Water Absorption According to Cobb/Cobb Test

 ISO 535, EN 20535 and 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 water absorption test

Cobb Tests 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.
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