Material: silicone with FEP coating. Autoclavable: yes. For tight sealing of DURAN ® flat flange vessels with groove indentation. Flat-flange vessels are large-volume reaction vials consisting of a lower part with a groove in the flat flange and a lid. Both parts are held together with the help of a separately available clamping ring. The silicone sealing ring serves to seal and prevent jamming of the ground surfaces between the lower part and the lid. Note: not suitable for desiccators. Flat flange sealing ring DURAN ® Silicone/FEP, red The use of a sealing ring guarantees very good tightness of the flat flange connection Temperature stable in the range -20 to +200 °C Excellent chemical resistance