Powder Coating for Interior and Exterior Components of Rail Transit
Powder Coating for Interior and Exterior Components of Rail Transitis 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.
Application
You can apply this powder coating series to rail transit components with diverse structures and functional requirements, including:
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Exterior body panels and structural components
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Interior panels, frames, and decorative parts
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Rail vehicle equipment housings and covers
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Functional metal components requiring fire and smoke compliance
Tested and verified on:
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0.8 mm degreased and derusted cold-rolled steel panels commonly used in rail vehicle manufacturing
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Both interior-use and exterior-use component simulations under laboratory conditions
Parameters
| 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 |
Powder Characteristics
| 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 |
Coating Performance (Reference Data)
| 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 |
Features
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You achieve excellent leveling, supporting smooth and uniform surface appearance.
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You benefit from strong UV and salt spray resistance for exterior rail components.
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You obtain easy-cleaning performance that helps maintain interior aesthetics.
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You can select different resin systems for interior and exterior applications to meet functional needs.
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You meet fire and smoke safety requirements critical for rail transit environments.
Case
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.
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