Pure polyester weather-resistant powder coating

Surface Finish Options Overview

Product model

OWP

Product characteristics

Excellent weather resistance and mechanical properties

Product application

Used for surface coating of steel bridges, highway guardrails, courtyard fences, metal building components, solar water heaters, collectors, outdoor transformers, bicycles, cars, agricultural locomotives and other outdoor steel and aluminum components.

Quality index

Standard number：Q/JSQ13-2006

Construction reference

Construction method:

spraying, voltage 50~100kv, air pressure 0.5~1.5kg/cm², spraying distance 150~300mm, paint film thickness 60~80um, curing temperature 180℃/15min or 200℃/10min.

Construction instructions:

The workpiece should be pre-treated before spraying to thoroughly remove surface contaminants. The compressed air should be oil-free and water-free and the oil-water separator should be checked frequently for normal operation. The working chuck should be of appropriate size and cleaned regularly to maintain a good connection with the grounding transmission part. The powder feeder, powder gun and recycling system should be free of pollution and should not be mixed with powder coatings of different manufacturers or models, otherwise it will affect the appearance of the final coating. The temperature in the oven should be uniform, and the temperature difference of each part should not be greater than ±5℃ to reduce color difference. The recycled powder coating must be sieved and then mixed with new powder in the specified proportion. Dust should be avoided in the construction site to avoid affecting the appearance of the coating.

Packaging specifications

20kg/carton

Storage instructions

The product is sealed and stored in a ventilated place at room temperature (<35℃). The storage period is one year from the date of completion of production. Expired products can still be used after passing the inspection.

Quality statement

The information and data provided in this manual are only used as our company’s suggestions for customers to refer to when selecting products. Although our company strives to ensure the accuracy of the information and data provided, in actual applications, many factors such as substrates, construction conditions, and use environment are beyond our control. Therefore, our company can only be responsible for the quality commitment of the relevant products themselves, and is not responsible for other aspects.

FAQ

1. What is Powder Coating?

Powder coating is a dry finishing process used to apply a protective and decorative coating on metal or other surfaces. Instead of using liquid paint, fine powder particles (usually made of polyester, epoxy, or hybrid resins) are electrostatically charged and sprayed onto a conductive surface. The coated object is then baked in an oven, where the powder melts, flows, and cures into a smooth, durable finish.

Key features:

Durable, hard finish

Resistant to scratches, corrosion, and UV

Environmentally friendly (no VOCs)

2. Benefits of Powder Coating

Powder coating offers several advantages over traditional liquid painting:

Durability: Resistant to chipping, scratching, fading, and wear.

Corrosion Protection: Provides excellent protection against rust and chemicals.

Environmentally Friendly: No volatile organic compounds (VOCs) and minimal waste.

Efficiency: Overspray can be collected and reused, up to 99% material utilization.

Uniform Finish: Smooth, even coating without runs or drips.

Cost-Effective: Single-coat systems can achieve high film thickness, reducing labor and energy.

Aesthetic Variety: Wide range of colors, textures, and effects.

3. What Temperature to Cure Powder Coating

The curing temperature depends on the type of powder used:

Epoxy powder: ~160–200°C (320–392°F)

Polyester powder: ~180–210°C (356–410°F)

Hybrid (Epoxy-Polyester) powder: ~180–200°C (356–392°F)

Typical curing time: 10–20 minutes depending on thickness and oven type.

Always follow the powder manufacturer’s specifications for best results.

4. Process for Powder Coating

The powder coating process usually follows these steps:

Surface Preparation:

Clean the surface thoroughly (remove oil, grease, rust, or dirt)

Methods: chemical cleaning, sandblasting, or phosphating

Pre-Treatment:

Apply a conversion coating or primer if needed to improve adhesion

Powder Application:

Spray the powder using an electrostatic spray gun or fluidized bed

Curing:

Bake the coated object in an oven at the recommended temperature for the powder type

The powder melts and forms a continuous, smooth film

Cooling & Inspection:

Let the coated item cool

Inspect for defects, uniform coverage, and desired thickness

5. How to Spray Powder Coat

Equipment Needed:

Electrostatic spray gun

Compressed air supply

Powder feed hopper or container

Grounding of the object

Steps:

Ground the object: Ensures the charged powder is attracted to the surface.

Spray evenly: Hold the gun 6–12 inches from the surface, moving in smooth, overlapping strokes.

Apply sufficient powder: Ensure full coverage without excessive buildup.

Cure immediately: Transfer the sprayed item to the curing oven to fuse the powder into a solid coating.

Tips:

Maintain consistent speed and distance while spraying.

Use proper ventilation to reduce airborne powder accumulation.

Test a small area to check film thickness and color before full application.