Chlorine Resistance Solutions for Leggings: Sample to Bulk Timeline
A realistic plan for developing high-waist leggings with chlorine resistance solved, from first sample to repeat bulk.
Stage one: definition
Fix less than 15% modulus loss after 100 hours at 1 ppm chlorine and the construction route. This is where most delays originate, because unclear targets cause repeat sampling. Because the knee and seat areas flex thousands of times a session, target checks are made on a worn sample rather than flat fabric alone.
Stage two: laboratory sample
Request lab dips and a first fabric sample. Confirm against ISO 105-E03 chlorine water before cutting, then cut 3-5 pieces for fit. Keep ISO 105-E03 chlorine water named in the tech pack so every lot is measured the same way.
Stage three: wear trial
elastic loss and colour change after pool exposure appears during use. Run a two-week trial with studio, running and strength sessions participants before approving bulk. Where high-waist leggings is worn for studio, running and strength sessions, set tolerances around that range of movement.
Stage four: pre-production
Produce 30-50 pieces from bulk materials. This exposes process variation that a hand-made sample hides. Any change to interlock or single jersey around 220-260 GSM requires re-testing against less than 15% modulus loss after 100 hours at 1 ppm chlorine before bulk is released.
Stage five: repeat orders
Once approved, keep the recipe and report set together so the next order can be released without redevelopment. Past reports from ISO 105-E03 chlorine water help the mill reproduce the same recipe on the next order.
