Epoxy Anti-Corrosion Powder Coating for Safe Drinking Water Pipes

Surface Finish Options Overview

Product Introduction:
This product is formulated using special epoxy resin, dedicated curing agents, nano-grade antimicrobial agents, and food-grade pigments and fillers. It features high reactivity, strong adhesion, high cross-link density, and excellent resistance to chemicals, solvents, cathodic disbondment, as well as superior and durable antimicrobial effects, flexibility, and impact resistance.

Product Usage:
Suitable for municipal drinking water supply pipes.

Product Features:

Excellent adhesion to the substrate.Good leveling and high gloss on the coating surface.Strong resistance to permeation and corrosion.High surface hardness and dense coating.Superior high-temperature cathodic disbondment resistance.Good mechanical properties and extremely strong flexibility.Low melting temperature, high reactivity, and high curing completion rate.The product has passed the EU WRAS water safety certification and meets the safety evaluation standards for materials in contact with drinking water.

Powder Performance:

Property	Specification	Notes
Mechanical Strength	High	Ensures durability and resistance to mechanical stress
Shrinkage	Low	Minimizes dimensional changes during curing, maintaining precision
Processing Performance	Excellent dispersibility and lubricity	Facilitates smooth molding and reduces wear on molds
Electrical Properties	High glass transition temperature, wide operating temperature range	Ensures stable performance across a broad temperature spectrum
Dielectric Properties	Excellent chemical and solvent resistance	Protects against degradation from chemical exposure
Environmental Performance	100% solid content, no harmful substances	Complies with environmental regulations and promotes sustainability

Curing Conditions:

Property	Specification	Notes
Temperature	Referenced to workpiece temperature	Deviations may affect performance; ensure accurate temperature control for optimal results

Application Parameters:

Parameter	Specification	Notes
Applicable Equipment	Frictional charging spray, corona electrostatic spray, dip coating, roll coating
Film Thickness	200-600um	Adjustable according to workpiece requirements

Health and Safety:

Property	Specification	Notes
Toxicity	Non-toxic	Safe for handling and application
Flammability	Non-flammable	Reduces risk in storage and use
Regulation	GB15607-1995	Follow safety protocols for coating operations

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 180-230°C
Storage	Ventilated, dry, below 30°C, away from heat sources, corrosive chemicals, and solvents, avoid strong light, maximum stack height 5 layers, avoid long-term pressure, keep packaging sealed	Ensures product stability and prevents degradation
Curing Temperature	Preheat steel pipe surface to above 200°C for better curing completion rate
Mixing Powders	Do not mix with other anti-corrosion powders or recycled powders. Thoroughly clean the spraying equipment when changing colors to ensure drinking water safety and meet EU WRAS water safety standards
Compliance	Meets EU WRAS water safety standards

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.