Valves and pipes powder coating

Surface Finish Options Overview

The main components are epoxy resin and curing agent.

Brief description

It is mainly composed of epoxy resin and curing agent.

Features

Excellent mechanical properties (impact resistance, hardness, toughness, adhesion, etc.)Good coating surface effectStrong corrosion resistanceGood insulation

Application areas

Mechanical and electrical equipment, safes, industrial equipment, pipelines, steel wires, chemical laboratory equipment and other anti-corrosion fields

Product series

Standard curing type and low temperature curing type are available

Can be made into various glosses and colors

Can be made into hot melt epoxy

Technical parameters

Powder performance

Specific gravity: 1.1~1.8g/cm³

Mechanical properties

Test items	Test standards	Performance indicators
Pencil hardness	GB/T6739-1996	>2H
Adhesion	GB/T9286-1998	Grade 0
Bending	GB6742-86	Φ3mm
Impact	GB/T1732-93	50kg.cm
Cupping	GB9753-88	>6mm

Corrosion resistance

Test items	Test standards	Performance indicators
Salt spray resistance	GB/T1771-91	No change in coating after 1000 hours, unilateral corrosion at scratches <2mm
​Moisture and heat resistance	GB/T1740-79	Slight gloss loss after 1000 hours, ≤1 level

Note: The above parameters are laboratory data and are for reference only. The actual indicators are related to factors such as customer environment, equipment, materials, pretreatment, and spraying process.

Application conditions

Pretreatment: phosphating, chromating, sandblasting

Coating: Suitable for corona electrostatic spraying, friction electrostatic spraying, electrostatic fluidized bed spraying, fluidized bed dipping

Curing conditions:

200℃ at 10 minutes

180℃ at 15 minutes

Can also be designed according to customer needs

Drinking water product certification

British WRA5 standard

US NSF61 standard

German KTW/W270 standard

Drinking water valve testing standards: BS/EN14901. ANSI/NSF61

Packaging

Carton packaging, net weight 20kg/box

Lined with double-layer polyethylene plastic bags

Storage conditions

Store in a dry and ventilated room below 30℃

Avoid direct sunlight

Under this condition, the powder can be stably stored for 6 months

Safety and health

All raw materials of powder coatings do not contain toxic substances.No toxic gas is released during baking.Avoid inhalation of dust during use.Operators should wear dust masks.Minimize long-term contact between skin and powder.Paint attached to the skin can be washed with soap.

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.