Pouch sealer calibration records are one of the least standardised documents in a clinic's infection control file, and one of the first things a reviewer asks to see when a pouch fails at the point of use. This article sets out which tests apply to paper and film pouch seals, what belongs in the record, and how to structure a record set that survives a practice visit.
Three sentences of answer: pouch seal quality is verified by seal strength testing and by seal integrity testing, the record should show the sealer, the setting, the test method, the result and the tester, and the record set should be continuous rather than reconstructed after a problem. ISO 11607 provides the packaging framework, and ASTM test methods define the mechanical tests that support it.
Which tests apply to pouch seals?
Two families of tests matter. Strength tests measure how much force the seal withstands, and integrity tests detect channels or gaps that a strength test can pass over.
For seal strength, the peel test is the common method: the seal is pulled apart at a controlled rate and the force required is recorded. For seal integrity, dye penetration and bubble emission tests are used, with dye penetration being the more common bench method. Both tell you something the other cannot, which is why packaging validation uses both.
For a clinic, the practical application is narrower than a full packaging validation. A clinic is verifying that its sealer is within the process window defined by the pouch manufacturer, and it needs a repeatable test it can actually run.
What belongs in a sealer calibration record?
The record should identify the sealer, the setting, the measurement, the test that confirmed the seal, and the person who did it. If a measurement instrument was used, note when it was last verified.
Below is the field set that has held up in clinic practice, organised so that one page covers a month.
| Record field | What to enter | Why a reviewer wants it |
|---|---|---|
| Sealer identifier | Serial number, not just room name | Lets a drift pattern be traced to one unit |
| Set temperature | Displayed set point | Establishes intended process window |
| Measured temperature | Probe reading and positions measured | Shows whether the set point is real |
| Pouch type and width | Manufacturer, format, width | Parameters differ by pouch construction |
| Seal appearance | Uniform, channel, wrinkle or incomplete | Detects defects a probe cannot |
| Strength or integrity test | Method and result | Substantiates that the seal holds |
| Tester and date | Name, initials, date | Connects the record to a trained person |
| Action taken | Adjustment, re-test, service call | Shows the record is used, not just filed |
Why do seal strength and seal integrity both matter?
Seal strength answers whether the seal holds under handling and transport. Seal integrity answers whether the seal is continuous. A seal can be strong at its tested point and still contain a narrow channel a few millimetres away, and that channel defeats the sterile barrier without showing up in a peel test taken at one location.
That is why a destructive peel test is normally paired with periodic inspection along the whole seal length, and why a change in seal appearance is a trigger for a more careful look rather than a cosmetic note. Visual inspection is the least expensive integrity screen a clinic has.
For pouches where the indicator is part of the construction, the indicator's behaviour is a separate verification from the seal. A correctly sealed pouch with a non-responsive indicator still fails the purpose of the packaging.
How should calibration records be structured over time?
Structure them so a trend is visible without reading every page. A monthly summary line that records the highest and lowest measured band temperature gives a reviewer the shape of the year in one column, with the daily and monthly detail behind it.
Add a trigger list for non-scheduled tests: after a service visit, after a power interruption during a seal, after switching pouch brand or width, and after any reported peel failure at the point of use. Each trigger should produce a record entry with a result, not only a note.
Keep the sealer record with the sterilizer log rather than in a separate folder. Reviewers look for consistency between the packaging process and the cycle monitoring process, and one folder makes that consistency visible.
Where a clinic is also standardising cycle monitoring, keeping the consumable line simple helps the record stay continuous. A 5-pack biological indicator trial and the sterilization monitoring collection cover the cycle side of the same file.
Related reading
ISO 11607 pouch sealing for dental instruments: seam width and validation · Sterilization pouch seal width and peel strength: which specs apply · Case review: cutting pouch waste with a sealer calibration routine
Hub: Sterilization compliance hub
Frequently Asked Questions
What is the difference between seal strength and seal integrity testing?
Seal strength measures the force a seal withstands when pulled. Seal integrity detects channels, gaps or incomplete seals. A seal can be strong at the tested point and still contain a channel elsewhere.
How often should pouch sealer calibration be recorded?
Monthly verification is a practical baseline in a busy clinic, recorded with the measured band temperature and the test that confirmed seal quality. Add entries after service visits, power interruptions and pouch changes.
What should a sealer calibration record contain?
Sealer serial number, set temperature, measured temperature with positions, pouch type and width, seal appearance, test method and result, tester and date, and the action taken.
Does ISO 11607 apply to a clinic running a benchtop sealer?
ISO 11607 provides the packaging framework that clinic practices align with. Full validation belongs to the packaging manufacturer; the clinic's obligation is to demonstrate its sealing process stays within the parameters those validations assume.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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