Standard 20mm aluminum seal Headspace Vials with Flat Bottoms that form a tight seal with closure for accurate analysis and reproducible results. They are 

Vials for gas chromatography (headspace vials) are available in different sizes with standard aluminum seals, magnetic seals or pressure release seals.

Clear 20 ml headspace vials designed to fit most headspace autosamplers.Designed to use separating organic and inorganic compounds for analysis, 

Vials for gas chromatography (headspace vials) are available in different sizes with standard aluminum seals, magnetic seals or pressure release seals.

Headspace Vials + Closures ND20 + ND18 (Headspace Compatibility Chart). 9.3. Other Crimp Neck Vials ND20 and Screw Neck Vial ND18. 9.4. Aluminum Crimp Seals 

quantities of 20 mm headspace vials and aluminum seals with prefitted septa. ... Convenience Kit, 20mm Headspace Crimp Vial, Beveled Edge, Round Bottom, ...

10/20mL Clear /Amber Precision Crimp Headspace Vial, Flat/Round Bottom, 22.5*46mm . 5).PTFE/Silicone Septa Φ20*3mm Temperature Resistant -60℃-200℃ with 9mm 

Chromatography Vials www.restek.com. Pure Chromatography. • 2 & 4 mL Vials & Caps. • Inserts. • Headspace Vials. • Convenience Kits & Crimpers 

However, substandard vials, caps, and septa can lead to sample loss, Easy selection based on volume, sample type, ... Aijiren Vial compatibility .