1. Product Overview

This powder coating is a thermosetting pure epoxy powder coating specially designed for the internal corrosion protection of pipelines in the pipeline industry. It is applied to the preheated inner surface of steel products, where the powder melts, fuses, and cures to form a uniform and dense coating film.

The coating features excellent impact resistance, flexibility, and adhesion, effectively preventing corrosion caused by corrosive soils, hydrocarbons, chemicals, industrial wastewater, seawater, microorganisms, and other corrosive media. It is particularly suitable for forming smooth anti-corrosion coatings on the inner surfaces of pipelines or other irregularly shaped workpieces.

2. Main Technical Specifications

Curing Conditions

Curing Temperature	Curing Time
200℃	10 min
230℃	3.5 min

Powder Properties

Test Item	Test Method	Technical Specification
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 ≤ 3.0 250 μm ≤ 0.2
Gel Time (s)	GB/T 16995	≤ 180 (180℃) ≤ 120 (200℃) ≤ 60 (230℃)
Thermal Property ΔH (J/g)	SY/T 0442	≥ 45
Tg (℃)	SY/T 0442	≥ 95
Magnetic Material Content (%)	JB/T 6570	≤ 0.002

Coating Performance

Test Item	Test Method	Technical Specification
Appearance	Visual Inspection	Smooth surface, uniform color, no bubbles or cracks; slight orange peel texture is acceptable
Thermal Property |ΔTg| (℃)	SY/T 0442	≤ 5
Cathodic Disbondment after 24h or 48h (mm)	SY/T 0442	≤ 6.5
Adhesive Interface Porosity (Grade)	SY/T 0442	1-4
Cross-sectional Porosity (Grade)	SY/T 0442	1-3
Bending Resistance (3°)	SY/T 0442	No cracks in coating
Impact Strength (J)	SY/T 0442	≥ 8. no pinholes
Abrasion Resistance (1000g, 1000 cycles) (mg)	GB/T 1768	≤ 20
Adhesion Strength (Peeling Method) (Grade)	SY/T 0442	1~2
Adhesion Strength (Pull-off Method) (MPa)	GB/T 5210	≥ 20
Volume Resistivity (Ω·m)	GB/T 1410	≥ 1×10¹³
Dielectric Strength (MV/m)	GB/T 1408.1	≥ 30
Salt Spray Resistance (1000h)	GB/T 1771	No change in coating
Chemical Corrosion Resistance	GB/T 9274	Qualified after exposure to: 10% HCl (room temperature, 90 days) 10% H₂SO₄ (room temperature, 90 days) 3% NaCl (room temperature, 90 days) 10% NaOH (room temperature, 90 days)

3. Application Range

Internal coating of crude oil pipelines, refined oil pipelines, sewage pipelines, oilfield water injection pipelines, and drinking water pipelines.

(Certified by the Institute of Environmental Health Monitoring, Chinese Academy of Preventive Medicine, and approved for use on the inner walls of drinking water pipelines.)

Irregularly shaped components such as:

Flanged pipe fittings

Elbows

Valves

Pumps

Heating system accessories.

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 application and handling.

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℃. The storage period is 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℃, proper insulation and temperature-control measures should be taken during storage and transportation.