How durable is a container airbag?

The Invisible Heroes of Security

During a shipment, cargo accumulates enormous kinetic energy due to sudden braking, rough waves, or railway maneuvers. Container airbags (dunnage bags) that counteract this energy are not just "inflated balloons," but high-tech equipment capable of withstanding tons of pressure.

The Universal Language of Durability: AAR Levels

The load capacity of airbags is measured by standard levels established by the Association of American Railroads (AAR). These levels determine the mode of transport and the weight of the load for which the airbag should be used.
Level 1 (Seviye 1): Ideal for truck and trailer transport. Used for securing light to medium-sized loads.
Level 2: Designed for sea container shipments. It has higher pressure resistance against wave action.
Level 4 & 5: It is used for railway wagons and heavy industrial loading (rolled sheet metal, marble, etc.). A cushion of this level is strong enough to stabilize loads exceeding 100 tons.

Material Strength: Polypropylene vs. Kraft

Polypropylene Container Airbag: It is produced by cross-weaving polypropylene yarns. This structure makes the cushion exceptionally resistant to punctures and tears. It also exhibits complete resistance to moisture, which ensures its durability during long sea voyages.

Kraft Container Airbag: It is produced from multi-layered (2, 4, 6 or 8-ply) special papers. Kraft paper is characterized by its high coefficient of friction and the rigid structure it acquires when expanded. It is excellent at maintaining its shape under heavy loads.

Pressure and Burst Limits

The durability of an airbag is understood by the difference between its "operating pressure" and "burst pressure".
Example: A standard Level 1 airbag typically operates at a pressure of 2-3 PSI (approximately 0.2 Bar). However, the burst point of this airbag is usually around 8-10 PSI. This safety margin is designed to absorb the extra pressure that a sudden movement of the load would apply to the airbag.