BASIC INFORMATION - Board Grade Options

The bottom of the box carries a seal, the Box Manufacturer's Certificate (BMC). It indicates the strength of the board and the weight limit.

The strength of corrugated board defines how much weight a box can withstand, and is determined based on a strength test.

There are two recognized tests.

1. Burst Test/Mullen Test - This measures the pounds per square inch needed to rupture the board from internal or external forces.

2. The Edge Crush Test (ECT) -This measures the top and bottom compression of the corrugated board. This is a primary factor in predicting the compression strength of a completed box.
The higher the number, the stronger the box.