Most CBRN boot failures are not dramatic. A seam tape lifts by two millimetres, a sole bond turns chalky, a lining holds grit that never comes out. A routine only works if it is written down, timed, and signed.
Inspection intervals and pass/fail criteria
Tie inspection to wear, not only to the calendar, and give each tier a written outcome.
**After every use, by the wearer, at doffing.** Check the sole bond line, the seam tape along the shaft, the closure (zip, drawcord or buckle), the gauntlet edge and the inside of the boot for grit or delamination. Fail on any lifted tape, chalky residue at the bond, or a closure that will not hold under load.
**Monthly, by a nominated inspector.** Run the unit's leak or air-decay check on the upper if one exists, flex the boot hard across the metatarsal crease, and look for cracks that open under flex but close at rest. Inspect the lining, where contamination and wear hide.
**Annually, alongside the training cycle.** Include a cold-flex check in the band the team actually works in; elastomers that pass at room temperature can crack at the crease in winter.
A boot that fails any tier leaves the response cache that shift, tagged and quarantined. "Probably fine" is not a category.
Cleaning is not decontamination
The SOP needs one decision line, placed before the sink rather than after it. Cleaning removes what you can see. Decontamination removes what you cannot, and it must be verified rather than assumed.
If a boot has been in the warm zone at a known agent, appearance proves nothing. A butyl upper can look spotless while agent sits in the sole grooves, the welt and the lining. The sequence is therefore clean, decontaminate, verify with whatever detection capability the unit has, then release with a signature. No signature, no return to the cache. Training wear with no agent involvement goes through cleaning only, and the record says so.
Agents the SOP may name
Restrict the list to agents named in the manufacturer's written compatibility data, at the stated dilution and temperature: pH-neutral detergent, water from ambient to lukewarm, a soft bristle brush, lint-free cloths.
Forbid everything else by default, including the solvents that "everyone uses". Aromatic and aliphatic hydrocarbons and ketones attack butyl; repeated concentrated hypochlorite hardens and embrittles elastomers; abrasive pads and wire brushes scratch the barrier; machine washing and hot-air drying distort the boot and shrink the lining. Silicone and oil dressings make an ageing boot look serviceable. Sequence matters as much as the agent, so write the order down.
Repair ceiling, retirement and the record
Repair restores mechanical integrity, not certified barrier performance. A patched boot is a training or downgraded-duty boot, and it should be marked as one.
Retire on any of the following: a breach in the upper or at the sole bond, a crack that opens under flex, sole separation past the written limit, contamination that cannot be verified as removed, or the service-life or decon-cycle cap.
For each pair keep one record: ID, size, batch or lot, issue date, every inspection with date and result and inspector, decontamination cycles counted, repairs, and retirement date with disposal route. Without cycle counts you cannot argue a failed batch with a supplier; without lot numbers you cannot quarantine the rest of it.
When specifying, ask for per-pair ID marking that survives decontamination, lot marking on the boot rather than the carton, the written cleaning-agent list keyed to the actual elastomer, written pass/fail and repair limits, and a stated retirement basis.