Crimp-Top GC Vial

What is the Crimp-Top GC Vial?

A crimp-top GC vial uses an aluminium crimp seal with a low-bleed septum for gas chromatography. It gives a uniform seal and low background in volatile analysis, with an aluminium crimp seal and low-bleed septum.

Overview

The vial is made from borosilicate glass, usually in 1.5, 2 or 4 mL sizes, with a crimp neck finish and an aluminium cap holding a septum. PTFE-faced silicone or a low-bleed septum is used because silicone rubber can release siloxanes at high injector temperatures, producing background peaks in the chromatogram. Crimping with a correct tool gives an even seal around the neck, which resists evaporation better than some screw caps and is preferred for long autosampler runs and volatile analytes. Vials may have a graduated writing patch, and inserts are available for small volumes. The seal is single use, since removing a crimp cap damages it, and a consistent crimp height is needed so the autosampler can grip the vial reliably.

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, 1.5–4 mL
• Aluminium crimp seal
• Low-bleed PTFE-faced silicone septum
• Uniform seal for long runs
• Graduated writing patch
• Inserts for small volumes

What are the technical specifications?

A typical crimp-top gc vial configuration offers material of Borosilicate glass, volume of 1.5–4 mL, closure of Aluminium crimp, septum of Low-bleed PTFE-faced silicone, crimp height of Controlled and background of Low siloxane. 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 Crimp-Top GC Vial is used in GC and GC-MS injection, residual solvent analysis, volatile organic compounds and fragrance and flavour work. 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 Crimp-Top GC Vial?

Choose crimp vials with a low-bleed septum for GC work where background peaks matter, and use consistent crimping. RFQ: volume, septum type, crimper, inset needs and autosampler model. Provide volume, septum, crimper and existing autosampler model.

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.