Method: T 441
Title: Water absorptiveness of sized (non-bibulous) paper, paperboard, and corrugated fiberboard (Cobb test)
This method determines the amount of water absorbed by paper, paperboard, and corrugated fiberboard in a specified time under standardized conditions. Water absorptiveness is a function of various characteristics of paper or board such as sizing, porosity, etc. This method is generally applicable to sized paper, paperboard and corrugated fiberboard, but it is not recommended as a sizing test for writing paper. This method does not measure the absorptive capacity of tissue and toweling products.
To perform adequate testing five, 8.5” x 11” sheets are requested. Five replicates for both the felt and wire side of the paper will be tested. If sample quantity is limited, testing can be done by sampling fewer sheets and/or performing fewer replicates. If additional TAPPI test methods are requested, ten sheets may be required to perform all testing.
IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.