Epoxy Anti-Corrosion Powder Coating for Firefighting Pipes

Surface Finish Options Overview

Product Introduction:
This product is formulated using linear phenolic epoxy resin, polyurethane-modified epoxy resin, and advanced curing agents, designed and manufactured based on the latest formulation concepts. It features high reactivity, strong adhesion, high cross-link density, and excellent resistance to chemicals, solvents, cathodic disbondment, impact, and high temperatures.Product Usage:
For internal and external anti-corrosion coatings of water supply pipes used in firefighting systems.Product Features:Excellent adhesion to the substrate.Strong anti-corrosion capability.Good leveling, high gloss, and dense coating.Superior high-temperature cathodic disbondment resistance.Extremely strong flexibility, capable of passing the 4/5 flattening and post-grooving tests.Good performance in withstanding high and low temperatures.Strong resistance to boiling water.Powder Performance:

Property	Specification	Notes
Adhesion	Excellent
Corrosion Resistance	Superior
Leveling	Good, high gloss, dense coating
Cathodic Disbondment Resistance	Excellent at high temperatures
Flexibility	Extremely strong, passes 4/5 flattening and post-grooving tests
Temperature Resistance	Good performance in high and low temperatures
Boiling Water Resistance	Strong resistance

Curing Conditions:

Property	Specification	Notes
Temperature	Referenced to workpiece temperature	Deviations may affect performance
Heating Method	Medium-frequency heating or other heating methods

Application Parameters:

Parameter	Specification	Notes
Applicable Equipment	Frictional charging spray, corona electrostatic spray, dip coating
Film Thickness	150-450um	Adjustable according to workpiece requirements

Health and Safety:

Property	Specification	Notes
Toxicity	Non-toxic
Flammability	Non-flammable
Regulation	GB15607-1995	Coating operation safety regulations

Precautions:

Item	Specification	Notes
Outdoor Use	Not recommended	May cause fading and chalking
Surface Preparation	Oil-free, water-free, surface treatment to Sa21/2 level (GB/T8923), anchor pattern depth 40-100um, clean surface from dust and abrasives
Preheating	Temperature controlled between 180-240°C
Storage	Ventilated, dry, below 30°C, away from heat sources, corrosive chemicals, and solvents, avoid strong light, maximum stack height 4 layers, avoid long-term pressure, keep packaging sealed
Curing Temperature	Preheat steel pipe surface to above 200°C for better curing completion rate

Compliance Standards:
GB/T 5135.20-2010 “Coated Steel Pipes for Automatic Sprinkler Fire-Protection Systems”;
CJ/T 120-2008 “Plastic-Coated Composite Steel Pipes for Water Supply”

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.