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The difference between a 32 ECT (Edge Crush Test) box and a 200-pound test corrugated box lies primarily in how their strength is measured and the type of performance they are designed to indicate.

1. **Measurement Method**:
- **32 ECT Box**: The Edge Crush Test measures the box's ability to resist crushing when force is applied to its edges. It assesses the stacking strength of the box and is expressed in pounds per inch (lbs/in). A 32 ECT rating means the box can withstand 32 pounds of pressure per inch on its edges before collapsing.
- **200-Pound Test Corrugated Box**: This box is rated based on the Mullen Burst Test, which measures the box's resistance to bursting under pressure. A 200-pound rating indicates that the box can withstand 200 pounds of pressure per square inch (psi) before bursting. This test evaluates the box's overall durability and resistance to punctures and tears.

2. **Performance Characteristics**:
- **32 ECT Box**: Better suited for scenarios where stacking strength is critical. These boxes are commonly used in applications where boxes will be stacked on top of each other during storage or transport.
- **200-Pound Test Corrugated Box**: More appropriate for scenarios requiring puncture resistance and protection against rough handling. These boxes are often used in environments where the box might be subjected to impacts or need to contain heavier contents.

3. **Construction and Use**:
- **32 ECT Box**: Typically lighter and may use less material than an equivalent 200-pound test box, which can lead to cost savings and reduced shipping weight.
- **200-Pound Test Corrugated Box**: Often heavier and thicker, providing better protection for contents against bursting and puncturing, making them suitable for heavier or more delicate items.

In summary, a 32 ECT box is optimized for stacking strength, while a 200-pound test corrugated box is designed for burst resistance and overall durability. The choice between the two depends on the specific requirements of the shipping and storage conditions.