- This classification is based on the performance requirements of the indicators.
- Knowing which type the indicator belongs to is important to choose the correct application in the monitored sterilization phase.
- The reaction takes place under the influence of one or more of the important critical parameters
- The purpose of using chemical indicators is to identify possible sterilization errors that may result from improper packaging, improper loading of the sterilizer or malfunctions of the sterilizer.
- Chemical test results should not be taken as an indication of sterility.
- Type 3, 4 indicators can be used in the package
- Type 5 is preferable for package and load control

- Type 6 indicators can only be used for package or load control provided that the sterilization program is appropriate.
- In centers where parametric validation and parametric product delivery can be performed, package or load indicators are not mandatory. It is sufficient to have a process indicator only on the package.