Rubber vial stopper
Rubber vial stopper is located on almost every glass or plastic vessel or bottle, which is used to store medications or other similar substances, which must be protected from the negative effects of oxygen and other external factors. Although there is no specific regulation or law that obliges manufacturers of drugs and chemicals to use rubber vial stoppers to close vials, most of them implement rubber vial stoppers, as nothing can protect substances from moisture, for example, as good as this type of rubber stopper can.
Whether pharmacotherapy is in the form of capsules, liquids or powders, it is equally important to protect it against things that can change the chemical composition of medications. In some cases, medications will only lose their effect, and in some cases they can become dangerous. It is therefore advisable to use a rubber vial stopper to create a hermetically sealed environment where the drugs will be able to remain in their unchanged form for a long time.
It is important to know the diameter as well as the depth of the part of the vial where the rubber vial stopper will be located. It is necessary that the size of the stopper is such that it barely fits in the vial, in order to prevent any passage of oxygen, liquid or any other substance that should not come into prolonged contact with your medication. You can order any size from us, so you don’t have to worry even if the vial is some non-specific size.
Choose the color of rubber vial stopper if you have numerous vials with different medications. This will make it much easier for you to tell where each medication is, without having to label the vial in any other way or remember which form the medicine takes. It can also be potentially dangerous if many drugs look similar.
Our Butyl Stoppers Size Chart
Bottle Stopper Size Catalog
Compare the listed butyl stopper dimensions against the bottle opening and seating arrangement. Confirm the selected profile using the part drawing.
Custom colors are available to your Pantone color code. Include the code in your inquiry.
Butyl Rubber Stopper(Anaerobic bottle stopper)
Compare A, B, C, D and E in mm against the selected stopper drawing. The illustration shows a related profile; confirm the precise underside and fit before specifying the part.

Need a different size? Share your drawing, mating dimensions and intended use to discuss a suitable part.
Discuss Your RequirementsProduct specifications
- Product form
- Vial or bottle closure matched to its neck finish
- Application focus
- Vials and bottle necks. Size the part against the selected assembly.
- Dimensions to confirm
- Vial neck bore, sealing flange, plug depth and any crimp-cap interface. Match these to vials and bottle necks.
- Contact conditions
- Medicinal contents, oxygen and dry powders: define concentration, temperature and contact time, then check compatibility with the chosen compound.
- Exposure to evaluate
- Moisture. Validate the selected material under the combined conditions.
- Seating check
- Check the sealing contact around the opening and the force needed for insertion and removal.
Need a quote or a custom part?
Send your requirements, drawings or samples to discuss standard and custom silicone rubber parts.
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