|---|---|---|
| Pencil Hardness | ≥2H | 2.5-3.5 | ASTM D3363 |
| Adhesion | 100/100 | 100/100 | ASTM D3359 |
| Impact Resistance | 50kg·cm | No cracks | ASTM D2794 |
| Bending Test | 1/8 inch | No cracks | ASTM D522 |
| Abrasion Resistance | ≥40L/μm | 45L/μm | ASTM D968 |
| Boiling Water Resistance | No abnormality | No abnormality | 2 hours |
| Acid Resistance | No change after 24h | No change | 5% HNO₃ |
| Alkali Resistance | No change after 24h | No change | 5% NaOH |
| Salt Spray Resistance | 1000 hours | No blistering | ASTM B117 |
| Damp Heat Resistance | 3000 hours | No change | ASTM D2247 |
| Detergent Resistance | No abnormality | No abnormality | 5% solution |
| Weather Resistance | 10 years | ≥85% | Florida outdoor exposure |
| UV Resistance | No chalking | Slight | QUV 4000h |
| Color Change | △E ≤ 5 | 3.2 | ASTM D2244 |
| Gloss Retention | ≥50% | 65% | ASTM D523 |
| Solvent Resistance | 50 MEK double rubs | Pass | ASTM D5402 |
| Surface Appearance | Smooth & uniform | Qualified | Visual inspection |
Q&A
What is polyester powder coating used for?
Polyester powder coating is widely used for architectural aluminum profiles, curtain walls, fences, outdoor furniture, and metal structures due to its excellent weather resistance, UV stability, and vibrant finish.
How long does polyester powder coating last?
Typically, polyester powder coatings last 10–15 years in standard outdoor conditions. With high-quality formulations and proper surface preparation, durability can exceed 20 years.
What is the difference between polyester and epoxy powder coating?
Polyester powder coatings offer superior UV and weather resistance, making them ideal for outdoor use, while epoxy coatings are best for indoor applications due to their excellent chemical resistance but poor UV stability.
Can polyester powder coating be applied to aluminum?
Yes. Polyester powder coating is especially suitable for aluminum surfaces, commonly used in window frames, facades, and aluminum panels. It provides a smooth, corrosion-resistant finish with excellent adhesion.
How should I choose a polyester powder coating for my application?
The selection should consider the intended environment, indoor or outdoor exposure, required weatherability, substrate, desired appearance, curing conditions, and performance requirements. For outdoor applications, the appropriate polyester grade and curing system should be selected according to the expected exposure conditions.
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