20mm Aluminum Closures
The 20mm Crimp Neck Closure produced by Aijiren is easy to seal, and it is very used with Headspace Vial. Because aluminum is a metal, it has high density and is not easy to breathe. Even with Center Hole, the matching Septa is a composite of 3mm thick Silicone and PTFE. Septa is 2mm thicker than ordinary Closures Septa. This thickness ensures the sealing of Closures. When the Crimp Cap is squeezed for sealing, the thickness of 3mm can just fill the gap between Cap and Vial after being squeezed.