Single Packaging
What About Cobb … Testing?

Splash drops of water on cardboard

What is Cobb Testing?

If you previously read my blog Anatomy of A box, you learned about the various components that make up a corrugated box. The construction of a box can become even more complicated for dangerous goods. Not only do you need to provide strong, durable corrugated boxes that can withstand drops and movement during transportation, but they must also be able to withstand various weather conditions including snow and rain.

How can box manufacturers and test labs ensure that dangerous goods packaging is safe to use when it gets wet? This is where the Cobb test comes in handy. This test helps determine the quantity of water that can be absorbed by the surface of paper or board in a given time. In this case, the less water that absorbs into the corrugated, the better. In fact as per § 178.516 of CFR 49 as well as TP 14850 7.8 this test is a requirement.

Cobb Testing

Why Cobb Testing?

Cobb tests are performed, because paper and fiberboard tend to attract and hold water molecules from the surrounding environment. The Cobb test is essential as it tests the ability of the paper to resist the penetration of water and quantity of water absorbed by the surface of fiberboard. If fiberboard absorbs too much water, the box may have difficulty maintaining strength and integrity. In fact, the inner fluting can Continue Reading…