Water Absorption According to Cobb/Cobb Test

ISO 535, DIN EN 20535 und TAPPI T 441

The Cobb test is used to determine the water absorptivity of paper, cardboard and corrugated cardboard. The Cobb Test is carried out according to the following standards: ISO 535, EN 20535 and TAPPI T 441.

Cobb Test with ZwickRoell

Easy operation.
The dry specimen is weighed and placed under a vertical cylinder with an internal cross-section of 100 cm².
Specimen and cylinder rest on a rubber mat supported on a steel plate.
Approx. 100 ml of water is poured into the cylinder.
After a precisely defined time the water is poured out and excess water is removed from the specimen using blotting paper and a roller.
The specimen is weighed while wet and the amount of water absorbed by 1 m² of specimen material is calculated.