Aijiren Tech™ Screw Vial Convenience Kit, 40mL amber glass vial, solid top PTFE-lined cap, Store your samples in these vials to eliminate leaching of ions while maintaining a consistent pH for the life of your sample. Storage vials range from 2mL to 40mL. Pricing and Availability. Aijiren Tech™ 20 mm Headspace Vials, Septum, and Caps.