Erlenmeyer flask rubber stopper
Today we will try to inform you about one of our best-selling products, the Erlenmeyer flask rubber stopper. As its name suggests, an Erlenmeyer flask rubber stopper is envisaged to provide an air-tight seal for the container of the same name. Rubber proves to be an ideal material when materialization of such seal is in question, not only because it stops external influences from going in, but also for preventing the insides of the flask from exiting the controlled environment. Surely, different material combinations provide distinctive characteristics, therefore, it is of utter importance to draw your attention and make you aware that you can have a word when picking the raw materials for the Erlenmeyer flask rubber stopper is concerned.
Namely, by modification of standard recipe for Erlenmeyer flask rubber stopper, you can either potentiate or exclude specific features such as enhanced endurance, resistance to friction, consistency under exposure to extreme temperatures, etc. Besides features, you can also make amends when the shape and size are in question. Namely, we can both provide you with standard versions of the Erlenmeyer flask rubber stopper, or we can craft a customized version according to the design you provide to our support team.
Besides standard Erlenmeyer flask rubber stopper versions that make sure the content is kept within the container until you remove the stopper, we also offer permeable variants that are ideal for keeping specific materials that are unstable. Namely, the opening on the Erlenmeyer flask rubber stopper would let the gas leak out of the container if the pressure becomes too high, while the liquid residue will remain safely stored without risk of spillage due to a high-pressure environment. Therefore, speak your mind to the support team and expect them to get in touch with pieces of information you were asking for in record time.
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
- Application focus
- Erlenmeyer flasks 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 Erlenmeyer flasks and laboratory flasks.
- Contact conditions
- Air and other gases: define concentration, temperature and contact time, then check compatibility with the chosen compound.
- Exposure to evaluate
- Heat and cold cycling. 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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