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9 mm screw vials (ND9)

2 ml and 0.3 ml vials with a 9 mm short-thread neck, 11.6 × 32 mm: borosilicate glass screw vials in clear and amber, vials with a built-in micro-insert, and polypropylene micro-vials.

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Compare 9 mm screw vials (nd9)

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 cap fits a 9 mm short-thread vial?

A 9 mm short-thread screw cap (ND9). The in-stock blue cap with a PTFE/silicone septum fits these vials, and equal packs of vials and caps get 5% off both.

When should I choose a polypropylene micro-vial?

PP vials suit samples that adsorb to glass, such as some proteins and peptides, and samples where glass ions are a concern. Glass is the better choice for most organic solvents.

What is a vial with an integrated micro-insert?

A one-piece 0.3 ml vial with the insert bonded to the base, so small samples sit within needle reach without a separate insert.

Is there a difference between the USP type 1 and the standard glass vials?

USP type 1 refers to borosilicate glass with high chemical resistance. Product names state where the vial is listed as USP type 1.