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Vial Caps
Vial caps ensure the tight closure of a vial and must be selected to match the diameter and closure type of your vial. Here you will find suitable caps for screw top, crimp top and snap ring / snap cap closures with a selection of different materials from plastics to aluminium.
Please also note that many caps are available as closed versions or with an opening for a septum. Often caps are also sold directly in combination with compatible septa.
Technical Data
What types of seals are there and what are their advantages?
Screw top
The screw top is based on a short thread and can be closed and opened by hand. The thread gives these vials a high seal, making them a suitable choice for volatile compounds or longer storage times. Screw caps are widely used, compatible with many systems and can also be used for headspace applications.
Screw caps are typically made from polypropylene and are available as a closed cap or with an opening for use with a septum.
Crimp top
With a "crimp top" closure, the lid is crimped onto the edge of the container using special pliers, which results in a high level of tightness and robustness. These closures are therefore extremely pressure-resistant and secure, making them the standard among headspace vials. Volatile compounds can also be handled well. One disadvantage is that the vials are difficult to open and cannot be resealed.
Caps for this type of closure are typically made of metal (aluminium or magnetic steel) and are intended for use with a septum.
Snap ring / snap cap
"Snap ring" and "snap cap" are two types of snap locks that can be opened and closed very easily by hand. The cap and vial can be resealed as often as required and handling is simple. However, this type of closure has a comparatively poor seal and is not suitable for volatile compounds or headspace vials.
Snap caps are usually made of polyethylene and are available as closed caps or with an opening for septa.
Pliers for "crimp top" closures can be found under accessories. Please also visit our page on the subject of septa.
How do I choose a suitable vial?
If you are still unsure about the right choice of vial for your application, or need more information about vials, please visit our page on the subject of vials.
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