This product is formulated using epoxy resin and phenolic epoxy resin, designed and manufactured according to GB/T 23257-2009. It features high reactivity, strong adhesion, high cross-link density, and excellent resistance to chemicals, cathodic disbondment, and impact.
Suitable for anti-corrosion coatings on various oil and gas pipelines.
| Test Item | Technical Specification | Remarks |
|---|---|---|
| Appearance | Uniform color, no lumps | Visual inspection |
| Color | As per customer requirements | Color difference meter |
| Density (g/cm³) | 1.4–1.6 | GB/T 4472 |
| Particle Size Distribution | Residuals ≤3.0 at 150um, ≤0.2 at 250um | GB/T 6654 |
| Volatile Content (%) | ≤0.6 | GB/T 6654 |
| Gellation Time at 200°C (s) | ≥12 | GB/T 6654-1986 |
| Curing Time at 200°C (min) | ≤3 | GB/T 23257-2009 Appendix A |
| Test Item | Technical Specification | Remarks |
|---|---|---|
| Adhesion (Grade) | ≤2 | GB/T 23257-2009 Appendix C |
| Negative Electrode at 48h5°C (mm) | ≤8 | GB/T 23257-2009 Appendix D |
| Negative Electrode at 30±5°C (mm) | ≤15 | GB/T 23257-2009 Appendix D |
| Bending Resistance at -20°C, 2.5° | No cracks | GB/T 23257-2009 Appendix E |
| Parameter | Specification | Notes |
|---|---|---|
| Applicable Equipment | Frictional charging spray, corona electrostatic spray | |
| Film Thickness | 120-150um | Adjustable according to workpiece requirements |
| Property | Specification | Notes |
|---|---|---|
| Toxicity | Non-toxic | Safe for handling and application |
| Flammability | Non-flammable | Reduces risk in storage and use |
| Regulation | GB15607-1995 | Follow safety protocols for coating operations |
| Item | Specification | Notes |
|---|---|---|
| Mixing Powders | Do not mix with other types | |
| Outdoor Use | Not recommended | May cause fading and chalking |
| Surface Preparation | Oil-free, water-free, surface treatment to Sa21/2 level (GB/T8923), anchor pattern depth 40-100um, clean surface from dust and abrasives | |
| Storage | Ventilated, dry, below 30°C, away from heat sources, corrosive chemicals, and solvents, avoid strong light, maximum stack height 5 layers, keep packaging sealed | |
| Curing Temperature | Preheat steel pipe surface to above 190°C for better curing completion rate |
GB/T 23257-2009 “Polyethylene Anti-Corrosion Coating for Buried Steel Pipelines”
This comprehensive approach ensures that the product's quality and performance are maintained, while also providing clear guidelines for safe handling and application.
Powder coatings can be categorized by resin system (epoxy, polyester, hybrid, polyurethane), appearance (smooth, texture, hammer, metallic, pearlescent), or performance level (anti-corrosion, heat-resistant, UV-resistant, architectural grade, automotive grade).
Powder coatings offer thousands of colors in gloss, matte, satin, metallic, candy, texture, wrinkle, hammer tone, wood grain, fluorescent, and other custom effects. Special powders can create soft-touch, anti-scratch, anti-fingerprint, or anti-graffiti surfaces.
The process generally includes surface pretreatment (degreasing, phosphating, chromating, sandblasting), drying, electrostatic spraying, curing in an oven, and cooling. A well-controlled pretreatment and curing process ensures strong adhesion and long service life.
Powder coatings are environmentally friendly, solvent-free, and produce minimal waste. They offer excellent corrosion resistance, weather durability, mechanical strength, and uniform film appearance. The coating is tough, impact-resistant, scratch-resistant, and has a long lifespan.
Powder coatings are widely used in appliances, aluminum profiles, architectural components, automotive parts, bicycles, furniture, outdoor equipment, machinery, electrical cabinets, pipeline systems, and general industrial and consumer goods.
Powder coating is a dry finishing technology where finely ground powder is electrostatically sprayed onto a metal or non-metal surface and then cured at high temperature. After curing, the powder melts into a continuous, durable, and decorative coating layer.
Powder coating protects the substrate from corrosion, weathering, chemical attack, and mechanical wear. It also provides decorative appearance with rich colors, gloss levels, textures, and special effects.
In many industrial applications, powder coating outperforms liquid paint. It forms a thicker and tougher coating, resists corrosion and chemicals better, and does not contain VOCs. It also provides excellent consistency and cost-effective mass production.
It is called powder coating because the coating material is a solid powder instead of a liquid paint. The coating is formed by melting and curing powder particles under heat.
Powder coatings include several families depending on resin chemistry:
• Epoxy powders
• Polyester powders
• Epoxy-polyester hybrid powders
• Polyurethane powders
• Acrylic powders
• Fluorocarbon (PVDF) powders
Each type has its own performance features such as corrosion resistance, UV resistance, chemical resistance, outdoor durability, or decorative properties.
Powder coatings are based on thermoset or thermoplastic resins combined with pigments, curing agents, fillers, additives, and in some cases metallic or effect particles. Common substrates include steel, aluminum, galvanized metal, MDF, and certain heat-resistant plastics.
The lifespan depends on powder type, film thickness, application method, pretreatment, and service environment. Indoor coatings can last more than 10–20 years. High-grade outdoor polyester or fluorocarbon powders can last 15–25 years or longer under UV exposure.
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