Polyurethane Powder Coating

Your Professional Polyurethane Powder Coating Supplier

Keyco powder coatings has more than 20 years experience in the research and development of powder metal coatings. with an annual production capacity of more than 30,000tons. The company attaches a great importance to innovation, invested millions of yuan in scientific research every year,established the Technology Research Institutes and developed school-enterprise cooperation with many domestic institutions of higher education.

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Why Choose Us

Quality Assurance

Strict QC inspection Good quality is top important during cooperation. We will make QC inspection strictly before ship out to make sure every piece stayed in a good condition.

OEM/ODM Service

Our professional R&D dept. can develop different products for different target prices and different requirements.

Production Line

The factory is equipped with 25 digital fully - automatic production lines, which greatly enhance production efficiency and product quality.

Continuous Supply Capability

We have several advanced professional production lines and R&D test lines, with an annual production capacity of 10,000 tons.

What is Polyurethane Powder Coating？

Polyurethane powder coating is a series of polyurethane based powder coating formulated for exterior environment. Offering excellent anti-corrosion and flexibility properties. Excellent smoothness and high gloss. Available for a wide range of colors and gloss levels to suit different applications.

Specification

Properties	Test standard	Target
Film Appearance	Visually	Smooth, slight orange peeled texture is allowed
Color Difference	GIE1976（Lab*）	Agreed Value
Gloss（60°）	GB/T9754-93	Agreed Value
Impact	GB/T1732-93	≥50kg.cm
Pencil Hardness	GB/T6739-96	≥2H
Adhesion（QFH Test）	GB/T9286-98	0 class
Flexure	GB/T1731-91	≤2mm
Acid Salt Spray Resistance	GB/T1771-93	500h No Visual Change
Humidity Resistance	GB/T1740-79	500h No Visual Change
QUV Aging Test （240 hrs Exposure Rate）	GB/T14552-93	≥65%
12 months explorture	GB-92-88	≥80%

Advantages of Polyurethane Powder Coating

Exceptional Durability
It offers excellent protection against chipping, scratching, and impacts, ensuring that coated surfaces remain in pristine condition even in challenging environments.

Chemical and Corrosion Resistance
Polyurethane coatings exhibit high resistance to chemicals and corrosion. This makes them suitable for use in industries where exposure to harsh substances is common, such as chemical processing or marine applications.

UV Resistance

Polyurethane powder coatings are known for their ability to withstand prolonged exposure to ultraviolet (UV) radiation. This property makes them ideal for outdoor applications, ensuring that the coating won’t degrade or lose its color under the sun.

Versatile Aesthetics

The versatility extends to aesthetics. They are available in a wide range of colors and finishes, providing ample customization options.

Environmental Friendliness

Coatings have low levels of Volatile Organic Compounds (VOCs), making them an eco-friendly choice.

Key Points To Consider During The Application Process Of Polyurethane Powder Coating

1. Surface Preparation: Before applying the powder, the substrate must undergo thorough cleaning to remove any contaminants like oil, grease, or rust. This crucial step ensures proper adhesion and a flawless finish. The substrate is freed from dust, scale, rust, grease, dirt, and any oxide layers (for example on aluminum).

2. Proper Grounding: The most common cause of application issues is poor grounding. There needs to be some kind of connection from your part - the substrate being coated - to that earthen ground, be it racks or hangers etc. Also, ensure that these connecting parts are clean, because if there is not good metal to metal contact the charge will not pass through as easily.

3. Gun Settings: Your gun settings may actually be the problem. Too much powder flow and incorrect kV levels can negatively affect an application. Straight away, make sure that you have a good earthen ground.

4. Regular Maintenance and Cleaning: A regular maintenance and cleaning system is a good process to have in place. Powder builds up on racks, electrodes, and hooks, and needs to be cleaned away regularly.

5. Temperature Control: Proper temperature control is essential for a successful powder coating application. Too high or too low temperatures can cause issues such as insufficient gloss, discoloration, orange peel texture, pinholes, and air bubbles.

6. Cleanliness: Keeping your workspace clean can help prevent contamination that could affect the finish of your powder coating.

7. Powder Application Techniques: Different powder application techniques can result in different finishes. It's important to understand the specific requirements of the powder you're using and adjust your application technique accordingly.

Applications of Polyurethane Powder Coating

Automotive Industry: Used for coating automotive parts such as wheels, trim, bumpers, and frames, polyurethane powder coatings provide a tough, chip-resistant finish that protects against wear, chemicals, and weather exposure.

Appliances: Ideal for coating household appliances like refrigerators, washing machines, and air conditioning units, providing a durable and aesthetically pleasing finish that resists scratches, chemicals, and heat.

Architectural and Building Materials: Polyurethane powder coatings are commonly used on metal window frames, doors, fencing, and railings, offering excellent protection against UV light, weathering, and corrosion.

Furniture: Suitable for coating both indoor and outdoor furniture, providing a durable, attractive finish that withstands wear, impact, and environmental exposure.

Industrial Equipment: The coatings provide protection for industrial machinery and equipment, ensuring resistance to chemicals, abrasions, and harsh environmental conditions.

Parameters

The State in the Container	Uniform color, without foreign matter, fluffy powder
Screenings (125μm)	Concerted
Appearance	Texture clear, equally distributed, without impurity and big particle
Hardness	Flat Surface ≥Fair, concerted with rough surface
Adhesion	≤ Level 2 (film thickness 60 ±10 μm)
Impact Resistance	≥ 40 cm (film thickness 60 ±10 μm)
Bending Test	≤ 4 mm (film thickness 60 ±10 μm)
Cupping Test	≥ 4 mm (film thickness 60 ±10 μm)
Alkalis Resistance (5% NaOH)	168 Hours no abnormal, concerted with metallic powder
Acids Resistance (3% HCI)	240 Hours no abnormal, concerted with metallic powder
Damp Heat Test	500 Hours no abnormal
Salt Mist Test	500 Hours no abnormal, ≤ 2.0mm corrosion at break line
Accelerated Aging Test	500 Hours, Fade ≤ 2 grades; Loss of gloss ≤ 2 grades;concerted with metallic powder
Heavy Metal	Almost Zero (Test by ROHS Standards)
Soluble Lead/chrome	Almost Zero (Test by ROHS Standards)

FAQ

Q: What is the advantage of polyurethane coating?

A: Polyurethane is very resistant to extreme temperature, meaning harsh environmental conditions and many chemicals rarely cause material degradation. Most polyether based polyurethanes do not support fungal, mold and mildew growth and are therefore highly suitable for tropical environments.

Q: What is the difference between polyester and polyurethane powder coating?

A: The higher hardness products typically sacrifice mechanical flexibility. Polyurethanes can be formulated from matte to high gloss with very good to excellent coating performance. Polyesters are more difficult to formulate in lower gloss and film performance can be reduced with some of these formulation schemes.

Q: What is the most durable type of powder coating?

A: Epoxies. Epoxies were the first powders that were widely used. They are extremely robust, have exceptional hardness, and have the best chemical and corrosion resistance of any powder on the market. Another advantage of this type of powder is its ease of usage and variety of cure schedules.

Q: How many years does powder coating last?

A: 15-20 years
Most powder coating applications last for 15-20 years. These coatings are highly resistant to weather, chemicals, and corrosion, and offer electrical insulation, and vibration and sound deadening benefits.

Q: How durable is polyurethane coating?

A: Durability. In terms of durability, polyurethane coatings are more resistant to water, chemicals, UV light, and other elements that lead to peeling. They can also be recoated within a day or two after being applied.

As one of the most professional polyurethane powder coating manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy bulk polyurethane powder coating made in China here from our factory. Contact us for customized service.

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