The 45 mm phenolic over-cap screws down over the open-top aluminium GL 45 cap covering and protecting the septum or stopper.

• Made from high-quality phenol formaldehyde resin (PF)
• High quality components
• Recommended usable temperature is 150 °C

The phenolic cap protects the septum or stopper from damage and contamination during storage or shipping. Phenolic caps provide a wide range of chemical compatibility and temperature tolerance.