Powder coating; how to improve weather resistance
Powder coating is a type of coating composed of resin, pigments, fillers, and various additives, with air used as the dispersion medium. With nearly 100% solid content and no organic solvents, it is considered an environmentally friendly coating technology.
Advantages of powder coating in industry
- Safe and more eco-friendly: It contains no organic solvents and is harmless to operators.
- High utilization rate: Overspray during the coating process can be recycled, resulting in a utilization rate of over 95%.
- Thick coating in one application: A single powder coating layer can reach 0.05–0.5 mm, significantly thicker than solvent-based coatings.
- Excellent performance: Powder coatings generally offer superior physical and mechanical properties, as well as better chemical and corrosion resistance compared with solvent-based coatings.
Main types of powder coatings
A. Epoxy Powder Coating
Features excellent metal adhesion, corrosion resistance, hardness, and flexibility. It is the earliest thermosetting powder coating to achieve commercial success.
B. Polyester Powder Coating
Resistant to yellowing during baking, with high gloss and good leveling properties. Commonly used for refrigerators, washing machines, bicycles, furniture, and other applications.
C. Polyvinyl Chloride (PVC) Powder Coating
Known for excellent solvent and salt-spray resistance. Mainly used for metal meshes, steel furniture, chemical equipment, and similar products.
D. Nylon Powder Coating
Non-toxic, odorless, and resistant to bacterial and mold attack. Suitable for food-related parts such as drinking-water pipes and food-packaging components.
Main applications
- Decorative and protective coatings: Appliances, metal furniture, automobiles, instruments, bicycles, electrical equipment, building hardware.
- Insulation and moisture-proof coatings: Automotive parts, electrical appliances, electronic components.
- Anti-corrosion coatings: Chemical tanks, oil pipelines, construction pipelines, and more.
Because many powder-coated applications—especially architectural aluminum profiles—demand excellent durability, enhancing weather resistance is essential.
Omnistab additives for improving weather resistance
| Product name | CAS no. | Key benefits |
| Omnistab UV P | 2440-22-4 | Excellent compatibility with common powder-coating systems including epoxy, polyester, and acrylate types. |
| Omnistab UV 234 | 70321-86-7 | Widely used in automotive powder coatings; performs well under high-temperature processing. |
| Omnistab LS 144 | 3843-89-0 | Helps reduce curing time, improves adhesion between the coating and substrate, and prevents yellowing during high-temperature baking. |
| Omnistab AN 626 | 26741-53-7 | A macromolecular phosphite antioxidant with stable performance and low volatility. |
Optimal performance through synergy
The combination of UV absorbers, HALS, and antioxidants provides a strong synergistic effect, significantly enhancing the weather resistance of powder coatings. This ensures long-lasting beauty, color retention, and surface protection.
FAQ’s
Weather resistance is influenced by several factors, including the type of resin used, UV exposure, pigment stability, coating thickness, and the presence of stabilizing additives such as UV absorbers, HALS, and antioxidants. High-quality additives significantly improve long-term durability and color retention.
Fading or yellowing typically results from prolonged exposure to UV radiation and high-temperature curing conditions. Without proper UV stabilizers and antioxidants, the resin and pigments degrade more quickly. Additives such as Omnistab LS 144 and UV 234 help prevent yellowing and improve color stability.
Yes. Many powder coatings, especially polyester-based systems, are designed for outdoor use. For applications requiring strong weather resistance (e.g., architectural aluminum profiles), it is recommended to include high-performance UV stabilizers and HALS for maximum durability.
No.
UV absorbers primarily absorb UV radiation and convert it into harmless heat.
HALS (Hindered Amine Light Stabilizers) neutralize free radicals that form during degradation.
When used together, they create a strong synergistic effect for superior light and weather resistance.
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