Water Repellency Spray Test Test Methods and Acceptable Limits
Water Repellency Spray Test is verified through AATCC 22 spray test. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
AATCC 22 spray test defines sample size, conditioning and calculation, so values are comparable only within the same revision. Working figures for Water Repellency Spray Test normally sit around grade 4 to 5 target in mainstream production. Note AATCC 22 spray test on the tech pack so nobody tests against an older revision.
Result interpretation
Read the value together with construction notes; grade 4 to 5 target is only meaningful for similar fabrics. Record elastane content alongside Water Repellency Spray Test, because blends shift the measured value. A result outside grade 4 to 5 target usually points to process drift rather than to the fibre itself.
Typical limits
Buyers commonly write grade 4 to 5 target with a stated tolerance, then verify against AATCC 22 spray test. Keeping reference values for Water Repellency Spray Test lets suppliers quote without extra sampling rounds. Ask for conditioning details together with AATCC 22 spray test, since both affect the reading.
Sources of variation
Conditioning time, operator technique and shade all influence the result. Working figures for Water Repellency Spray Test normally sit around grade 4 to 5 target in mainstream production. Note AATCC 22 spray test 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 Water Repellency Spray Test, because blends shift the measured value. A result outside grade 4 to 5 target usually points to process drift rather than to the fibre itself.
