These PS Petri Dishes are suitable for the microbiological application. 1. Vented Petri dishes have elevated lid which allows for good gas exchange and encourages evaporation 2. This design is useful when the poured dishes are to be used as soon as possible 3. Gamma sterilisation is as per iso1117 norms 4. The design of the dish maintains sterility becausethe particles would have to go up and over the dish wall to get inside which is very rare in normal airflow.