A Class 5 chemical integrator is the only chemical indicator designed to react to the full set of sterilisation conditions, not just one of them. That is why it is placed inside the pouch rather than on the outside, and why it is often paired with a daily biological indicator rather than used as a substitute for one.
What does a Class 5 integrator actually measure?
A Class 5 integrator responds to time, temperature and the presence of steam together, and its response is compared against the cycle parameters it was validated for. A Class 1 process indicator, the tape on the outside of a pouch, only confirms the pack was exposed to the process. A Class 5 indicator goes further by behaving like the sterilisation process itself, which is why standards treat it as a distinct class.
| Class | What it tells you | Common placement |
|---|---|---|
| Class 1 | Process indicator, exposure only | Outside the pack, on tape |
| Class 2 | Specific test, e.g. air removal | Used with a test pack |
| Class 4 | Multi-variable indicator | Inside the pack |
| Class 5 | Integrating indicator, full parameters | Inside the pack, on the load |
| Class 6 | Emulating indicator, defined cycle | Inside the pack, cycle-specific |
When do you need a Class 5 indicator inside a pouch?
Use one where a load needs stronger cycle assurance than a process indicator alone provides, and where the practice wants load-level evidence without waiting for a biological result. It does not replace the daily biological indicator. The two answer different questions: the integrator speaks to the conditions inside that pack, while the biological indicator speaks to whether the process killed a known resistant organism.
How is a Class 5 indicator used correctly?
Place it inside the pack, in the position least likely to see steam, which is usually the centre of the load or the most densely packed area. Record the result on the load record together with the cycle parameters. A result read after the pack has been removed and stored is far less useful, because the reading is meant to accompany the release decision.
How does a Class 5 differ from a Class 6 indicator?
A Class 6 indicator is validated to a defined cycle and is cycle-specific, whereas a Class 5 indicator integrates across the cycle it is used in. Some clinics keep both, using the class that matches their dominant cycle. The practical question is whether the indicator is validated for the cycle the sterilizer actually runs, so the cycle parameters and the indicator specification should be chosen together.
What should a clinic record?
Record the indicator class, its result, the load it was used on, and the cycle parameters for that load. If the practice audits its indicators later, that record is what shows whether a doubtful result was acted on. A result written down without the cycle it belongs to cannot answer that question.
Indicators and consumables: autoclave indicator tape 3-roll set, the 24-hour biological indicator 50-pack, and the DLAB HB105-S1 dry bath incubator. To start with monitoring, request the BI 5-pack sample.
Download the free printable compliance log sheet and run the log sheet generator. Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers. For site-specific guidance, ask a sterilization compliance specialist. Reselling? become a distributor.
Related reading
Sterilization compliance hub · Chemical indicator classes 1 to 6 explained · Autoclave tape vs pouch chemical indicators
Frequently Asked Questions
Does a Class 5 indicator replace a biological indicator?
No. The integrator reports the conditions inside that pack, while the biological indicator tests whether the process killed a known resistant organism. Most clinics use both.
Where should a Class 5 indicator be placed?
Inside the pack, in the position least likely to see steam, usually the centre of the load or the most densely packed area. Reading it after storage reduces its value.
What is the difference between a Class 5 and a Class 6 indicator?
A Class 6 indicator is validated to a defined cycle and is cycle-specific, while a Class 5 indicator integrates across the cycle it is used in. Choose the class that matches the cycle your sterilizer runs.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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