1. Product Overview

This product is a thermosetting modified epoxy heavy-duty anti-corrosion powder coating specially designed for the corrosion protection of epoxy-coated steel reinforcement bars.

The product adopts imported two-step special epoxy resin, partially functional epoxy resin, and a specially formulated anti-corrosion curing agent. With a unique formulation design, it has been tested and practically applied by authoritative organizations.

It features excellent reactivity, extremely strong adhesion, good toughness and bendability, as well as outstanding resistance to chemicals, solvents, cathodic disbondment, and impact.

2. Main Technical Specifications

Curing Conditions

Curing Temperature	Curing Time
230℃	1 min

Powder Properties

Test Item	Test Method	Technical Specification
Appearance	Visual Inspection	Uniform color, no agglomeration
Color	—	According to customer requirements
Density (g/cm³)	GB/T 4472	1.30-1.50
Particle Size Distribution (%)	GB/T 6554	150 μm ≤ 3.0
Particle Size Distribution (%)	GB/T 6554	250 μm ≤ 0.2
Volatile Content (%)	GB/T 6554	≤ 0.6
Magnetic Material Content (%)	GB/T 2482	≤ 0.002
Gel Time (s)	GB/T 6554	200℃ ≤ 10
Curing Time (s)	GB/T 6554	230℃ ≤ 60

Coating Performance

Test Item	Test Method	Technical Specification
Appearance	Visual Inspection	Smooth, continuous coating with no bubbles, cracks, or shrinkage cavities
Continuity	GB/T 25826	No pores, voids, cracks, or visible defects
Cathodic Disbondment (1.5V, 168h) (mm)	GB/T 25826	≤ 2
Bending Resistance (40mm)	GB/T 50152	No visible cracks, fractures, or coating peeling
Bond Strength	GB/T 50152	Bond strength of coated steel reinforcement bars shall be no less than 85% of uncoated steel reinforcement bars
Impact Strength	GB/T 25826	No coating fragmentation
Chloride Ion Penetration Resistance (45d, 3mol/L NaCl) (CCI, mol/L)	GB/T 25826	< 1×10⁻⁴
Chemical Corrosion Resistance (55℃, 28d)	GB/T 25826	No softening, no blistering, good adhesion, no micropores, no depressions
Abrasion Resistance (1000g, 1000r) (mg)	GB/T 1768	≤ 100
Salt Spray Resistance (5% NaCl, 800h) (mm)	GB/T 25826	≤ 3

Surface Pretreatment Requirements

Oxide scale on the steel reinforcement surface must be completely removed, exposing the original metallic surface color.

The surface roughness treatment quality shall comply with relevant standards. A surface roughness of 50-70 μm is recommended.

The rust removal grade shall reach Sa2½ grade (GB/T 8923), with no oxides or other contaminants remaining on the steel surface.

The preheating temperature should be controlled between 220-245℃.

Application Methods

This series of products is suitable for the following coating methods:

Corona electrostatic spraying

Tribo electrostatic spraying

Electrostatic fluidized bed spraying (requirements must be specified in advance)

Fluidized bed hot dip coating (requirements must be specified in advance)

Other spraying methods (requirements must be specified in advance)

3. Application Range

This product can be widely used for:

Steel reinforcement bars

Steel wire ropes

Construction projects

Basements

High-speed railway projects

Other corrosion protection applications

4. Safety and Hygiene

This product is non-toxic, environmentally friendly, and non-flammable. However, appropriate protective measures should be taken to prevent excessive inhalation during construction and application.

5. Packaging, Storage and Transportation

The product is packed in cardboard cartons with polyethylene inner bags.

Net weight: 25 kg per package.

Store in a dry, ventilated, and clean environment below 30℃ for up to 12 months. Keep away from fire sources and heating equipment.

After opening, any unused powder must be resealed properly to prevent moisture absorption from the air.

Protect from direct sunlight and rain. When the ambient temperature exceeds 35℃, appropriate insulation measures should be taken during storage and transportation.