· High permeability: allows the exchange of oxygen and carbon  dioxide, maintaining normal respiration of the culture. 

· Waterproof and moisture-proof: effectively prevent water  evaporation and external moisture from entering, and maintain the humidity of the culture environment. 

· Anti-pollution: effectively block the invasion of bacteria, fungi  and other microorganisms to reduce the risk of pollution. 

· High transparency: easy to observe the growth of the culture. 

· High temperature resistance: can withstand high temperature  sterilization (such as high pressure steam sterilization).