How we test the seal
Every batch goes through a seal-integrity test to confirm there is no leak path. A swab that passes here is one whose iodine can not quietly escape on the shelf.
Light-proof barrier film
Iodine is both volatile and light-sensitive. A lesser film would let it migrate out and let light break it down. The pouch is a light-proof barrier laminate chosen to keep the cotton head saturated at the correct available iodine until the moment it is opened.
36-month stability
Shelf life is not assumed — it is backed by a 36-month stability programme. Retention samples are observed across the product's life, and the release criterion is strict: available iodine must still be 4.5–5.5 g/L at 36 months. Iodine decay over time is the core thing this control protects against. Protect the seal and the film, and you protect available iodine, pH and fluid content over time.
