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20 mm crimp headspace vials (ND20)

Crimp-top headspace vials with a 20 mm neck: 6 ml (22 × 38 mm), 10 ml (22.5 × 46 mm) and 20 ml (22.5 or 22.8 × 75.5 mm), with flat or round bottoms, in clear and amber glass.

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Compare 20 mm crimp headspace vials (nd20)

Rows that differ are in bold.

Start from your autosampler: it decides the vial size and neck. Then pick the glass colour and the cap.

Step 1: Neck size and closure

NeckClosureTypical use
9 mm short thread (9-425)Screw cap with septumThe most common HPLC format; wide opening, easy to fill
8 mm (8-425)Screw cap with septumOlder and some specific autosamplers
10 mm (10-425)Screw cap with septumSpecific autosampler models
11 mm crimp or snapAluminium crimp cap or snap capGC and volatile samples (crimp seals tightest)
18 mm and 20 mmMagnetic screw or crimp capHeadspace GC

Standard 2 ml vials measure 11.6 × 32 mm (often written 12 × 32 mm). Check the vial format in your autosampler manual; a free sample lets you test the fit in your rack.

Step 2: Clear or amber glass

Use amber glass for light-sensitive compounds. Use clear glass for everything else, so you can see the fill level and any particles.

Step 3: Caps and septa

PTFE/silicone septa suit most HPLC and GC work and reseal for repeat injections. Pre-slit septa reduce needle wear and stop a vacuum forming in the vial. Order caps and vials together: on EROHE, equal packs of 9 mm vials and caps get 5% off both.

Step 4: Small sample volumes

For volumes under 1 ml, use a glass insert in a standard vial, or a vial with a built-in conical insert, so the needle can still reach the sample.

Questions buyers ask

Which caps fit 20 mm crimp headspace vials?

20 mm aluminium crimp caps (ND20), including magnetic and pressure-release versions, with PTFE/silicone or PTFE/butyl septa.

Why are there two 20 ml vial diameters, 22.5 and 22.8 mm?

Headspace samplers have different tolerances for vial diameter. Check the dimensions in your sampler manual and order the matching vial.

Which septum suits headspace work at high temperature?

PTFE/silicone septa are listed for up to 200 °C. PTFE/butyl septa have lower gas permeability but are listed for up to 120 °C.