Rubber bung stopper
The main purpose of a rubber bung stopper is to plug tubes, flasks, bottles, and basically any type of container. Naturally, these items are made of rubber, which is obvious, and due to the material properties, they are used in several industries. When it comes to the design, a rubber bung stopper has trapped edges, meaning that top is wider than the bottom. This feature enables you to easily insert it into a bottle and plug it from the outside without distributing its content or decreasing the volume.
Now, when choosing these, the size is the most important thing you have to consider before putting in your order. Why? Well, the rubber bung stopper must fit the hole perfectly to seal the container completely and protect its content. Even though rubber is a flexible material, the chances are that you won’t be able to use the stopper that is too big. On the other hand, the smaller one won’t work either. You may be able to fit it somehow, but even if you manage to do this, you should think of it as a temporary solution until you have a chance to purchase the one you actually need. Since it is vital to use one of the appropriate dimensions, we offer a whole range of different rubber bung stoppers to our customers.
In addition, you also have to investigate the material itself. Naturally, to make the best choice, you have to consider where you will store the containers, as well as the content they hold. For example, if the bottle holds harsh chemicals, you should go with FKM and Neoprene items that are resistant to high temperatures and strong acids. On the other note, if the stopper will be in direct contact with food, you should choose silicone ones that are safe and eco-friendly.
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, chloroprene rubber (CR) and FKM. Choose one formulation for the actual contact and loading conditions.
- Application focus
- Laboratory flasks and bottle necks. Size the part against the selected assembly.
- Dimensions to confirm
- Opening diameter, closure profile, insertion depth and exposed grip. Match these to laboratory flasks and bottle necks.
- Contact conditions
- Acids and food ingredients: define concentration, temperature and contact time, then check compatibility with the chosen compound.
- 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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