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Edge Crush Test (ECT) Optimization for E-Commerce Shipments

How To Maximize The Durability of Corrugated Boxes

The Edge Crush Test (ECT) is a critical performance metric for corrugated boxes, directly correlating to stacking strength and load-bearing capacity. In the high-stress world of e-commerce shipping, where packages face frequent handling, multi-stop routes, and varying climates, optimizing ECT values without over-engineering is essential for cost efficiency and product protection.

Why ECT Matters in E-Commerce

  • Stacking Strength: Determines how well boxes can withstand vertical loads in warehouse racking or trailer stacking.
  • Material Efficiency: Allows engineers to achieve performance targets with lighter weight liners or mediums, reducing costs.
  • Regulatory Alignment: Certain carriers and industry sectors specify minimum ECT ratings for compliance.
custom corrugated box with print sustainability

Balancing ECT and Basis Weight

  • ECT vs. Mullen Burst: ECT measures column strength; Mullen measures resistance to puncture/tearing. E-commerce often favors ECT for stacked pallet loads.
  • Lightweighting Strategies:
    • Use high-performance recycled fiber blends to maintain stiffness.
    • Incorporate higher-grade outer liners for localized reinforcement.

Design Variables That Influence ECT

  • Flute Profile: B- and C-flutes offer different stiffness profiles. B-flute generally yields higher ECT for the same board weight.
  • Adhesive Quality: Uniform glue lines prevent micro-buckling under compression.
  • Moisture Resistance: High humidity can reduce ECT by up to 50%; moisture-resistant coatings help maintain performance.
Corrugated Mailer

Testing and Standards

  • ASTM D642: Measures box compression strength.
  • TAPPI T839: Determines edgewise compressive strength of corrugated fiberboard using the clamp method.
  • ISTA Series: Full-scale distribution simulation, including drop, vibration, and compression under varying conditions.
Packaging and Material Drop Test Services

Optimization in Practice

  • Case Example: Switching from 44 ECT double-wall to 32 ECT single-wall with enhanced flute medium reduced material cost by 14% without increasing damage claims in a 90-day trial.
  • Prototyping: Lab ECT data should be validated through route-specific field testing before large-scale rollout.

References
ASTM International. (2015). ASTM D642-15: Standard test method for determining compressive resistance of shipping containers. ASTM International. https://www.astm.org/d0642-15.html
Technical Association of the Pulp and Paper Industry. (2018). TAPPI T839 om-18: Edgewise compressive strength of corrugated fiberboard using the clamp method. TAPPI. https://www.tappi.org/content/store/shared/T839.html
International Safe Transit Association. (2018). ISTA 6-Series transit tests. ISTA. https://ista.org/

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