Tensile test paper wet strength

DIN ISO 3781 determination of wet breaking load after immersion in water, calculation of relative wet strength relating to initial strength of paper conditioned under standard climate.

In short — AI-generated

This test determines the tensile strength of paper after it has been soaked in water, following the DIN ISO 3781 standard. A paper strip is immersed in water for a defined period and then pulled in a tensile testing machine until it breaks to measure the remaining load-bearing capacity.

The result is expressed as the relative wet strength, which compares the breaking load of the wet paper to its initial strength under standard climate conditions. This value is essential for assessing the durability of paper-based packaging that may be exposed to moisture, such as medical sterilization bags or food packaging.

Text is AI-generated; based on test method data curated and verified by Innoform.

Test Method Group: Mechanical properties

Norms:

DIN ISO 3781 (2012-07) Paper and board – Determination of tensile strength after immersion in water
DIN EN 868-4-B (2025-09) Packaging for terminally sterilized medical devices – Part 4: Paper bags – Requirements and test methods
DIN ISO 1924-3 (2007-06) Paper and board - Determination of tensile properties - Part 3: Constant rate of elongation method (100 mm/min)
DIN EN ISO 1924-2 (2009-05) Paper and board – Determination of tensile properties – Part 2: Constant rate of elongation method (20 mm/min)

Required Sample Amount: approx. 0,1 - 0,2 m² or 2 DIN A 4 sheets, minimum sample width resp. length 150 mm, optimum: paper samples over total material width, e. g. approx. 2 linear meters for a film width of 0.5 m

« Back to overview