Seam Strength Test Methods and Acceptable Limits
Seam Strength is verified through ISO 13935-2 grab method. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
ISO 13935-2 grab method defines sample size, conditioning and calculation, so values are comparable only within the same revision. 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.
Result interpretation
Read the value together with construction notes; above 100 N specification is only meaningful for similar fabrics. 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 limits
Buyers commonly write above 100 N specification with a stated tolerance, then verify against ISO 13935-2 grab method. 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.
Sources of variation
Conditioning time, operator technique and shade all influence the result. 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.
Documentation
Record the standard revision on every report, because older versions can differ from current practice. 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.
