Powder Coating for Interior and Exterior Components of Rail Transit is a dedicated powder coating series developed for complex interior and exterior components used in rail transit systems. You can rely on this system to achieve stable appearance, good leveling, reliable corrosion protection, and compliance with fire and smoke safety requirements essential for rail applications.
You can apply this powder coating series to rail transit components with diverse structures and functional requirements, including:
Exterior body panels and structural components
Interior panels, frames, and decorative parts
Rail vehicle equipment housings and covers
Functional metal components requiring fire and smoke compliance
Tested and verified on:
0.8 mm degreased and derusted cold-rolled steel panels commonly used in rail vehicle manufacturing
Both interior-use and exterior-use component simulations under laboratory conditions
| Item | Specification |
|---|---|
| Product Type | Polyester (external parts) / Polyester–Epoxy Hybrid (internal parts) |
| Curing Conditions | 180 °C × 15 min or 200 °C × 10 min (metal temperature) |
| Application Method | High-voltage electrostatic spraying |
| Recommended Voltage | 40–90 kV |
| Atomizing Pressure | Approx. 0.7 bar |
| Primary Pressure | Approx. 0.7 bar |
| Recommended Film Thickness | 60–80 µm (test reference) |
| Secondary Rework | Sanding + air cleaning |
| Recoating Method | Reduced spraying voltage |
| Storage Conditions | Sealed container, dry and cool place below 30 °C |
| Shelf Life | 12 months |
| Item | Description |
|---|---|
| Chemical Types | Polyester for external parts; Polyester–Epoxy Hybrid for internal parts |
| Color Availability | External parts: customer-specified colors; Internal parts: metallic silver, woodgrain powder, white matt |
| Specific Gravity | 1.2–1.8 g/cm³ (depending on color) |
| Particle Size & Gloss | Varies by product type and color |
| Property | Test Standard | Performance Requirement |
|---|---|---|
| Adhesion | ISO 2409 / ASTM D3359 | Class 0 |
| Impact Resistance | ISO 6272 | 50 kg·cm (8 mm indenter) / 2.5 Nm (16 mm indenter) |
| Pencil Hardness | ASTM D3363 | ≥ 1H |
| Alkali Resistance | ISO 2812-1 | 0.1 N NaOH, 48 h, no defects |
| Acid Resistance | ISO 2812-1 | 0.1 N H₂SO₄, 24 h, no muddling |
| Salt Spray Resistance | ISO 7253 / ASTM B117 | ≥ 500 h, corrosion ≤ 2 mm |
| Damp-Heat Resistance | ISO 6270 | ≥ 500 h, slight discoloration only |
| Weathering Resistance | ISO 11341 (QUV-B313) | ≥ 500 h, Grade 3 or better |
| Water Resistance | ASTM D2247 | 20 cycles, no blistering |
| Flame Spread Index | ASTM E162 | Is ≤ 35 |
| Smoke Density | ASTM E662 | Ds(1.5) ≤ 100, Ds(4.0) ≤ 165 |
You achieve excellent leveling, supporting smooth and uniform surface appearance.
You benefit from strong UV and salt spray resistance for exterior rail components.
You obtain easy-cleaning performance that helps maintain interior aesthetics.
You can select different resin systems for interior and exterior applications to meet functional needs.
You meet fire and smoke safety requirements critical for rail transit environments.
We solved a compliance and durability challenge for a rail vehicle manufacturer.
The customer required a unified coating solution for both interior and exterior rail components. Their key challenges included meeting strict fire and smoke standards for interior parts while ensuring long-term weather resistance and easy cleaning for exterior panels.
We recommended using polyester-epoxy hybrid powder for interior components and polyester powder for exterior parts. By adjusting spraying voltage for complex geometries and optimizing curing conditions, the customer achieved stable adhesion, compliant fire performance, and consistent appearance across different component types. This helped streamline their coating process while meeting regulatory and durability requirements.
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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