Glass rubber stopper
Glass rubber stopper also known as laboratory rubber stopper, rubber bung and a rubber cork is most commonly used in laboratories to close test tubes and other places where there are chemicals and similar substances that must not evaporate because they can be toxic and because they can lose their characteristics. Glass rubber stoppers are ideal to get a tight seal very easily because with the help of a glass rubber stopper of the appropriate size, the entrance to any glassware will be completely closed and you will know that both you and the substances are safe.
They are not only used for laboratory purposes, but are also used in other places, most often in wineries. Glass rubber stoppers can be used for the fermentation process and are therefore popular in wineries. They can also be used for fermentation of other types of food and drinks, if the fermentation takes place in glass jars and bottles. In this case, it is important that the glass rubber stopper be of a specific type of rubber that is suitable for contact with food. Natural rubber and silicone rubber are recommended for food contact, while even more durable rubber types such as FKM are used for laboratory use. FKM has high chemical stability and can therefore be used in environments where chemicals, acids and other highly abrasive agents are present.
The sizes in which you can find glass rubber stopper vary greatly because laboratory glassware as well as winery equipment can be found in a wide variety of sizes. That’s why we adjust the size of the glass rubber stopper, so that it can be a perfect fit for every type of flasks, test tubes and so on. Whether used in the laboratory or in the fermentation process, the glass rubber stopper must be a perfect fit so that chemicals do not evaporate or the fermentation process is stopped. So if there is no available size you need, order a custom glass rubber stopper.
Stopper & Plug Size Catalog
Compare four stopper profiles and check the selected part dimensions against your opening and available depth. Each profile has its own drawing and dimension meanings.
Custom colors are available to your Pantone color code. Include the code in your inquiry.
RST T-Shaped Plugs
Match stem diameter A, flange diameter B, stem length C and flange thickness D. E refers to the underside recess; use the selected row and approved drawing to confirm the actual profile.
RSA Tapered Corks
Compare large-end diameter A, small-end diameter B and Height, in mm. The mating bore and required seating depth determine where the taper contacts the opening.
RSB Undercut Plugs
Compare neck diameter A, flange diameter B, flange-to-lip distance C and flange thickness D. Check panel thickness and rear clearance. E refers to the underside recess.
RSD T-Shaped Stoppers
Compare stem diameter A, flange diameter B, stem length C and head thickness D, in mm. Check the seating surface and available depth as well as the hole diameter.
Need a different fit? Share the opening dimensions, mating profile and intended use for a custom size.
Discuss Your RequirementsProduct specifications
- Product form
- Removable closure fitted inside an opening
- Material options discussed
- Silicone, FKM and natural rubber / latex. Choose one formulation for the actual contact and loading conditions.
- Application focus
- Laboratory vessels, test tubes, bottle necks and laboratory flasks. Size the part against the selected assembly.
- Dimensions to confirm
- Opening diameter, closure profile, insertion depth and exposed grip. Match these to laboratory vessels and test tubes.
- Contact conditions
- Food ingredients and acids: define concentration, temperature and contact time, then check compatibility with the chosen compound.
- Exposure to evaluate
- Rubbing or abrasion. 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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