Is there any BI to validate the autoclave cycle at 108°C ?
You may want to look for BIs with Bacillus Subtilis “5230” as the challenge microorganism.
You can get more technical info about it on MesaLabs newsletter “Spore News”. Here is the link to the specific article: Biological Indicator for Monitoring Low Temperature Steam Sterilization
I hope this information is helpful to you.