SES N 3214 Plastic Color Standards

Developed by Suzuki Motor Corporation as part of its plastics and polymer material standards, the “SES N 3214 Plastics color standards” standard is an automotive material specification that defines how colors for plastic components within a vehicle program should be selected, measured, controlled, and approved. The aim of this standard is to ensure that all plastic parts used in a vehicle meet the following requirements:

• Matching the intended design color.
• Maintaining consistency between suppliers and parties.
• Meeting visual and functional requirements under real-world conditions.

This is very important because plastics can vary in color for the following reasons:

• Resin types: polypropylene (PP), acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polyamide (PA), etc.
• Additives (UV stabilizers, flame retardants)
• Processing conditions (temperature, cooling rate)

Color consistency is a critical quality attribute in modern automotive design. Plastic components, commonly used in both interior and exterior applications, must meet stringent color standards to ensure visual harmony, brand identity, and customer satisfaction.

The automotive industry is heavily reliant on polymer-based materials such as polypropylene, acrylonitrile butadiene styrene, polycarbonate, and polyamide. These materials are used in instrument panels, trims, bumpers, and various functional parts.

Unlike metals, plastics are quite susceptible to the following:

• Pigment distribution
• Processing conditions
• Additive interactions

Consequently, ensuring consistent color across parts, suppliers, and production batches requires well-defined standards and rigorous control systems.

Color standards are important for the following reasons:

• Aesthetic quality: Color is one of the first features perceived by customers. Even small differences between adjacent parts (e.g., instrument panel and door panel) can create a perception of low quality.
• Brand identity: Automotive manufacturers define specific color palettes that represent their brands. Consistency between models and production years is essential.
• Supplier integration: Vehicles are assembled from components manufactured by multiple suppliers. Color standards ensure all parts match, regardless of origin.

Color identification systems include the following:

• Key examples: Physical reference plates (certified samples) serve as the primary benchmark for color comparison.
• Color space systems: Color is quantitatively defined using the following system: CIELAB (L*, a*, b*). Here, L* represents lightness, a* the red-green axis, and b* the yellow-blue axis.
• Digital color data: Spectral data and digital color libraries are used for communication between original equipment manufacturers and suppliers.

Color measurement techniques include the following:

• Spectrophotometry: A spectrophotometer measures reflected light to determine color values ​​under standardized conditions.
• Light source (e.g., D65 daylight)
• Observer angle (2 degrees or 10 degrees)
• Color aberration: If this value is below 0,5, color aberration is imperceptible; between 0,5 and 1,0, it is slightly perceptible; and if it is at least 1,0, there is a visible difference. Tolerance limits vary depending on the location and visibility of the part.
• Visual assessment: Human assessment is still very important. Parts are examined under the following conditions:
• In multiple lighting conditions
• In assembled configurations

Factors that affect the color of plastic include:

• Material type: Different polymers affect pigment behavior: Semi-crystalline materials (e.g., PP) scatter light differently than amorphous plastics (e.g., PC).
• Additives: UV stabilizers, flame retardants, and fillers (e.g., fiberglass) can alter color tone and opacity.
• Processing conditions: Small variations in melting temperature, cooling rate, and injection speed may cause color tone differences.

Color perception is affected by the following:

• Gloss level (matte vs. high gloss)
• Surface texture (grain patterns resulting from molds)

The SES N 3214 standard generally applies to the following:

• Interior plastic parts (instrument panel, trim, brackets)
• Exterior plastic parts (bumpers, mirror housings)
• Painted and unpainted (colored by the main mixture) plastics

The SES N 3214 standard defines acceptable gloss ranges and texture characteristics to ensure a uniform appearance. According to this standard, plastic components should retain their color over time despite exposure to the following factors:

• Ultraviolet (UV) radiation
• Heat and thermal cycling
• Moisture and chemicals

The SES N 3214 standard defines the following test methods:

• Accelerated exposure to weathering conditions (e.g., xenon arc testing)
• Heat aging tests

According to this standard, manufacturers must provide the following:

• Same color in different production batches
• Stability over time (aging, UV exposure)

Color shift should be minimized in the following ways:

• Controlled pigment dosage
• Process repeatability

The color should remain stable after exposure to the following:

• UV radiation (sunlight)
• Heat cycles
• Gender

The SES N 3214 standard is compatible with broader material standards (for example, weather resistance tests used for plastics and coatings).

Without strict color standards,

• There may be visible discrepancies in the internal parts.
• Different suppliers produce inconsistent tones.
• The customer's perception of quality decreases.

In automotive design, when parts are placed side-by-side, even a color deviation difference of as little as 1% can be noticeable.

In conclusion, the SES N 3214 standard is a color control standard for automotive plastics that provides the following:

• Correct color definition
• Measurable consistency (color deviation limits)
• visual harmony between components
• Long-term resistance to environmental influences.

This standard is crucial for ensuring visual quality, brand consistency, and customer satisfaction in the automotive industry. Through a combination of precise measurement, controlled processes, and rigorous verification procedures, manufacturers can achieve consistent and durable color performance across complex vehicle systems.

For many years, our organization, with its competent and experienced team, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the SES N 3214 standard.