Definition
The maximum weight that can be safely placed on top of a loaded pallet or palletized unit load without causing damage to the products or pallet below. Stacking strength depends on the pallet's structural design, the compressive strength of the products, and the stability of the load configuration. Edge boards, top caps, and interlocked stacking patterns all contribute to increased stacking strength. This specification is critical for warehouse floor stacking and container loading.
Related Terms
Static Load
The maximum weight a pallet can safely support when resting on a flat, level surface without being moved. Static load capacity is the highest load rating for most pallets because the weight is evenly distributed across the bottom deck. A typical GMA pallet has a static load capacity of 2,500 to 5,000 pounds. Static load ratings are relevant for floor storage and long-term warehousing applications.
Stackable Pallet
A pallet designed to safely support loaded pallets stacked on top of each other in floor storage applications. Stackable pallets must have sufficient structural integrity to bear the combined weight of multiple loaded pallets without collapsing or shifting. The bottom deck design must be flat and stable to distribute weight evenly across the goods on the pallet below. Static load capacity is the key specification for stackable pallet applications.
Edge Board
A right-angle protective strip made from laminated paperboard or plastic, placed on the edges and corners of palletized loads to prevent strap damage and reinforce stacking strength. Edge boards (also called corner boards or angle boards) distribute the pressure from strapping or stretch wrap across a wider area, preventing the strapping from cutting into the product packaging. They also increase the compressive strength of a palletized unit load.
Top Cap
A flat sheet of corrugated board, plastic, or plywood placed on top of a palletized load before wrapping or strapping. Top caps distribute downward pressure from stacked loads, protect the top layer of products from dust and moisture, and provide a stable surface for stacking additional pallets on top. They are an inexpensive way to increase the stacking strength of a unit load and are widely used in distribution centers and warehouses.
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