1. UID labeling involves many steps:
From design to IUID verification
Department of Defense contractors have many details to think about when determining how to
comply with the department’s Item Unique Identification (IUID) requirements. The IUID program
involves the marking of individual pieces of equipment with a Unique Identification (UID) that stays
with the item throughout its life. The marking is accomplished using a 2D Data Matrix symbol that is
read with an automated scanner.
Decisions to be made include how the UID labels will be applied to the item; where the labels will be
located; and the size of the mark. Finally, IUID verification is needed to ensure the symbol is of high
quality and will be readily readable and in the proper syntax.
According to DoD standards, the Data Matrix symbol should remain readable throughout the life of
the item; withstand environmental conditions the item may encounter; and not harm the
performance, durability or reliability of the item.
The latter concern may come up when one is deciding which labeling method to use. There are two
methods of applying UID labels: Direct and indirect marking. Direct marking methods include dot
peening, laser marking, electrochemical etching, and engraving. While these marks are durable, care
must be taken that the marking process does not damage the equipment or affect its performance.
In some cases, metallurgical testing may be required before the marking method is approved.
Indirect labeling methods involve applying the Data Matrix symbol to a tag — made of a durable
material — which is then securely attached to the item to be labeled. This method is often less
expensive than direct labeling. The method of attachment also needs to be evaluated to be sure the
label will remain on the item throughout its life. Light, heat and corrosion can weaken the
attachment over time.
Where to place the UID labels is another issue to address. Ideally, the label will be readable both
when the item is in use and when it is in storage. Applying the label to a flat, rather than curved,
surface is preferable. If possible, avoid placing the label over an air vent or sensor, near a heat
source, or on a component that may be replaced during maintenance.
A crucial step in the UID process is IUID verification. Hardware and software are used to evaluate
the UID labels on several parameters related to its readability and overall syntax.It may be wise to
consult with UID labeling experts such as ID Integration, Inc. (www.id-integration.com).