Seam Strength How to Read It on a Lab Report
Laboratory reports present Seam Strength in a compact format. Knowing what each line means prevents misreading.
Definition reminder
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.
Common report layout
The report states method ISO 13935-2 grab method, sample description, conditioning, and the measured result. 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 result
Values near above 100 N specification usually indicate a conforming lot, assuming the fabric matches the sample submitted. 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.
Red flags
Missing revision numbers, unusual conditioning, and results without units all signal unreliable data. 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.
Questions to ask
Ask the laboratory for the standard revision and sample description before accepting or rejecting a result. 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.
