Special Epoxy Powder Coating for Steel Reinforcement Bars
We are a manufacturer based in China. We specialize in providing high-quality Special Epoxy Powder Coating for Steel Reinforcement Bars for industrial clients across various sectors. Whether you need chemicals consultation or technical support, our team is here to help.
Category：Application industries, powder Coating Own Brand：MT /MOQ:100KG /From China/ B2B only.
Introduction
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.
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