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:

• 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

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

• 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.

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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