Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
CAN/CSA-ISO/IEC 15459-3:07 – Unique Identification for Returnable Transport Items (RTIs)
Technical Overview of the Common Rules for Assigning Unique Identifiers to Returnable Transport Items
Scope and Applicability
CAN/CSA-ISO/IEC 15459-3:07 is the Canadian adoption of the international standard ISO/IEC 15459-3:2007, which specifies the common rules for creating and managing unique identifiers for returnable transport items (RTIs). RTIs include pallets, containers, bins, kegs, and other reusable packaging used repeatedly in supply chains to transport goods. The standard addresses the need for a globally unambiguous identification scheme that ensures each RTI can be uniquely recognized across different organizations, geographic regions, and industry sectors.
The core objective of this standard is to provide an identification framework that eliminates duplication and confusion when multiple parties handle the same physical asset. By adhering to the rules set forth in CAN/CSA-ISO/IEC 15459-3:07, organizations can enable efficient tracking, reduce loss, improve utilization, and support automated data capture through barcodes or RFID tags.
The standard is designed for use by manufacturers, logistics providers, retailers, and any entity that owns or manages RTIs. It complements other parts of the ISO/IEC 15459 series, such as Part 1 (individual items), Part 2 (returnable items), and Part 4 (unique identifiers for supply chain management). Notably, Part 3 focuses specifically on common rules that apply across all RTI identification scenarios, ensuring consistency with other identification systems.
Key Application: CAN/CSA-ISO/IEC 15459-3:07 is frequently used in closed-loop pooling systems (e.g., pallet pools) as well as open-loop supply chains where RTIs move across company boundaries.
Technical Requirements
Structure and Construction of the Unique Identifier
The standard defines the unique identifier for an RTI as a string of alpha-numeric characters with a fixed maximum length. The identifier comprises the following mandatory elements:
- Issuing Agency Code (IAC): A code assigned by the registration authority (e.g., GS1, the civilian registration authority for this standard) that identifies the organization that issued the identifier.
- Individual Asset Reference: A unique serial number or reference assigned by the issuing agency’s member organization to the specific RTI.
- Check Digit (optional but recommended): A calculation character used to verify the integrity of the identifier during data entry or reading.
The overall length of the identifier is limited to 50 characters. Allowed characters are A–Z, a–z, 0–9, and a defined set of special characters (e.g., hyphen, period). The IAC is centrally allocated, while the asset reference is under the governance of the member organization.
| Field | Description | Length (characters) | Example |
|---|---|---|---|
| Issuing Agency Code (IAC) | Identifies the body controlling the identifier scheme | 3–4 | GS1 = D; others use numeric |
| Individual Asset Reference | Serial number assigned to the specific RTI | Up to 46 (combined with IAC <=50) | 1234567890ABC |
| Check Digit (optional) | Ensures correct reading | 1 | 5 |
| Total | ≤ 50 | D1234567890ABC5 |
Important Restriction: The identifier must be globally unique within the context of the IAC. Two different asset references from the same IAC must not collide. Cross-IAC uniqueness is managed by the registration authority.
Data Encoding and Carriers
CAN/CSA-ISO/IEC 15459-3:07 does not prescribe a specific data carrier (barcode symbology or RFID tag). Instead, it defines the data structure to be encoded. Common carriers include:
- Code 128 (linear barcode) – widely used for human-readable and scanned RTI identification.
- Data Matrix or QR Code – used when high-density encoding or direct part marking is required.
- UHF RFID (ISO/IEC 18000-6C) – used for automated, batch identification of RTIs.
The encoding must follow the rules of the chosen carrier, but the identifier content itself must comply with the structure defined in this standard.
Best Practice: Use a carrier that provides both human-readable and machine-readable representation of the unique identifier to support manual and automated processes.
Implementation Highlights
Registration of Issuing Agency Codes
To implement the standard, an organization must first obtain an IAC from the registration authority (currently GS1 or an authorized national member organization). Once obtained, the organization can assign unique asset references within its own scope. The standard also allows existing identification systems (e.g., GS1 Global Returnable Asset Identifier – GRAI) to be used, provided they follow the common rules.
Marking and Placement
The standard recommends that the identifier be permanently affixed to the RTI in a form that is durable throughout its expected life. Marking considerations include location (e.g., side of a pallet, top of a container), protection from abrasion and chemicals, and readability in various environmental conditions. For RFID, the tag should be encapsulated or positioned to avoid detuning by the RTI material (e.g., metal, liquids).
Data Management and Databases
Organizations should maintain a database that links each unique identifier to asset attributes such as type, owner, date of manufacture, inspection history, and current location. This standard does not mandate a specific database schema, but it facilitates interoperability by guaranteeing that identifiers are globally unique. The database can be internal or shared via a registry.
Implementation Tip: Consider adopting an asset management system that can parse the IAC and asset reference separately, enabling automated sorting and validation of incoming RTIs from multiple sources.
Interoperability with Other Standards
CAN/CSA-ISO/IEC 15459-3:07 is aligned with ISO/IEC 15459-2 (registration procedures) and ISO/IEC 15459-4 (unique identifiers for supply chain management). It also supports the GS1 Global Returnable Asset Identifier (GRAI) standard under the GS1 system. The common rules ensure that identifiers generated under different schemes do not conflict.
Compliance and Certification Notes
Conformity Assessment
Organizations wishing to claim compliance with CAN/CSA-ISO/IEC 15459-3:07 must ensure that their identifier structure and assignment procedures meet the requirements of the standard. A key element is the use of a valid, registered IAC. Additionally, the identifier must be unique for the intended lifetime of the RTI (at least until the item is decommissioned).
Testing and Validation
Conformance testing can be performed by the issuing agency or an accredited third-party test house. For barcodes and RFID, additional tests for print quality, symbol contrast, modulation, and minimum reflectance (ISO/IEC 15416 for barcodes; ISO/IEC 18046 for RFID) are recommended to ensure readability. The standard itself does not mandate a specific print quality grade, but industry practice often calls for a minimum ISO/IEC 15416 grade of 2.5/06/100.
Non‑Compliance Warning: Failure to use a properly registered IAC or allowing duplicate asset references within the same IAC scope violates the core principle of global uniqueness and can lead to data errors, asset loss, and trade partner rejection.
Documentation and Traceability
Compliant implementations should maintain records of the IAC authorization, the range of asset references assigned, and the dates of assignment. This documentation may be required for audits or supply chain partner verification. The standard also recommends that RTI owners provide a way for other parties to look up the identifier’s issuer (e.g., via an online portal).
Updates and Transition
While CAN/CSA-ISO/IEC 15459-3:07 reflects the 2007 version, users should monitor for later editions (e.g., ISO/IEC 15459-3:2011, 2014) and any corresponding Canadian adoption. Transition periods are usually granted to allow existing marked assets to remain in circulation while new identification follows the updated rules.
Q: Who can assign an IAC under CAN/CSA-ISO/IEC 15459-3:07?
A: The registration authority (currently GS1) allocates IACs to member organizations, which can be manufacturers, pooling companies, or any entity that owns or manages RTIs. These organizations then assign individual asset references to their RTIs.
A: The registration authority (currently GS1) allocates IACs to member organizations, which can be manufacturers, pooling companies, or any entity that owns or manages RTIs. These organizations then assign individual asset references to their RTIs.
Q: Can the same unique identifier be reused after an RTI is retired?
A: The standard strongly discourages reuse of a unique identifier after the retirement or destruction of the corresponding RTI. Reuse could lead to ambiguity if decommissioned assets remain in the supply chain. A significant time gap (e.g., 5 years) is recommended if reuse is unavoidable.
A: The standard strongly discourages reuse of a unique identifier after the retirement or destruction of the corresponding RTI. Reuse could lead to ambiguity if decommissioned assets remain in the supply chain. A significant time gap (e.g., 5 years) is recommended if reuse is unavoidable.
Q: How does this standard differ from ISO/IEC 15459-2?
A: Part 2 defines the registration procedures for issuing agencies, while Part 3 provides the common rules for constructing the identifier itself, including the combination of IAC and asset reference. Part 3 is dependent on Part 2 for the management of IACs.
A: Part 2 defines the registration procedures for issuing agencies, while Part 3 provides the common rules for constructing the identifier itself, including the combination of IAC and asset reference. Part 3 is dependent on Part 2 for the management of IACs.
Q: Are there any special characters allowed in the identifier?
A: Yes, the standard permits alphanumeric characters plus a limited set of special symbols (e.g., hyphen, period, space) provided the total length remains ≤50 characters. The specific set depends on the application and the data carrier used.
A: Yes, the standard permits alphanumeric characters plus a limited set of special symbols (e.g., hyphen, period, space) provided the total length remains ≤50 characters. The specific set depends on the application and the data carrier used.
© 2026 Technical Standards Review. This article is provided for informational purposes; refer to the official CAN/CSA-ISO/IEC 15459-3:07 document for authoritative requirements.