Interlock Test Methods and Acceptable Limits
Interlock is verified through interlock machine. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
interlock machine defines sample size, conditioning and calculation, so values are comparable only within the same revision. Working figures for Interlock normally sit around 200-280 GSM in mainstream production. Note interlock machine on the tech pack so nobody tests against an older revision.
Result interpretation
Read the value together with construction notes; 200-280 GSM is only meaningful for similar fabrics. Record elastane content alongside Interlock, because blends shift the measured value. A result outside 200-280 GSM usually points to process drift rather than to the fibre itself.
Typical limits
Buyers commonly write 200-280 GSM with a stated tolerance, then verify against interlock machine. Keeping reference values for Interlock lets suppliers quote without extra sampling rounds. Ask for conditioning details together with interlock machine, since both affect the reading.
Sources of variation
Conditioning time, operator technique and shade all influence the result. Working figures for Interlock normally sit around 200-280 GSM in mainstream production. Note interlock machine 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 Interlock, because blends shift the measured value. A result outside 200-280 GSM usually points to process drift rather than to the fibre itself.
