Plastic Marking

Plastic plays a central role in industry thanks to its unique combination of light weight, chemical resistance, insulating properties, and broad operating temperature range. This versatility explains its widespread use in demanding sectors such as automotive, aerospace, medical, electronics, and the food industry.

Plastics exhibit highly variable thermal and mechanical behaviours, which directly affect permanent marking results. Depending on the polymer type, formulation, and marking technology, the outcome may appear as darkening, whitening, surface modification, or slight relief. These effects result mainly from thermal or structural interaction with the material, rather than from material removal comparable to mechanical engraving.

The wide variety of plastic grades, along with the presence of additives, pigments, and fillers, strongly influences marking contrast and mechanical resistance. This variability requires careful adjustment of parameters and appropriate selection of technologies to ensure durable, legible marking that meets industrial requirements.

SIC MARKING provides several permanent marking solutions for industrial plastics, primarily laser marking and, in certain cases, dot peen marking for rigid and thick plastics.

Each plastic marking solution is selected according to the polymer type, rigidity, thermal sensitivity, and pigmentation, in order to ensure reliable and durable marking. Proper parameter adjustment is essential to avoid risks such as thermal deformation or material degradation.

Plastic laser marking machine: standalone laser station for serial marking of plastic parts, integrable laser heads for automated production lines and robotic cells requiring reliable traceability, and compact laser modules for semi-automatic stations. These systems are particularly suited to heat-sensitive plastics, with controlled energy input to limit the heat-affected zone and prevent deformation or alteration of mechanical properties.

Plastic dot peen marking machine: portable dot peen solution for specific applications on rigid and thick plastic parts where mechanical constraints allow it, standalone stations for low to medium repetitive production with adjustable impact energy to reduce the risk of deformation or cracking, and integrable heads for specific traceability cases on heavily filled plastics, mainly for alphanumeric marking and, in some cases, 2D codes on suitable materials.

Plastic scribing marking: scribing is generally not recommended for industrial plastics due to risks of tearing, cracking, and mechanical damage to the material.

Criteria for Selecting Plastic Marking Technology

The choice of a plastic marking technology is based on a combined analysis of polymer composition, hardness, thermal sensitivity, as well as the presence of pigments or additives and the final application of the part. Each of these factors must be considered to select the most appropriate marking method in line with functional, aesthetic, and durability requirements.

These criteria help determine whether laser marking is the most suitable solution or whether, in specific cases, dot peen marking can be considered. In all situations, priority must be given to readability and long-term marking performance.

The behaviour of plastics under marking is strongly influenced by their intrinsic variability. Polymer structure (amorphous or semi-crystalline), characteristic temperatures (Tm / Tg), and the presence of fillers or pigments all affect both laser absorption and heat dissipation. For example, amorphous plastics such as polystyrene (PS) generally respond more effectively to certain laser wavelengths, while semi-crystalline plastics such as polypropylene (PP) often require adapted parameters or additives to achieve sufficient contrast without excessive thermal accumulation.

Rigid plastics (ABS, PC, PA, POM) may, under controlled conditions, be suitable for dot peen marking when part geometry, thickness, and functional constraints allow it. However, precise adjustment of impact energy is essential to avoid material damage.

In contrast, soft or semi-soft plastics (PP, HDPE, TPE, TPU) are generally better suited to laser marking due to their low rigidity and sensitivity to mechanical stress. Laser processing enables non-contact marking, provided that energy input is carefully controlled to manage thermal effects.

Plastic Hardness and Rigidity

Thermal Sensitivity of Polymers

Impact of Pigments and Additives on Plastic Marking

The presence and type of pigments have a direct influence on the spectral absorption of the polymer and therefore on its response to laser marking.

Pigments and fillers play a key role in how the material reacts under laser exposure, affecting contrast, uniformity, and overall legibility of the marking.

In many cases, contrast is generated through foaming or micro-expansion of the polymer matrix under laser energy, resulting in a highly readable marking with minimal material removal.

By contrast, white or opaque plastics containing titanium dioxide (TiO₂) reflect a significant portion of infrared laser energy. This low absorption can, depending on process parameters, lead to surface browning or colour shifts, caused by uncontrolled local heating rather than a structured marking effect.

The uniformity of pigment and filler distribution is also critical to marking quality. Non-homogeneous dispersion can produce irregular results, with local variations in contrast that negatively affect readability and perceived quality. A consistent formulation is therefore essential to ensure stable marking performance.

Infrared laser marking can produce a clear, silver-white and highly legible result, particularly suited to codes, logos, and identification marking on automotive and industrial components. When properly controlled, this type of marking preserves the mechanical properties of the material, making it well suited for industrial traceability applications.

In contrast, plastics filled with TiO₂ or formulated with organic pigments behave differently under infrared laser exposure:

TiO₂ increases reflectivity of incident energy, which can reduce achievable contrast and lead to browning or colour changes at high energy density due to uneven surface heating.
Organic pigments tend to generate dark markings through localized thermal or chemical degradation, resulting in a contrast mechanism different from the foaming effect typically associated with carbon black.

Laser marking additives (LMA – Laser Marking Additives) are specialised fillers or masterbatches designed to improve absorption of infrared laser energy and promote controlled material behaviour such as foaming, controlled carbonisation, or whitening. Their use helps stabilise the material response and improves repeatability of results.

The integration of these additives typically reduces the energy required for marking by 20 to 60%, increases cycle speed, and enables the use of infrared lasers on low-reactivity polymers such as PP or PE, which would otherwise require tightly controlled parameters to achieve sufficient contrast.

Type of Marking on Plastic Parts

Permanent plastic marking includes DataMatrix codes, QR codes, barcodes, serial numbers, logos, and functional identifiers used for part identification, traceability, and regulatory compliance in industrial applications.

The selection of plastic marking technology—mainly laser marking, and in some cases dot peen marking—depends on the polymer type, required level of detail, and expected durability of the marking.

Laser marking is generally preferred for plastic due to its high precision, repeatability, and compatibility with industrial traceability systems. It enables clear and permanent marking on a wide range of rigid and semi-rigid plastics while maintaining the material’s mechanical properties, making it the reference solution for high-resolution applications requiring reliable machine readability.

Dot peen marking is reserved for rigid engineering plastics such as certain PC, PA, or highly filled polymers, when material thickness and mechanical constraints allow it. It is mainly used for simple alphanumeric codes and DataMatrix marking when engraving depth is a key requirement.

These plastic marking solutions ensure reliable traceability, compliance with standards, and long-term durability, even in demanding industrial environments. In sensitive medical or industrial contexts, the main objective is to guarantee readability without affecting part functionality.

The choice between DataMatrix DPM, QR codes, 1D barcodes, serial numbers, logos, or graduations depends on the required information density and automatic reading requirements. DataMatrix DPM codes are generally preferred for industrial traceability because they store a high amount of data in a very small area while ensuring robust reading performance with machine vision systems.

Laser marking is widely used in industrial plastic applications due to its flexibility, precision, and ability to adapt to complex geometries while delivering consistent and durable results.

In high-volume production, marking often combines a machine-readable code with human-readable information, such as a DataMatrix code paired with an 8 to 12-character alphanumeric identifier. Typical DataMatrix sizes on plastic vary from a few millimetres depending on the laser technology, achieved contrast, and industry requirements (automotive, medical, aerospace, logistics).

Materials > Plastic

Barcodes and QR Codes on Plastic Parts Serial Numbers Logos and Pictograms

plastic

Barcodes and QR Codes on Plastic Parts

Logos and pictograms require carefully controlled laser parameters to obtain a clear, consistent, and durable result. Fiber laser marking is typically preferred for its precision and repeatability, particularly on materials such as ABS or PC, which enable finely detailed and visually well-defined markings that meet industrial requirements.

Contrast levels and surface modification settings are adjusted according to regulatory constraints (such as CE marking or safety symbols) and aesthetic expectations, especially when parts are painted or surface-treated. The marking must remain legible over time without affecting the visual appearance or functional performance of the component.

For applications such as dashboards or electronic housings, the selected marking is generally non-invasive while still offering sufficient resistance to operational stresses. These markings are typically validated through abrasion, chemical resistance, and thermal cycling tests, in line with requirements from the automotive, appliance, and sports equipment industries.

The selection of a plastic marking solution is based on several key criteria:

Material criteria: polymer compatibility (ABS, PC, PA, POM versus PP or PET) determines laser interaction and achievable contrast levels.
Reading criteria: DataMatrix or QR codes are preferred for traceability and automated reading, while 1D codes or alphanumeric markings are used for simpler identification needs.
Aesthetic criteria: laser marking is favoured for producing precise, uniform, and repeatable results, particularly when appearance is a functional or branding requirement.
Durability criteria: for plastics, marking longevity mainly depends on the compatibility between the material, laser technology, and process parameters. Impact-based technologies are reserved for specific cases involving rigid and thick plastics, and are not typically used for aesthetic or standard traceability applications.

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fabricant de solution de marquage plastique

plastic

Serial Numbers

Alphanumeric serial numbers are used to provide unique identification and traceability for plastic products. They enable accurate tracking of each component throughout its lifecycle, from manufacturing and assembly to maintenance and end use, by creating a reliable connection with production data.

Character strings ranging from 6 to 12 characters are commonly adopted to achieve an effective balance between readability, marking size, and identification capacity. This format offers sufficient traceability while remaining compatible with the dimensional constraints of plastic parts.

Fiber laser marking is widely employed in high-volume production because of its precision, speed, and repeatability. On suitable plastics, it produces permanent contactless markings while preserving the mechanical integrity of the part, making it particularly well suited to automated manufacturing environments.

In the automotive industry, serial numbers play an important role in warranty management, recall processes, and product compliance. Each identifier is associated with a database containing information such as production batch, manufacturing date, or assembly station, enabling rapid access to traceability data and strengthening process control.

High-speed optical inspection systems are used to verify both the presence and readability of markings directly on the production line. Depending on the marking complexity and process conditions, these systems can inspect several hundred parts per minute, ensuring compliance with quality standards and immediate compatibility with automated reading systems and production tracking tools.

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plastic

Logos and Pictograms

Logos and pictograms require precise laser beam settings to achieve a clear and durable result. Fiber laser marking is preferred for its precision and premium appearance, particularly on materials like ABS and PC, which allow finely detailed and visually distinct markings.

Depth and contrast parameters are adjusted considering regulatory requirements (e.g., CE marking, safety symbols) and the desired aesthetics, especially when the plastic part is painted or surface-treated. It is crucial that the marking not only complies with standards but also suits the part’s aesthetic finish to ensure legibility and marking longevity.

On components such as dashboards or electronic enclosures, the selected marking is generally non-invasive while providing sufficient resistance to environmental conditions.

These markings are validated through abrasion, solvent, and thermal cycle tests, specific to sectors such as automotive, appliances, or sporting equipment.

The choice of plastic part marking is based on several complementary criteria:

Material criterion: compatibility of materials such as ABS / PC versus PET / PP, determining the selection of the appropriate laser technology.

Reading criterion: DataMatrix or QR codes for high traceability, while 1D codes are used for simpler logistics or identification needs.

Aesthetic criterion: Laser marking is preferred for visible and precise results, especially for applications where visual appearance is critical.

Durability criterion: Micro-percussion is preferred when marking depth and longevity are priorities, providing increased resistance to harsh conditions.

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Applications by Industrial Sector

In many industries, marking plastic parts has evolved beyond simple visual identification and now plays a key role in product traceability and information management. By linking a DataMatrix or QR code to a dedicated database, manufacturers can maintain access to essential information throughout the entire lifecycle of the part, including production records, batch identification, quality data, and operator information.

Permanent marking is also an important element in meeting regulatory and industry-specific requirements. It supports compliance with UDI regulations in the medical field, DataMatrix identification standards used in aerospace applications, and traceability specifications imposed by automotive manufacturers, including for components operating in demanding environments.

In addition, permanent marking contributes to greater efficiency across logistics and operations. Readable machine codes simplify inventory management, help minimize picking mistakes, and facilitate maintenance activities and product tracking throughout the service life of the part, whether in warehouses or at customer facilities.

Sectors > Plastic

Automotive Aerospace Medical Logistics and Industry

Automotive

Marking of reusable plastic bins (HDPE, PP): laser marking of DataMatrix codes and barcodes used for rotation tracking and identification in logistics operations. High-density polyethylene (HDPE) and polypropylene (PP) are commonly used for reusable containers exposed to repeated cleaning and washing cycles. When parameters are properly adjusted to account for the low thermal absorption of these materials, laser marking provides durable and easily readable identification compatible with industrial operating conditions.

Rigid plastic parts marking (ABS, PA, POM): dot peen marking of logos and serial numbers for long-lasting identification in workshop environments. ABS, polyamide (PA), and polyoxymethylene (POM) are frequently selected for rigid components requiring markings capable of withstanding handling and everyday industrial use.

Dot peen technology can be used when part thickness and functional constraints permit, providing durable and legible alphanumeric markings over time, particularly for applications where standardized automatic reading is not required.

marquage de pièce plastique du secteur aéronautique

Aerospace

Marking of technical plastic parts PEEK / reinforced PA: dot peen marking of serial numbers and regulatory identifiers to ensure strong thermal and mechanical resistance. These engineering plastics, such as PEEK and reinforced polyamide (PA), require a marking method capable of maintaining durability under demanding operating conditions. Dot peen marking is well suited to these materials due to their rigidity, allowing deep and permanent identification.

Marking of high-performance PA and PEI connectors: laser marking of DataMatrix ECC200 codes to ensure traceability and compliance with aerospace standards. High-performance polymers such as PA and PEI require a precise marking process capable of delivering high resolution and stable readability under extreme temperature and environmental conditions. Laser marking provides high-contrast 2D codes on small or complex geometries while remaining compatible with automated reading systems.

Marking of maintenance tooling in thick ABS and PA: dot peen marking of 2D codes for long-term identification. Thick ABS and PA components used in industrial environments require markings that can withstand mechanical stress, abrasion, and harsh working conditions. Dot peen marking produces deep impressions that maintain readability over time, ensuring reliable traceability in service operations.

Marking of high-performance PA and PEI connectors: laser marking of DataMatrix codes to meet industrial traceability requirements, particularly in aerospace and advanced engineering sectors. These materials demand stable and accurate identification that remains legible under thermal and environmental stress. Laser technology enables fine, high-contrast markings suitable for complex surfaces and automated inspection systems.

marquage de pièce plastique pour le secteur médical

Medical

Marking of medical devices and housings (Medical ABS / PEI): laser marking of UDI codes and serial numbers to ensure MDR/FDA compliance and patient traceability. Medical-grade ABS and PEI are used in devices that must withstand demanding operating and sterilisation conditions. Laser marking provides durable identification and supports regulatory compliance while ensuring consistent traceability throughout the product lifecycle.

Marking of laboratory trays and racks (PP, PET): laser marking of permanent DataMatrix codes and internal identifiers for tracking after cleaning cycles. Polypropylene (PP) and polyethylene terephthalate (PET) are widely used for laboratory consumables exposed to frequent washing and decontamination. Laser marking ensures reliable readability and traceability even after multiple cleaning cycles, meeting laboratory durability requirements.

Marking of reusable plastic instruments (PSU, PEEK): laser marking of functional identifiers to ensure resistance to sterilisation processes. PSU and PEEK are commonly used for reusable instruments requiring high thermal and mechanical stability, making laser marking the preferred solution to guarantee durable and legible identification after repeated sterilisation cycles.

Logistics and Industry

Marking of rigid plastic parts (ABS / PA / POM): dot peen marking of logos and serial numbers for robust identification in workshop environments. ABS, PA (polyamide), and POM (polyoxymethylene) are commonly used for rigid components that require deep, wear-resistant marking. Dot peen technology enables durable identification that withstands handling, friction, and industrial workshop conditions while ensuring long-term readability.

Marking of reusable plastic bins (HDPE, PP): laser marking of DataMatrix codes and barcodes for rotation tracking and durable identification during washing cycles. HDPE (high-density polyethylene) and PP (polypropylene) are widely used for reusable containers that require reliable traceability and resistance to repeated cleaning processes. Laser marking provides permanent and legible identification that remains stable throughout the service life of the bins, even after multiple washing cycles.

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