Vial caps & septa

PTFE/silicone is the general choice for HPLC and GC and reseals well after several injections. PTFE/rubber is economical but reseals less well. Butyl has low gas permeability and is often used for headspace. Pure PTFE septa are meant for a single injection only. Test reseal over your usual injections. Compare septa for GC in GC liners, septa, syringes and accessories. Unsure which one fits? Ask sales@luminixhealth.com.

ND stands for the nominal neck diameter of the vial in millimetres. The cap type, screw, crimp or snap, must match the neck of the vial, and the ND value must be the same on both. Check the ND value on the product page of the vial and of the cap before ordering. Common ND sizes for autosampler vials are 8, 9 and 11 mm; headspace vials usually have ND 18 or 20. See autosampler vials and crimpers and decappers. Need advice for your set-up? Mail sales@luminixhealth.com.

A pre-slit septum reduces the risk of a vacuum forming in the vial and lowers needle wear, which helps with several injections from the same vial. A septum without a slit seals better and limits evaporation, so it suits volatile samples and storage before analysis. Choose by sample volatility and number of injections. Compare options in vial caps and septa. For a quote or a second opinion, write to sales@luminixhealth.com.

Some automated systems, especially headspace samplers, pick up the vial with a magnet. In that case you need magnetic screw or crimp caps, otherwise the vial is not transported. For other autosamplers, standard caps are sufficient. Follow the manual of your own instrument, which states the cap type it requires. Check that your autosampler accepts magnetic caps. Magnetic and standard versions are in vial caps and septa. Questions about a specific product? Contact sales@luminixhealth.com.

A vial cap and a septum have to match the vial neck: crimp, screw or snap, and the diameter. The septum material, PTFE/silicone or rubber, decides chemical resistance and how many times a needle can pierce it. A septum that sheds into the solvent becomes ghost peaks.

An autosampler vial is the small closed bottle a chromatograph picks up. The neck is crimp, screw or snap, and the cap and the septum have to be that neck. The septum is the part the needle pierces. A soft septum reseals. A septum that is wrong for the solvent swells or sheds particles into the sample. Inserts reduce the volume when the sample is scarce. The separation they feed is described with IUPAC names and PubChem data.

This shelf belongs to Vials, caps & septa, inside Chromatography equipment. Luminix Health distributes this range for laboratory use.

The neighbouring shelves are Chromatography accessories, Autosampler vials, Crimpers & decappers and Vial inserts. The category above this shelf is Vials, caps & septa.

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