To get reproducible results it is very important that the headspace vials and caps form a tight seal. In headspace analysis, the sample is sealed into the vial 

2 mL Glass Crimp Top Vial and 11 mm Crimp Top, 2 mL Glass Screw Top Vial 9 mm Screw Caps 

However, substandard vials, caps, and septa can lead to sample loss, We also recommend a crimp-cap vial if you are working with volatile compounds.

Headspace Vials ND18 ND20. What is GC Headspace? Simple Definition. 'Headspace' is the gas space above the sample in a chromatography vial. Volatile sample.

Headspace Vials & Accessories. Products (1) · Categories (6). 1 - 12 of 16. 20ml ND18 Headspace Screw Vial (clear), 75.5 x 22.5mm, rounded bottom, 

The headspace vials are made to withstand higher temperatures and internal pressures required for volatile gas analyses. They have very low metal content, 

The Micro-QTTM Valve is designed exclusively for “through the valve” sampling . This valve is optimized for volatile or even light semivolatile compounds when 

Tisch 20mm crimp top vials have a volume of 20mL and provide an excellent seal for long term sample storage and analyses involving high volatile solvents.