Dimensional Stability Testing: Shrinkage After Home Laundering
Shrinkage is the leading cause of fit complaints, and it can only be controlled if the test matches the care label.
What follows is a practical breakdown for sourcing and development teams, from specification through to verification.
Test method outline
Specimens are marked with reference points, washed under the labelled regime, dried and re-measured after conditioning.
Buyers who set expectations at the development stage spend far less time resolving complaints after the season has started.
Washing and drying variables
Temperature, cycle, detergent, drying method and number of cycles all change the result.
Agree the tolerance in writing before sampling, since tolerance disputes are far more common than outright failures.
- Request test reports on production fabric, not on development samples
- Verify the sampling plan and the number of specimens
- Store reports with roll or lot identification for traceability
Typical acceptance values
Plus or minus five percent is common for knits, with three percent for premium programmes.
Where several lines produce the same style, align settings across lines before the order starts.
Interaction with elastane
Heat drying accelerates elastane fatigue, which shows as growth rather than shrinkage in stretch fabrics.
Repeat the test when the fabric, the mill or the finishing route changes, as previous results no longer apply.
- Agree tolerances in writing before the first sample is made
- Define the measurement condition and the direction measured
- Review the limit each season against real performance data
Reporting practice
Report length and width change separately, plus the exact care regime, so results can be compared between labs.
Discuss the minimum order quantity with the yarn or process supplier before committing the style to the range.
Summary
The technical content is straightforward. The discipline lies in writing it down, testing it on production fabric and repeating the result on the next order.
