1. Product Overview

This product is a heavy-duty anti-corrosion modified epoxy powder coating. When applied to the surface of preheated and degassed steel springs, the powder melts, flows, and cures into a uniform and dense coating film after baking at a specified temperature and time.

The coating film provides excellent adhesion and effectively prevents corrosion caused by corrosive air, hydrocarbons, acids, alkalis, salts, microorganisms, wastewater, and exhaust gases.

It features outstanding toughness, fatigue resistance, and impact resistance. After 100.000 fatigue cycle tests, the coating shows no cracking, peeling, or detachment. The coating also demonstrates excellent impact resistance and fully passes the impact test at -40℃.

2. Main Technical Specifications

Curing Conditions

Curing Temperature	Curing Time
160~190℃	10~25 min

Powder Properties

Test Item	Test Method	Technical Specification
Appearance	Visual Inspection	Uniform powder appearance, no agglomeration or impurities
Density (g/cm³)	GB/T 4472	1.30-1.50
Non-volatile Content (%)	GB/T 6554	≥ 99.4%
Residue on Sieve (%)	180 mesh	≤ 0.5
Thermal Property ΔH (J/g)	SY/T 0442	≥ 45
Thermal Property Tg₂ (℃)	SY/T 0442	≥ 95
Gel Time (s)	GB/T 16995	170℃, 30~40s

Coating Performance

Test Item	Test Method	Technical Specification
Appearance	Visual Inspection	Smooth surface, no particles, shrinkage cavities, or pinholes
Coating Thickness (μm)	GB/T 1764	90~120
Gloss (60°) (%)	GB/T 9754	≥ 80
Impact Resistance (J)	GB/T 1732	≥ 4.9
Impact Resistance (kg·cm)	GB/T 1732	≥ 50
Bending Resistance (mm)	GB/T 6742	≤ 2
Pencil Hardness	GB/T 6739	1~2H
Cupping Test (mm)	GB/T 9753	≥ 7
Adhesion (Cross-cut Method) (Grade)	GB/T 9286	0
Chemical Corrosion Resistance	—	—
10% HCl (Room Temperature, 90d)	GB/T 1763	Qualified
10% H₂SO₄ (Room Temperature, 90d)	GB/T 1733	Qualified
10% NaCl (Room Temperature, 90d)	—	Qualified
10% NaOH (Room Temperature, 90d)	—	Qualified
Wastewater Immersion (Room Temperature, 90d)	—	Qualified
Neutral Salt Spray Resistance	GB/T 1771	500h, no change in coating
Humidity and Heat Resistance	GB/T 1740	1000h, no change in coating
Solvent Resistance	—	—
Diesel Fuel (Room Temperature, 90d)	GB/T 1763	Qualified
Gasoline (Room Temperature, 90d)	—	Qualified
Kerosene (Room Temperature, 90d)	GB/T 1763	Qualified

Surface Pretreatment

Recommended pretreatment methods:

Sand blasting

Cleaning and phosphating treatment

Application Method

This product is suitable for:

High-voltage electrostatic spraying

3. Application Range

Widely used for:

Automotive springs

Stabilizer bars

Other types of springs

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: 20 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.