Type 4 multivariable indicator is meant for in-pack use and it shows whether the needed temperature and holding time were reached inside the pack. So this indicator measures time and temperature.
Indicator reaches the end-color when the combination of sterilization temperature, holding time and Vaporized Hydrogen Peroxide presence have been sufficient.
Indicator can detect following problems:
- Sterilization Plasma activation not present
- Sterilization holding time too short
- Insufficient VH2O2 penetration in loads (at the spot where the indicator is placed)