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TAPPI T 550 Moisture (equilibrium)






Determination of equilibrium moisture in pulp, paper
and paperboard for chemical analysis

Scope and significance

The TAPPI T 550 Moisture procedure applies to pulp, paper, paperboard, and paper products, except those containing significant quantities of materials other than water that are volatile at 105 ± 2°C or less or for materials that are oxidized or decomposed above 102°C.

This method should be followed to calculate the results of a chemical analysis of pulp, paper and paperboard on a moisture-free basis.

This method should not be used to determine an “as received” or “use” moisture content. Use TAPPI T 412 “Moisture in Paper.”


Please note: