1. Product Overview

This product is formulated and manufactured using novolac epoxy resin according to GB/T 23257-2009. It features high reaction activity, strong coating adhesion, and high cross-linking density. The cured coating film provides excellent adhesion, chemical resistance, cathodic disbondment resistance, and impact resistance, offering reliable long-term corrosion protection for pipeline applications.

2. Product Features

(1) Excellent bonding strength with the substrate.

(2) Provides appropriate softening time and excellent interfacial properties, allowing easy melting and bonding with the intermediate adhesive layer, forming an integrated coating system after curing.

(3) Provides effective protection over a wide temperature range with long-term anticorrosion performance.

(4) The coating has excellent high-temperature resistance to cathodic disbondment.

(5) Large powder spraying coverage area and high powder utilization rate.

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

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)	1.3–1.5	GB/T 4472
Particle Size Distribution (%)	Powder retained on 150 μm sieve <3	GB/T 6554
	Powder retained on 250 μm sieve <0.2	GB/T 6554
Volatile Content (%)	<0.6	GB/T 6554
Softening Time at 200°C (s)	>12	GB/T 6554-1986
Curing Time at 200°C (min)	<3	Appendix A of GB/T 23257-2009
Thermal Performance	ΔH/(J/g) ≥45	Appendix B of GB/T 23257-2009
	Tg₂ ≥95°C	Appendix B of GB/T 23257-2009

4. Performance Parameters of Cured Powder Coating Film

No.	Test Item	Technical Requirements	Test Method
1	Adhesion (Grade)	≤2	Appendix C of GB/T 23257-2009
2	Cathodic Disbondment Resistance (65°C, 48 h) (mm)	≤8	Appendix D of GB/T 23257-2009
3	Cathodic Disbondment Resistance (65°C, 30 days) (mm)	≤15	Appendix D of GB/T 23257-2009
4	Flexural Resistance (-20°C, 2.5°)	No cracks	Appendix E of GB/T 23257-2009

Applicable Standard: GB/T 23257-2009

5. Precautions

(1) The steel pipe surface must be free from oil contamination and moisture. Surface preparation quality should reach Sa2½ grade (GB/T 8923). The recommended anchor profile depth is 50–90 μm. Dust and abrasive residues attached to the steel pipe surface must be completely removed by air blowing.

(2) The product should be stored indoors in a well-ventilated and dry environment at temperatures below 30°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 ensure that packaging remains sealed to prevent powder caking and moisture absorption, which may affect fluidization performance.

(3) To ensure complete curing of the epoxy coating film and achieve optimal anticorrosion performance, it is recommended that the steel pipe surface temperature be preheated to above 170°C, which helps improve the curing completion rate.

6. Applicable Application Process

Suitable for:

Electrostatic spraying

7. Application Areas

Used as an anticorrosion coating for various pipelines, including:

• Oil transportation pipelines
• Gas transmission pipelines
• Other pipeline systems requiring corrosion protection.