Applying the UID 2-D Data Matrix to Your Product

One of the requirements for markings on parts for the Department of Defense (DoD) UID program is that the data matrix symbol can be applied in any of three ways---“so long as it remains permanent throughout the life of the item and is not damaged or destroyed in use.” Bensman, James. UID Journal Workbook. 1, 2008.

Acceptable methods for affixing the data matrix symbol include:

Embedded directly to the item
Engraved on a plate affixed to the item
Attached as a label

Three Common and Seven Less Common Viable Marking Methods

There are a variety of processes available to meet these application methods.

Commonly used direct mark processes include: electro-chemical, ink jet and laser etch.

Less commonly used but viable marking methods include: dot peen, metal stamp, engraving, electrical arc pencil, embossing, cast or forged (bumpy bar codes) and rubber stamp stencil.

What About Thermal Transfer Labels?

Thermal transfer label stock is commonly used for marking DoD parts and items. This typical black on white image affords high contrast for scanning and validation. An advantage to this method is its low entry cost. However, many labeling applications are not considered to be permanent throughout the life of the item. Before recommending this process for marking, carefully review the total application and requirements with the customer.

Which Marking Method Should We Recommend to Our Customer?

If the customer does not have a specified marking method for their application, take into consideration factors such as: permanency, material composition of the part, the manufacturing process, cost of the part and volume to help them identify the proper process and method. Permanency is a matter of how long and in what environment the image must last.

Most applications where thermal transfer labeling is acceptable occur in-house, used throughout a manufacturing/tracking process. More permanent methods of marking will be used in conjunction with thermal transfer labeling for life of the part after manufacturing. The labeling process gives the client the advantage of a high contrast symbol, low-entry cost to print (compared to the alternative methods), and is easier to read (scan & validate) due to higher quality images.

See our previous UID topic:

Do You Need To UID?: About the Unique Item Identification (UID) Standards

In a future article we will address the following UID topic:

How to scan 2-D bar codes to the standard ISO/IEC 154-15, and verification and grading of the symbol

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