1. Product Overview

This series of powder coatings is a thermosetting pure epoxy heavy-duty anti-corrosion powder coating. When applied to the surface of preheated steel products, the powder melts, fuses, and cures to form a uniform and dense coating film, effectively preventing corrosion caused by corrosive substances.

The coating features excellent toughness, abrasion resistance, and impact resistance. It suffers minimal damage during transportation and underground installation, and can withstand soil stress and impact during backfilling. It has excellent flexibility and bending resistance.

The coating provides excellent coverage and adhesion on weld seams, irregularly shaped workpieces, and steel reinforcement bars. It is especially suitable for the coating of long-distance transmission pipelines and construction steel reinforcement. It is a heavy-duty anti-corrosion powder coating featuring convenient application, rapid curing, and outstanding performance.

2. Main Technical Specifications

Curing Conditions

Curing Temperature	Curing Time
230℃	1~3 min

Note:

When EPY2-II powder coating is applied to preheated workpieces, it utilizes the residual heat of the substrate for curing, and generally does not require additional post-curing heating. However, for thin-wall pipes or applications under extremely low ambient temperatures, additional heating may be required to complete the curing process.

Powder Properties

Test Item	Test Method	Technical Specification
Appearance	Visual Inspection	Uniform color, no agglomeration
Curing Time (230℃ ± 3℃) (min)	SY/T 0315	≤ 2. and within the specified range
Density (g/cm³)	GB/T 4472	1.30-1.50
Non-volatile Content (%)	GB/T 6554	≥ 99.4%
Particle Size and Distribution (%)	GB/T 6554	150 μm ≤ 0.2 250 μm ≤ 3.0
Gel Time (230℃ ± 3℃) (s)	GB/T 6554	≤ 30
Thermal Property ΔH (J/g)	SY/T 0315	≥ 45
Tg (℃)	SY/T 0315	≥ Maximum Service Temperature + 40
Magnetic Material Content (%)	GB/T 6570	≤ 0.002

Coating Performance

Test Item	Test Method	Technical Specification
Appearance	Visual Inspection	Smooth surface, uniform color, no bubbles, cracks, or shrinkage cavities; slight orange peel texture is acceptable
Thermal Property ΔTg (℃)	SY/T 0315	≤ 5
Degree of Cure (%)	SY/T 0315	≥ 95
Cathodic Disbondment at 65℃, 48h (mm)	SY/T 0315	≤ 6.5
Cathodic Disbondment at 65℃, 28d (mm)	SY/T 0315	≤ 15
Bending Resistance (-30 ± 3℃) (3°)	SY/T 0315	No cracks after bending
Impact Resistance (-30 ± 3℃) (1.5J)	SY/T 0315	No holidays
Cross-sectional Porosity (Grade)	SY/T 0315	1~4
Adhesive Interface Porosity (Grade)	SY/T 0315	1~4
Adhesion Strength (24h) (Grade)	SY/T 0315	1~3
Adhesion Strength (28d) (Grade)	SY/T 0315	1~3
Dielectric Strength (MV/m)	GB/T 1408.1	≥ 30
Corrosion Resistance (Sand Abrasion Method) L/μm	SY/T 0315	≥ 3
Volume Resistivity (Ω·m)	GB/T 1410	≥ 1×10¹³
Cathodic Disbondment Resistance After Bending (28d)	SY/T 0315	No cracks at 2.5°
Chemical Medium Corrosion Resistance	SY/T 0315	Qualified

3. Application Range

Internal and external surfaces of long-distance transmission pipelines.

Pipe fittings and irregular components, including:

Flanged pipe fittings

Elbows

Valves

Pumps

Internal and external surfaces of containers for corrosive liquid chemical products.

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 and temperature-control measures should be taken during storage and transportation.