Our solution here is to use seals (septa) made from high-quality base compounds and coated with fluorinated films on one or both sides. This combination allows complete sealing without interfering with the bottled media. A number of standard combinations have emerged in this area and are kept in stock at all times. As in all of our product areas, special combinations are also available as custom-made products. Sealing inserts without a fluorinated coating are also suitable for less critical applications.