Powder coating for aluminium is one of the most important surface treatment methods used for aluminium entrance doors, frames, and architectural applications. In addition to enhancing aesthetics, it protects aluminium against corrosion, UV radiation, humidity, and harsh weather conditions, significantly increasing the product’s lifespan.
What is Powder Coating for Aluminium
Powder coating is a process in which polyester powder is electrostatically charged and applied onto the aluminium surface using specialized spray guns. The coated profiles are then transferred into a curing oven, where the coating stabilizes at temperatures of approximately 180–220°C, creating a durable protective coating layer.
The Production Process
1. Chemical Pretreatment
The aluminium surface is cleaned from oils, dust, and oxidation through specialized chemical baths to ensure proper adhesion and anti-corrosion protection.
2. Electrostatic Spraying
The powder is electrostatically sprayed and evenly adheres to the aluminium surface.
3. Curing Process
The coated profile is heated inside an oven so that the coating forms a unified and extremely durable finish.
Main Types of Powder Coatings
Standard Durable (Class 1)
Basic architectural coating with good resistance to outdoor conditions.
Super Durable (Class 2)
Offers up to 3–5 times higher resistance to UV radiation and color fading. Ideal for coastal areas and demanding projects.
Fine Texture & Sand Texture
Special textured coatings providing increased scratch resistance and premium aesthetics.
Metallic & Special Effects
Metallic and special-effect finishes for modern architectural applications.
Weather Resistance
Certified coatings provide high protection against:
- UV radiation and color fading
- Humidity and corrosion
- Salt exposure and coastal environments
- Scratches and mechanical stress
- Extreme temperatures and weather changes
Super Durable coatings are considered ideal for demanding outdoor applications because they maintain gloss and color stability for many years.
What to Consider When Choosing a Coating
When selecting aluminium doors or frames, it is important to check:
- The coating category (Class 1 or Class 2)
- Proper pretreatment procedures
- Coating thickness and curing quality
- Suitability for coastal or urban environments
The right powder coating ensures long-term protection, premium aesthetics, and increased durability over time.
Conclusion
Powder coating for aluminium is a key quality factor for every modern aluminium door or architectural system. With proper pretreatment, certified powders, and advanced production processes, it can provide excellent aesthetics, high durability, and superior protection even under the most demanding weather conditions.
High-end aluminium entrance doors, such as TEHNi doors, utilize advanced powder coating systems to maintain their quality and appearance for decades. All doors are coated in TEHNi’s privately owned coating facilities, ensuring high quality at every stage of the coating process.
