Headspace Vial

What is the Headspace Vial?

A headspace vial is a sealed glass vial designed to hold a sample and its vapour for gas chromatography. It is crimped or screw capped and rated for the sampler's pressure and temperature.

Overview

The vial is made from clear or amber borosilicate glass in 10, 20 or 22 mL sizes, with a crimp or screw cap and a butyl or PTFE-faced silicone septum. It is designed to be heated in a headspace sampler so volatile compounds partition into the gas phase, then a needle withdraws a gas sample for GC analysis. The vial and cap must hold pressure at the sampler temperature, commonly 40–150 °C, and the septum must reseal after repeated piercing if multiple injections are made. Fill level matters because it sets the headspace to sample ratio, which affects sensitivity and reproducibility, and vials are usually filled about one third to one half for headspace. Consistent crimping or torque is essential, since a small leak changes the partition and biases results. Magnetic caps or specific neck finishes may be required by the sampler.

How does it work?

A sample vial holds a small volume of liquid or headspace gas and is pierced by the autosampler needle through a septum. The vial material must not leach into or adsorb from the sample, so glass, usually borosilicate or Type I, is preferred for organic solvents and trace analysis, and polypropylene is used for aqueous and inorganic samples. The septum is the critical part: silicone, PTFE-faced silicone, butyl or natural rubber are chosen for chemical compatibility, resealing ability and pierce count. The cap and crimp or screw thread must hold the septum flat so no leak or evaporation occurs, because even small losses change concentrations over a long run. Surface treatment and low-adsorption glass help with polar or basic analytes, while amber glass protects light-sensitive compounds. Dimensions follow recognised standards so vials fit autosampler trays and magazines reliably.

What are the key features?

• Borosilicate glass, 10–22 mL
• Crimp or screw cap
• Butyl or PTFE-faced silicone septum
• Rated for 40–150 °C headspace use
• Clear or amber glass
• Magnetic cap option

What are the technical specifications?

A typical headspace vial configuration offers material of Borosilicate glass, volume of 10–22 mL, closure of Crimp or screw, septum of Butyl or PTFE-faced silicone, max temperature of 150 °C and fill level of 1/3 to 1/2 of volume. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Headspace Vial is used in residual solvent testing, flavour and aroma analysis, blood alcohol and toxicology and environmental volatiles. Across the wider Vials class, laboratories also deploy it for HPLC and UHPLC autosampling, gas chromatography injection and headspace analysis.

Which standards and certifications apply?

Relevant standards and methods include USP <660> (glass containers), EP 3.2.1 (glass containers for pharmaceutical use), ISO 8362 (injection containers and accessories), USP <661> (plastic components and systems), USP <1664> (assessment of drug product leachables) and GHS labelling requirements. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Fill vials to the recommended level, usually 50–75 % of the volume, so there is enough headspace for the autosampler and no sample is lost to the septum, and never overfill, because pressure can force liquid out or distort the septum. Use the correct crimp tool and torque, since a loose or over-tightened cap leaks or deforms the septum. Discard vials with damaged septa or distorted caps, and avoid reusing septa, because piercings do not reseal perfectly. Store standards in vials with minimal headspace, seal them well and use amber glass for light-sensitive compounds. Check that vials meet dimensional standards so they do not jam the autosampler, and use only the septa validated for the method, because a different septum can introduce new peaks.

How do I select the right Headspace Vial?

Choose headspace vials that match the sampler's neck finish and pressure, with a septum that resists the sampler temperature. Confirm fill level and cap type. RFQ: volume, sampler model, temperature, septum and cap requirements. Provide the sampler model and septum type.

How does it compare with other Vials variants?

Choose the vial to fit the autosampler first, since tray and magazine dimensions are fixed, then choose the closure for the sample and the mobile phase. For reversed-phase HPLC with aqueous and organic mobile phases, a screw-top vial with a PTFE-faced silicone septum is common and convenient. For headspace analysis, use a vial rated for the pressure and temperature of the headspace sampler, with a septum that reseals after each of the several piercings. For GC, crimp-top vials with a low-bleed septum reduce background peaks. Choose amber glass for light-sensitive compounds, and low-adsorption or deactivated glass for basic and polar analytes that bind to active silanol sites. Confirm septum and cap compatibility, volume and any certification for trace metals or leachables, and check that inserts fit the vials and the autosampler needle.