PVF steel drum coating

Surface Finish Options Overview

PVF steel drum coating is mainly used for packaging containers of chemical pesticide products, inner walls of cans and other special anti-corrosion fields.

PVF coating characteristics:

(PVF) coating is the abbreviation of polyvinyl fluoride (Polyvinyl Pluoride). The coating is made by grinding and processing with high molecular resin. It has many common characteristics of carbon-fluorine materials and has unique weather resistance.

(PVF) fluorine coating belongs to crystalline polymers. It is insoluble in solvents at room temperature. It can only be made into organic solvent dispersions with the help of additives and needs high-temperature baking to form a film. Therefore, it is found that it can only be wiped off by using solvents before high-temperature baking before film formation. After film formation, it is insoluble in solvents.

Main characteristics of the coating:

1. Corrosion resistance. It has excellent anti-corrosion performance for various oils, alcohols, ketones, esters, salts, alkalis, dilute acids and other chemical pesticide products. At present, it has been tested that it can contain more than 100 kinds of chemical products.

2.  Outstanding weather resistance, heat resistance and low temperature resistance, long-term use temperature is -70~110℃

3.  It has anti-humidity, anti-mildew and anti-salt spray performance.

4.  The coating has good flexibility, resistance to disassembly, wear resistance and impact resistance.

PVF coating quality indicators:

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.