Modulus Explained: How It Works in Performance Sportswear
Modulus is best understood as force required to reach a given extension. This entry explains how it behaves inside a finished garment rather than only in the laboratory.
What the term means
force required to reach a given extension, which is why the value appears on almost every technical data sheet. Working figures for Modulus normally sit around 4-8 kPa at 30% extension in mainstream production. Note ISO 13934-1 modulus on the tech pack so nobody tests against an older revision.
Why it matters in practice
it defines support level in compression fabric, so it influences buying decisions more than most buyers expect. Record elastane content alongside Modulus, because blends shift the measured value. A result outside 4-8 kPa at 30% extension usually points to process drift rather than to the fibre itself.
Typical values seen in activewear
4-8 kPa at 30% extension. Ranges vary by construction, so compare like with like. Keeping reference values for Modulus lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 13934-1 modulus, since both affect the reading.
How it is measured
ISO 13934-1 modulus is the reference normally quoted on a test report. Working figures for Modulus normally sit around 4-8 kPa at 30% extension in mainstream production. Note ISO 13934-1 modulus 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 Modulus, because blends shift the measured value. A result outside 4-8 kPa at 30% extension usually points to process drift rather than to the fibre itself.
