Wet expansion, also known as hydroexpansion, is determined as the percentage change in the length of a test piece after soaking in water.
Differences in wet expansion across and along a sheet can result from the alignment of paper fibres in the grain direction. Understanding wet expansion can be important for applications where dimensional stability when wet affects performance, including books and outdoor posters.
Standards
Testing is performed in accordance with BS 5879.
Talk to our experts about your paper material, application and dimensional stability requirements.
