Biological Indicators
The Bionova® BT31 Biological Indicator is designed for the control of Dry Heat sterilization processes.


Product type
BT31 Spore ampoules for dry heat sterilization
Main application
Monitoring depyrogenation and dry heat sterilization cycles in ovens and tunnels
Key benefit
Reliable detection of sterilization efficacy with 72-hour final readout in culture medium
Technology or differentiator
Bacillus atrophaeus ATCC® 9372 spores (1.0–4.9 × 10⁶ per ampoule)
Compatibility / usage environment
Designed for healthcare and industrial use; incubated at 37 ℃ in Bionova® IC10/20 with MC1020-2 culture medium