What is the edge crush test formula and how is it used in packaging?

[prestogroup]

The edge crush test formula is used to determine the compressive strength of corrugated boards by measuring how much pressure they can withstand when force is applied to their edges. This test is essential in the packaging industry because it predicts how well a box will perform during stacking, shipping, and storage.

Edge Crush Test Formula​

The commonly used formula to calculate the edge crush value is:

ECT (kgf/cm) = Maximum compressive force (kgf) / Length of the specimen (cm)

This formula helps convert the measured bursting force into a standardized strength value. In many regions, the ECT value is also expressed in lb/in , depending on industry standards.

Why the ECT Formula Matters​

Using the edge crush test formula enables manufacturers to:

• Determine the stacking strength of corrugated boxes
• Select the right board grade for heavy or fragile products
• Reduce packaging failures during transportation
• Optimize material usage without compromising strength

Applications in Packaging​

The test is crucial for industries that rely heavily on corrugated packaging, such as electronics, FMCG, food, logistics, and e-commerce. It ensures that the box can resist vertical loads and maintain its shape under pressure.

Why Choose PrestoGroup for ECT Testing?​

PrestoGroup provides precise, reliable edge crush testing instruments designed with strong clamping systems, accurate load sensors, and digital readouts. Their testers help manufacturers achieve consistent ECT values and maintain high-quality packaging standards, ensuring the best protection for shipped goods.