All about direct marking and how to scan DPM marks
In today’s industrial and manufacturing landscape, there is a continually growing need for reliable identification and traceability of components and products. Direct Part Marking (DPM) has emerged as a critical technology for achieving these goals, offering durable marking solutions that enhance efficiency and enable seamless tracking throughout the product lifecycle.
What is DPM (Direct Part Marking)?
Direct Part Marking refers to the process of using a marking system for permanently marking a part or component with a unique identifier directly on its surface. Unlike traditional barcode labels or RFID tags, DPM involves using direct marking machines for marking methods such as dot peen that engrave, etch, laser, or otherwise inscribe information directly onto the part itself. Common direct marking techniques include laser marking, dot peening, laser engraving, chemical etching, and inkjet printing designed for durability and readability under various conditions. These DPM marks can be read by special scanners, similar to barcode scanning.
Why is DPM used instead of typical barcodes?
Direct Part Marking offers several advantages over traditional barcode labels:
Durability: DPM marks are resistant to wear, abrasion, and an abusive harsh environment, ensuring permanent identification.
Space Constraints: In applications where space is limited or where labels may not adhere well, DPM provides a small yet permanent marking solution.
Traceability: A direct part mark enables reliable part identification throughout the product lifecycle, supporting quality control, maintenance, and regulatory compliance.
In short, a bar code applied with an adhesive label may not be a durable choice for very small parts and/or items which are subject to wear and tear. Direct marking is a more permanent solution which also has the advantage of being readable at a very small size.
Industries and Applications where Direct Part Marking is utilized
Direct marking (also known as laser marking technology or dot peen marking) finds extensive use across diverse industries where traceability, safety, and quality assurance are critical:
Automotive: Used for automotive part identification, traceability in assembly processes, and counterfeit prevention.
Aerospace: Ensures compliance with stringent safety regulations, facilitates maintenance and component tracking.
Medical Devices: Supports tracking of components for quality control, recalls, and regulatory compliance.
Electronics: Enables tracking of components and products through manufacturing and distribution processes.
Defense: Essential for parts identification, maintenance tracking, and ensuring supply chain security.
Consumer Goods: Used in anti-counterfeiting measures and for tracking products through distribution channels.
Special considerations for scanning technology to read DPM marks
DPM marks can’t be read with a typical barcode scanner. Reading a direct part mark requires specialized barcode reader technologies capable of interpreting marks that may vary in depth, material, and surface finish. Key considerations for this type of marking method include:
Imaging Technology: Scanners equipped with high-resolution cameras or sensors capable of capturing fine details and contrast differences in marked surfaces.
Lighting: Adequate lighting is crucial for enhancing contrast and visibility of marks, especially on reflective or uneven surfaces.
Software Algorithms: Advanced decoding algorithms designed to interpret marks that may be distorted or partially obscured due to surface irregularities.
Verification Standards: Compliance with ISO standards (like ISO 15415 for 2D barcode symbols) ensures that scanners can reliably read and verify DPM marks.
Specialized Scanners for Capturing DPM Marks
CSSI is a specialist in data capture technologies such as barcodes, RFID, and direct part marking. We have available a number of solutions capable of scanning a DPM barcode or symbol. The right solution will depend on your particular needs – we can work with you to select the right product. Several of the available DPM scanning options include:
Direct Part Marking (DPM) plays a pivotal role in modern manufacturing and industrial processes, offering durable and reliable identification solutions that enhance traceability, quality control, and regulatory compliance across various sectors. Contact CSSI to discuss your DPM application and barcode scanner applications, and we will help you select and test a DPM code capture product to meet your requirements.
FAQ – Frequently Asked Questions About Direct Part Marking
Q: What is direct part marking, and how is it different from a printed label? A. Direct part marking (DPM) is the process of permanently marking an identification code — usually a 2D Data Matrix code — directly onto a physical part, rather than applying an adhesive barcode label. Because the code is etched, engraved, or otherwise formed into the part itself, it stays with that part for its entire lifecycle, even through harsh handling, cleaning, heat, or chemical exposure that would destroy a paper or film label. This makes DPM the preferred approach anywhere traceability has to survive the full life of the component, not just the trip through the warehouse.
Q: What marking methods are used to create DPM codes? A. Common methods include laser printing/etching, dot peening (a pin or stylus that indents a pattern of dots into the surface), chemical/electrochemical etching, and abrasive blasting. The right method depends on the part’s material, surface finish, and the environment it will operate in — for example, laser marking is common on metals and plastics that need a fine, permanent mark without changing the part’s structural integrity, while dot peening is widely used on cast or machined metal components in automotive and heavy manufacturing.
Q: Why are DPM codes harder to scan than standard barcodes? A. DPM codes lack the high, consistent black-on-white contrast that flat printed labels provide, since the mark and the part are often the same material and color. Reading is further complicated by curved or uneven part surfaces, reflective or polished metal finishes that cause glare, and variation in mark depth or dot pattern depending on the marking method used. These factors mean a DPM code that looks perfectly readable to the eye can still be difficult for a scanner to decode reliably.
Q: What kind of equipment does a business need to read DPM codes? A. Standard laser or basic imaging barcode scanners generally aren’t sufficient. Reading DPM codes reliably requires advanced image-based readers purpose-built for low-contrast, high-glare marks — these use specialized lighting angles and image processing to pull the code pattern out of a difficult surface. Fixed-mount industrial readers designed specifically for DPM applications (such as Cognex’s DataMan 370 and DataMan 8050 series) are typically used on production and inspection lines where parts need to be scanned automatically and consistently.
Q: Which industries rely on direct part marking, and why does it matter for their operations? A. DPM is especially common in aerospace, automotive, and electronics manufacturing (including components like cell phone parts), where traceability is tied directly to safety, warranty claims, and the ability to isolate and recall faulty parts. For these industries, a permanent, tamper-resistant mark that survives assembly, use, and maintenance is essential to maintaining an accurate chain of custody for every individual part, not just the batch or lot it came from.
