The core of traceability of raw materials is to maintain a clear correspondence between material documentation, batch identification, and physical items. If only documents are stored without any ability to locate specific parts, it becomes difficult to conduct subsequent inspections.

How labels are updated as materials move

After materials are transformed from their original form into individual items or parts, the original labels may be removed. It’s important to establish rules for transferring labels before splitting or processing, so that each item can still be linked to its corresponding source record. The method of labeling should avoid affecting the surface of the items or interfering with subsequent processing steps.

Continuity of information during outsourcing processes

When materials or parts are transferred to external parties, the transfer documents should specify the identity, quantity, and status of the items. After receipt, it’s necessary to verify the correspondence between the returned items and those sent out, as well as whether all processing records are complete. The traceability chain should not be interrupted during cross-organizational transfers.

When materials are split, transferred, or outsourced, labels and records should be updated accordingly to reflect changes in status. Risks associated with mixed batches often occur at the point where the location of materials differs from the recorded information.

Additional information must be supported by evidence

When records are missing, it’s not sufficient to rely solely on visual similarities or storage locations to determine the batch. Verification must be conducted based on original documents, transfer records, and actual labels. Relationships that cannot be restored need to be addressed through appropriate review procedures, rather than by simply reattaching a number to fill in missing entries.

Sampling to verify the traceability chain

Regular inspections should involve randomly selecting finished products, tracing back to the source of the materials, and then verifying the usage history in reverse order. Two-way verification can help identify issues such as multiple batches being used together, inconsistent quantities, or omissions in the transfer sequence.

Process example: Maintaining identity after material splitting

Assume that a batch of materials is divided into several individual items. The original labels should only be retained on the remaining materials. If there is no prior record of the splitting process, it becomes difficult to determine the origin of each item after it enters different manufacturing processes. During splitting, it’s possible to record the quantity and destination of each item, and to assign identity tags as required. In subsequent inspections, it’s necessary to be able to identify the corresponding batch from any item, and to trace the usage history back to the original batch. This creates a verifiable two-way relationship between items.

Common questions: Can batches be filled in based on appearance and storage location?

Appearance or location alone cannot serve as reliable identifiers. Any additional records must be verifiable. If the information cannot be confirmed, it should be sent for review.

Key points for verification during implementation

• Still traceable after splitting
• Consistent quantity at the time of transfer
• Additional information is based on valid evidence
• Can be verified in both directions

If materials with unclear origins or statuses are found, they should be isolated for verification. Once the information is restored to its completeness, subsequent actions should be decided according to the established procedures.