Epoxy-Polyester Thermosetting Electrostatic Spray Powder Coating

Surface Finish Options Overview

Product Overview

Model: MT-062A Yellow powder coating

Epoxy-polyester thermosetting electrostatic spray powder coating is a hybrid material combining epoxy resin and polyester resin, offering superior flowability, decorative properties, mechanical strength, and corrosion resistance. This coating is widely used for indoor metal surface protection in automotive, home appliance, metal furniture, instrumentation, fitness equipment, and radiator industries. Its dual-resin formulation ensures excellent adhesion, impact resistance, and chemical stability, making it a preferred choice for high-performance industrial applications.

Technical Specifications

Parameter	Specification
Density	1.1–1.8 g/cm³ (varies by type/color)
Horizontal Flowability	18–35 mm
Particle Size Distribution	100% < 125 μm; >85% within 60–90 μm
Curing Conditions	Standard: 180°C (workpiece temp.) for 15 min
	Low-Temperature: 160°C for 15 min
Coverage Rate	9–12 m²/kg at 80 μm film thickness (100% utilization)
Gloss Levels	High-gloss (>80%), Semi-gloss (40–60%), Matte (15–50%)
Mechanical Properties	Pencil Hardness: ≥2H (GB/T 6739-86)
	Adhesion: Grade 0 (GB/T 9286-88)
	Bending Test: Pass at 3 mm taper (GB/T 11185-88)
	Impact Resistance: ≥50 kg·cm (GB/T 1732-93)
Corrosion Resistance	Salt Spray Test: 500 h (Grade 1. GB/T 1771-91)
	Humidity Resistance: 500 h (Grade 1. BS.3900 Part F2)
Cupping Test	6 mm deformation resistance

Application Fields

This coating is primarily used for indoor metal surface protection, including:

Automotive componentsHome appliances (e.g., refrigerators, washing machines)Metal furniture and office equipmentLighting fixtures and HVAC systemsInstrumentation and fitness equipment

Its adaptability to various curing conditions (standard/low-temperature) enables compatibility with diverse production schedules.

Storage and Transportation

Storage: Maintain below 25°C in ventilated, dry, and clean environments. Avoid direct sunlight, fire sources, and heating equipment. Stable shelf life up to 12 months when stored under recommended conditions.

Transportation: Use air-conditioned vehicles or transport during cooler periods to prevent heat-induced degradation. Avoid exposure to moisture or humidity, which may compromise powder flowability and electrostatic properties.

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.