These silicone rubber sponge stoppers are ideal for bacteriology, for long-termcultures, for filling and sterilising culture media and for the cultivating aerobic micro-organisms. Allows half the evaporation associated with regular cotton stoppers.

• Can be sterilised approx. 300 times at 180 °C for 10 hours
• Not hygroscopic
• Porous
• Washable and reusable
• Flexible, for test tubes and flasks