Epoxy-Polyester powder coating
Overview
Epoxy-Polyester Hybrid Powder Coating is one of the versatile coating solutions of KGE Group. By combining epoxy and polyester resins, it provides a balanced combination of adhesion, mechanical durability, chemical resistance, and decorative performance for a wide range of indoor metal applications.
Introduction
Polyester Epoxy Powder, also known as Epoxy-Polyester Hybrid Powder Coating, is a thermosetting powder coating that combines epoxy resin and polyester resin in a single coating system. This hybrid formulation balances the protective properties of epoxy with the surface appearance and application characteristics of polyester.
It provides excellent mechanical strength, adhesion, and chemical resistance. In addition, the polyester component improves resistance to over-bake yellowing and enhances color stability during thermal curing. As a result, hybrid powder coatings are ideal for indoor metal surfaces, electrical appliances, and machinery parts where both durability and aesthetic appearance are required.
However, epoxy-polyester hybrid powder coatings are primarily intended for non-UV-exposed environments, as their epoxy content can cause chalking and fading under prolonged UV exposure. Depending on the formulation, these coatings typically cure at 140°C–220°C, with bake times of approximately 5–30 minutes.
Features
Balanced Performance
The combination of epoxy and polyester resins delivers a balanced combination of adhesion, hardness, mechanical durability, chemical resistance, and surface appearance.
Strong Adhesion
The coating provides good adhesion to properly prepared metal substrates, helping maintain coating integrity and long-term performance during service.
Good Mechanical Resistance
The cured coating provides good hardness and resistance to impact, abrasion, and everyday mechanical wear, supporting reliable performance in indoor applications.
Good Chemical Resistance
Epoxy-polyester hybrid coatings provide resistance to a range of chemicals and household substances, helping protect metal surfaces in various indoor applications.
Excellent Surface Appearance
The hybrid system provides a smooth and attractive finish with a wide range of colors, gloss levels, and surface effects to meet different aesthetic requirements.
Versatile Formulation
Epoxy-polyester hybrid powder coatings can be formulated for different indoor applications and performance requirements, making them a versatile solution for general metal products.
Key Application
Epoxy-polyester hybrid powder coatings are primarily used for indoor metal applications where both protective performance and decorative appearance are required. Typical applications include:
Metal furniture
White goods
Home appliances
Lighting equipment
Heating systems（e.g. panel radiators and boilers）
Giftware
Automotive parts, (e.g. wheel rims and seat frames)
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
Does coating thickness affect the final appearance?
Yes. Film thickness can influence surface appearance, gloss, coverage, and overall coating performance. The recommended thickness should follow the requirements of the specific coating system.
What can cause surface defects after powder coating?
Surface defects can result from factors such as substrate contamination, inadequate pretreatment, improper application, incorrect film thickness, or unsuitable curing conditions. Controlling the complete coating process is important for achieving a consistent finish.
How should hybrid powder coating be stored before use?
Powder coating should generally be stored in a dry, cool environment away from direct sunlight, moisture, and excessive heat. Specific storage requirements should follow the product’s technical documentation.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.
What causes gloss or color variation in powder coating?
Variations can be related to differences in powder formulation, film thickness, curing conditions, substrate preparation, application parameters, or contamination during production. Consistent process control helps minimize color and gloss variation.
Can hybrid powder coating be customized for specific applications?
Yes. Powder coating formulations can be adjusted according to requirements such as color, gloss, surface texture, appearance, and specific application conditions. The appropriate formulation should be confirmed based on the customer’s application requirements.
Send Us a Message
