Application industries, powder Coating

1. Product Overview

This product is a thermosetting modified heavy-duty anticorrosion epoxy powder coating specially developed for corrosion protection of epoxy-coated reinforcing steel bars. It is formulated with imported two-step special epoxy resin, partially functional epoxy resin, and specially designed anticorrosion curing agents.

Featuring a unique formulation design, this product has been verified through authoritative testing and practical applications. It provides excellent reaction activity, superior adhesion, outstanding toughness and bendability, as well as excellent resistance to chemical corrosion, solvents, cathodic disbondment, and impact, making it an ideal protective coating for reinforcing steel applications.

2. Product Features

(1) Excellent bonding strength with the substrate.

(2) The coating film is dense, continuous, smooth, highly resistant to penetration, and has fewer exposed defects.

(3) Excellent baking heat resistance and high electrical insulation performance.

(4) Strong bonding strength between the coating film and concrete, providing excellent gripping force.

(5) Excellent toughness, allowing bending without cracking.

(6) Low melting temperature, high reaction activity, high curing completion rate, and excellent mechanical properties.

(7) Strong versatility and low powder consumption.

(8) Reduces wire-drawing phenomena during powder spraying of reinforcing steel bars.

3. Powder Coating Performance Parameters

Item	Quality Requirements	Test Method
Appearance	Uniform color, no agglomeration	Visual inspection
Color	According to customer requirements	—
Density (g/cm³)	1.2–1.5	GB/T 4472
Average Particle Size	30–50 μm	Laser scattering particle size analyzer
Particle Size Distribution (%)	Residue on 150 μm sieve ≤3.0; residue on 250 μm sieve ≤0.2	GB/T 6554
Volatile Content (%)	≤0.6	GB/T 6554
Magnetic Material Content (%)	<0.002	GB/T 2428-86
Gel Time (s)	≤20 seconds at 200°C	GB/T 6554
Curing Time (s)	≤60 seconds at 230°C	GB/T 6554

4. Performance Parameters of Cured Powder Coating Film

No.	Test Item	Technical Requirements	Test Method
1	Appearance	Smooth, continuous coating film, no bubbles, cracking, or pinhole defects	Visual inspection
2	Cathodic Disbondment Resistance	≤2 mm	GB/T 25826-2010
3	Continuity	No holes, voids, cracks, or visible defects	GB/T 25826-2010
4	Bendability (40 mm)	No visible cracks, fractures, or coating peeling after bending	GB/T 25826-2010
5	Bond Strength	Bond strength of coated reinforcing steel ≥85% of uncoated reinforcing steel	GB 50152
6	Impact Strength	No coating fragmentation	GB/T 25826-2010
7	Chloride Ion Penetration Resistance	<1×10⁻⁴ M	GB/T 25826-2010
8	Chemical Corrosion Resistance	No softening, blistering, good adhesion, no micropores or depressions	GB/T 25826-2010
9	Abrasion Resistance	≤100 mg	GB/T 1768-1979
10	Salt Spray Resistance (800 h)	≤3 mm	GB/T 25826-2010

Applicable Standards:JG 3042-1997; GB/T 25826-2010

5. Precautions

(1) The oxide scale on the reinforcing steel surface must be completely removed, exposing the natural metallic surface. Surface roughness treatment should comply with relevant standards, with the recommended anchor profile depth of 50–70 μm. The rust removal grade should reach Sa2½ level (GB/T 8923). The steel surface must be free from chlorides and other contaminants. The preheating temperature should be controlled at 220–245°C.

(2) The product should be stored indoors in a well-ventilated and dry environment at temperatures below 27°C, away from heat sources, corrosive chemicals, and chemical solvents. Avoid direct exposure to strong sunlight. The maximum stacking height should not exceed 4 layers. Avoid prolonged compression and keep packaging tightly sealed to prevent powder caking and moisture absorption, which may affect fluidization performance.

(3) Due to the extremely high reaction activity of this product, the recommended storage period is within 3 months at 27°C. If used beyond the recommended storage period, performance verification should be conducted before application.

6. Applicable Application Process

Suitable for:

Electrostatic spraying

7. Application Areas

Widely used for corrosion protection of reinforcing steel structures in:

• Bridges
• Ports
• Airports
• Buildings
• Basements
• High-speed railway projects
• Other infrastructure construction projects.

If you're ready to take the next step, Leave your message below and we’ll reply soon. 20+ years of chemical manufacturing & export experience, a partner you can trust.