Crimp top headspace vials: Clear glass headspace vial for GC autosampler. Specially manufactured to provide uniform glass thickness which ensures uniform heat distribution for consistent sampling reliability. EPA/VOA/Storage vials: CHMLAB offers many standard vials and vial kits for volatiles sampling, compound storage and other non-chromatography applications. In addition, most products can be deactivated and/or packaged for special applications (package of a biological agent, cosmetics, high-value chemistry, etc.)