Seam Strength Why Shipments Get Rejected Over This
Many disputes come down to Seam Strength. Below is what inspectors check and why shipments fail.
The core definition
force needed to break a sewn seam. 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.
Most common cause of failure
Results usually fall outside above 100 N specification because the target was never written into the order. 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.
How it is checked
Inspection and laboratory work both refer to 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.
Related faults
weak seams fail before the fabric does, so related complaints often point back to this single parameter. 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.
Avoiding rejection
Agree targets, tolerances and the method before production, then test per lot rather than per shipment. 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.
