Seam Slippage Explained: How It Works in Performance Sportswear
Seam Slippage is best understood as yarn movement away from the seam. This entry explains how it behaves inside a finished garment rather than only in the laboratory.
What the term means
yarn movement away from the seam, which is why the value appears on almost every technical data sheet. Working figures for Seam Slippage normally sit around below 6 mm at 60 N in mainstream production. Note ISO 13936-2 fixed load on the tech pack so nobody tests against an older revision.
Why it matters in practice
it is the main seam failure mode in smooth filament fabric, so it influences buying decisions more than most buyers expect. Record elastane content alongside Seam Slippage, because blends shift the measured value. A result outside below 6 mm at 60 N usually points to process drift rather than to the fibre itself.
Typical values seen in activewear
below 6 mm at 60 N. Ranges vary by construction, so compare like with like. Keeping reference values for Seam Slippage lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 13936-2 fixed load, since both affect the reading.
How it is measured
ISO 13936-2 fixed load is the reference normally quoted on a test report. Working figures for Seam Slippage normally sit around below 6 mm at 60 N in mainstream production. Note ISO 13936-2 fixed load on the tech pack so nobody tests against an older revision.
Frequent mistakes
Comparing results from different standards, testing unwashed fabric, and writing the target without tolerance are the common errors. Record elastane content alongside Seam Slippage, because blends shift the measured value. A result outside below 6 mm at 60 N usually points to process drift rather than to the fibre itself.
