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

Vials, 20mL Headspace vial only, Crimp Cap Style, 75,5 x 22.5mm, clear glass, Round bottom, 100/pk.

20mL Clear, Crimp Neck Headspace Vial, ND20 Round Bottom, 22.8x75mm, 100/pk, Clear color provides for an unhindered view of the solution to observe any ...

Butyl/PTFE septa are an economical choice with low background peaks. Wheaton headspace vials accept 20 mm aluminum seals Rounded shoulders and bottoms ...

Package of 20mL clear headspace round bottom vials with 20mm aluminum crimp caps (silver in color) and Silicone/PTFE Septa. Cap: Aluminum 20mm Crimp Cap.

Headspace vial, screw top, rounded bottom (vial only) volume 20 mL, amber glass vial, thread for 18, O.D. × H 22.5 mm × 75.5 mm, pkg of 100 ea; 

LabZhang 100pcs 10ml Vials-Glass Clear Bottom Headspace Vial with Plastic-Aluminum Flip Off Caps and Rubber Stoppers,Transparent Glass Headspace Vials,10ml 

10ml Vials-Transparent Glass Headspace Vials with Plastic-Aluminum Flip Off Caps and Rubber Stoppers, 100 Pack, 20mm Flat Bottom Lab Vial (Transparent)

Use these 6, 10, and 20 mL SureSTART Glass Crimp Top Headspace Vials, Performance Level 3, for your volatile gas analyses.

Material, color, glass, clear, glass, clear. Neck, crimp, crimp. Head O.D. [mm], 20, 20. Bottom, round, round. Dimension [mm], 46.0 x 22.5, 75.5 x 22.5