Jun 25, 2021 · Store your samples in these vials to eliminate leaching of ions while maintaining a consistent pH for the life of your sample. Storage vials China 20mm Headspace Vial Caps Sc201201 – China 5).PTFE/Silicone Septa Φ20*3mm Temperature Resistant -60ºC-200ºC with 9mm thread. 6).Crimp-top Aluminum Cap, 10mm C