Shock Indicator
A shock indicator is a single-use, impact-detection device affixed to shipments, containers, or equipment to show whether a preset g-force threshold has been exceeded during handling, transit, or storage. It provides immediate visual evidence of potential impact, typically changing color irreversibly when triggered, enabling receiving teams to quarantine and inspect affected loads.
On a manufacturing shop floor, shock indicators function as an interface-control tool for inbound high-value or fragile materials. When a pallet of precision assemblies or medical devices arrives, receiving staff scan the indicator before signing off. A triggered device triggers a documented exception workflow: the unit is quarantined, routed to incoming inspection, and subjected to dimensional checks or functional testing before release to stock or production. If the indicator remains clear, material flows normally. This process separates transport-related mishandling from process defects, supporting materials traceability and damage attribution. If triggered units are accepted, they are logged with reservations, and the event is recorded for carrier performance review or supplier corrective action. The goal is to prevent hidden impact damage from entering WIP, where it could cause downstream scrap, line stoppages, or disputed supplier returns. Shock indicators also support inventory accuracy by ensuring only qualified material is consumed or assembled.
What does a shock indicator actually measure?
A shock indicator measures whether a shock event exceeded a predefined g-force threshold at the specific location where the device is mounted. It does not measure product damage directly, nor does it record peak force, number of impacts, or whether later forces were higher. It is a threshold-based go/no-go signal for transport load exceedance.
Is a shock indicator a measurement instrument?
No. Industry guidance describes it as an interface-control and documentation device, not a metrology instrument. It should not be used alone to certify product condition. It provides a visible chain-of-custody signal that an impact threshold may have been exceeded, but qualified inspection is still required to confirm actual damage.
What should receiving do when a shock indicator triggers?
Receiving should document the event, accept the load with reservation if appropriate, and route it to qualified inspection. The unit should not be automatically rejected solely because the indicator triggered, nor should it be immediately released to stock. Inspection and documentation are the proper response.