Seam Strength Explained: How It Works in Performance Sportswear
Seam Strength is best understood as force needed to break a sewn seam. This entry explains how it behaves inside a finished garment rather than only in the laboratory.
What the term means
force needed to break a sewn seam, which is why the value appears on almost every technical data sheet. Working figures for Seam Strength normally sit around above 100 N specification in mainstream production. Note ISO 13935-2 grab method on the tech pack so nobody tests against an older revision.
Why it matters in practice
weak seams fail before the fabric does, so it influences buying decisions more than most buyers expect. Record elastane content alongside Seam Strength, because blends shift the measured value. A result outside above 100 N specification usually points to process drift rather than to the fibre itself.
Typical values seen in activewear
above 100 N specification. Ranges vary by construction, so compare like with like. Keeping reference values for Seam Strength lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 13935-2 grab method, since both affect the reading.
How it is measured
ISO 13935-2 grab method is the reference normally quoted on a test report. Working figures for Seam Strength normally sit around above 100 N specification in mainstream production. Note ISO 13935-2 grab method 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 Strength, because blends shift the measured value. A result outside above 100 N specification usually points to process drift rather than to the fibre itself.
