A Calgary dental clinic eliminated most of its pouch seal failures within one quarter of a failed infection prevention audit, without buying a new sterilizer. The audit finding was narrow: sealed pouches were opening after handling, and the clinic could not show that its sealer was producing a continuous seal. The fix combined a sealer calibration routine, a wider seal margin and a peel check that staff actually recorded. Facility details are withheld at the clinic's request; the sequence below follows its own audit response file.
Seal failures are usually blamed on the pouch. In this clinic the pouch was fine and the process was not. The team was using a Class 4 dual-indicator sterilization pouch with a paper-to-film seal, and it was sealing across the gusset fold on roughly one pouch in nine.
What did the failed audit find?
The auditor sampled 40 pouches from storage and from the wrapped instrument shelf. Four defects repeated:
- Seals crossing the fold. Pouches were loaded so the gusset sat inside the seal band, producing a channel at each end.
- Drifting seal temperature. The constant-heat sealer had not been checked in over a year. Its set point read 200 °C, but the actual jaw temperature was low enough that the seal looked closed and peeled open.
- No seal record. Staff confirmed visually that a seal “looked good”, but no one recorded a peel or seal-width check.
- Overfilled pouches. Instrument sets were pressed into a pouch size that left no room for the film to expand during the vacuum phase.
Which changes removed the failures?
| Control | Before | After one quarter |
|---|---|---|
| Seal position | Gusset inside the seal band on some pouches | Seal at least 25 mm from the pouch edge, never across a fold |
| Sealer verification | No routine check | Jaw temperature and seal width checked at the start of each shift using a constant-heat pouch sealer with a 12 mm seal band |
| Peel test | Visual only, unrecorded | Five-point peel test per shift, initialled |
| Sampled seal failures | 11% of 40 pouches | Under 1% of 120 pouches |
The sealer change mattered less than the routine around it. A sealer with a 12 mm band only helps if the operator keeps the fold out of that band and verifies the jaw is at temperature. The clinic posted a one-page card at the sealer with three checks: temperature readout, seal width against a gauge, and a peel test on a scrap pouch.
How do you run a peel test without wasting pouches?
Use the offcut from a trimmed pouch or a pouch that failed inspection. Seal it, let it cool, then peel from one corner at a steady rate. The seal should peel with visible fibre transfer from the paper to the film; a clean release with no fibre means the seal was weak. Do this at the start of each shift, and after any change to the sealer, the pouch lot or the operator. Record the result on the same sheet as the cycle log so the two can be read together.
What should a clinic check before ordering pouches?
Match the pouch to the load, not to the shelf. A pouch that is too small forces the film against instrument edges, and sharp corners create pinholes that no seal check will catch. Check the indicator class printed on the pouch: a Class 4 indicator responds to two parameters and is a process indicator, not a release test. Pouches should be stored flat, away from direct light and heat, and used within the manufacturer's stated shelf life. If a pouch has been stored in a humid area, the paper will feel soft and the seal will not hold.
For Ontario clinics, the release question sits alongside the monitoring rule: in Ontario, the RCDSO requires a biological indicator for each sterilizer on every day it is used, recorded in a logbook. A seal check does not replace that test. It reduces the number of loads that have to be repeated because a pack opened during handling.
What is the difference between a seal failure and a sterilization failure?
A seal failure is a barrier failure: the pack is no longer sterile because the pouch opened or channelled. A sterilization failure is a process failure: the cycle did not achieve the required conditions, which the biological indicator detects. They look similar at the shelf and have different fixes. If packs open, audit sealing and handling. If indicators turn positive, audit the cycle, the load and the indicator handling. Treating one as the other wastes money and delays the real repair.
Related reading
- Sterilization pouch seals: why they fail and how to check them
- Can sterilization pouches be re-autoclaved?
- Sterilization roll (gaine) explained: is it the same as a pouch?
Download the printable sterilization log, or build a cycle sheet with the log generator. Ask a Compliance Specialist at our consultation desk. Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers account setup for institutional buyers. Start with a 24-hour biological indicator 25-pack to pair a seal routine with daily monitoring. Reselling? become a distributor.
Frequently Asked Questions
Why do sterilization pouch seals fail after autoclaving?
Common causes are a seal that crossed a fold, a sealer jaw below its set temperature, an overfilled pouch, or a pouch stored in humid conditions. The pouch material is rarely the cause when failures cluster in one shift.
How often should a pouch sealer be checked?
Check the jaw temperature and seal width at the start of each shift, and run a peel test after any change to the sealer, pouch lot or operator. Record the result beside the cycle log.
What seal width should a sterilization pouch have?
A continuous seal of at least 6 mm is typical, and a 12 mm band gives margin for placement error. Keep the seal at least 25 mm from the pouch edge and never seal across the gusset fold.
Does a seal check replace a biological indicator?
No. A seal check verifies the barrier; a biological indicator verifies the sterilization process. Both are needed, and in Ontario the biological indicator is expected for each sterilizer on every day it is used.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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