DURAN® bromobutyl rubber closures provide a gas tight seal for GL 25 or GL 45 glass laboratory bottles. As a material, bromobutyl rubber is essentially impermeable to most gases, and the stopper provides a controlled environment inside the glass bottle for oxygen sensitive materials. Useful for maintaining anaerobic culture conditions. Bromobutyl rubber allows for multiple punctures providing easy access to the contents with a syringe. A Type III Packaging Material DMF (#35811) for these products has been filed with the FDA.

• Straight plug, grey
• Bromobutyl rubber elastomer conforms with EP 3.2.9 Type I closure for chemical and penetration tests
• Gas tight seal provides a controlled environment inside the bottle
• Lot specific Certificate of Conformance (CoC) available
• A Type III Packaging Material DMF (#35811) for these products has been filed with the FDA
• Elastic material for effective sealing and reliable self-sealing after needle piercing (21-gauge “21G” or smaller)
• Multiple punctures providing easy access to the contents with a syringe
• Stopper shapes and material properties optimised to fit DURAN® GL 25 or GL 45 bottles
• Suitable for autoclaving / steam sterilising at 121°C for 20 minutes
• Wide usable temperature range: -50 to +121°C
• Septum for head-space analysis