SES N 3220 Method for Marking Material Symbols for Polymeric Material Parts

Developed by Suzuki Motor Corporation under polymer identification/marking standards, the “SES N 3220 Method of Marking Material Symbols for Polymeric Material Parts” standard is an automotive standard that defines how polymeric (plastic and elastomer) parts should be marked with material identification symbols. These markings help to determine the material composition of the parts throughout their entire lifecycle, from production to recycling. This standard is compatible with internationally accepted material marking systems such as ISO standards (e.g., ISO 11469 and ISO 1043 series).

The primary objectives of the SES N 3220 standard are as follows:

To ensure clear and consistent identification of polymer materials.
To support efficient recycling and waste management.
Improving traceability in production and quality control.
To simplify the selection of materials for repair and replacement.

The SES N 3220 standard applies to the following:

Thermoplastics (e.g., PP, ABS, and PA)
Thermoset plastics
Elastomers and rubber materials
Composite polymer materials used in automotive components.

This standard covers all plastic parts used in vehicles, especially those above a certain weight or size threshold where marking is possible.

The material marking system has been defined as follows:

Standardized symbols: Materials are identified using internationally accepted abbreviations:
PP: Polypropylene
ABS: Acrylonitrile butadiene styrene
PA: Polyamide (nylon)
PC: Polycarbonate

These symbols comply with the rules defined by ISO standards.

Composite materials: Marking for reinforced or filled materials includes additional identifiers:
PP-GF30: Polypropylene containing 30% glass fiber.
PA6-GF15: Polyamide 6 containing 15% glass fiber.
Multi-material parts: If a part is composed of more than one material,
Each item must be labeled individually or
The dominant material should be clearly stated.

The marking requirements have been defined as follows:

Location:
The signs should be placed in a visible but non-functional area.
It should not affect the performance or aesthetics of the piece.
Size and readability:
The text should be legible and durable.
The minimum character height is usually specified (e.g., at least 2,5 mm depending on the part size).
Marking method: Common marking techniques include:
Placement into mold (preferred)
Laser engraving
relief or carving

The SESN 3220 standard includes the following specific considerations:

Recycled materials:
Recycled content may be indicated where necessary.
It helps in monitoring sustainability metrics.
Painted or coated parts:
The markings must remain identifiable even after coating.
It may require deeper embossing or protected placement.
Safety-critical components:
Additional traceability markings beyond material symbols may be required.

In the automotive industry, the importance of the SES N 3220 standard extends far beyond simple labeling. This standard directly impacts production quality, environmental compliance, and vehicle lifecycle management. It is considered essential for the following reasons:

Ensures efficient recycling and sustainability: Modern vehicles contain large amounts of plastic. Correct material labeling:
It enables the rapid identification and separation of plastics during disassembly.
It supports compliance with regulations such as the end-of-life vehicles directive.
It reduces landfill waste and promotes circular economy practices.
It prevents material mixing in production: Automotive manufacturing involves hundreds of types of polymers. This standard ensures the following:
Operators can visually verify the types of materials.
It reduces the risk of using the wrong type of plastic.
It helps maintain consistent product quality.
Improves quality control and traceability: Material markings serve as a permanent identifier for parts.
Engineers can trace defects back to specific material types.
It supports root cause analysis in malfunctions.
It helps during audits and supplier evaluations.
It supports repair and maintenance: During vehicle servicing,
Technicians can determine the correct materials for repair methods (e.g., welding, gluing).
It ensures the compatibility of spare parts.
It prevents incorrect repairs that could weaken the components.
It facilitates global standardization: This standard is compatible with international systems such as ISO standards. In this way,
Suppliers in different countries use the same marking language.
It simplifies global supply chains.
It reduces communication problems between original equipment manufacturers and suppliers.
It increases cost efficiency: Standardized labeling reduces costs in the following ways:
It minimizes production errors and scrap amounts.
It speeds up the sorting process in recycling facilities.
It reduces the time spent on material identification.
Supports regulatory and environmental compliance: Automotive companies are required to comply with strict environmental and materials regulations.

In conclusion, the SES N 3220 standard plays a crucial role in ensuring clear and consistent identification of polymeric materials used in automotive parts. By standardizing marking methods, this standard supports environmental sustainability goals while enhancing recyclability, traceability, and production efficiency.

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 3220 standard.