Custom Rubber Stopper
Custom rubber stoppers and bungs engineered to your exact specifications—any size, any shape, and any material for a guaranteed leak-proof seal.
Custom Molded Rubber Stopper
Flexiparts makes custom rubber stoppers according to your drawings. Using our in-house molding and production capabilities, we produce stoppers that resist chemicals, high pressure, and extreme temperatures. Your stoppers can be any size, shape, material, hardness, or surface finish—built to meet your exact requirements and solve sealing problems standard stoppers can’t.
Getting a custom rubber stopper solution is simple — send us your drawing or sample, and we’ll handle mold design, quoting, and production. Contact us anytime via our website, email, or phone to start your project.
Rubber Stopper Solutions Built to Your Needs
Flexiparts manufactures rubber stoppers and plugs according to your drawings, offering a wide range of sizes, shapes, and materials to meet the specific needs of laboratory, medical, and industrial applications.
*Please note: The molded rubber parts shown below are not in stock — these parts were Flexiparts Plastics customized for other customers.
LET’S START A NEW CUSTOM RUBBER PARTS
Tell us your requirement, our engineers help you make it a reality!
Rubber Stopper Plug Design Suggestions
When customizing rubber plug stoppers, pay attention to the fit (taper angle and diameter) and chemical compatibility. The stopper’s dimensions (top diameter, bottom diameter, and length) must match the opening perfectly to ensure a leak-proof seal under the operating pressure or vacuum. Choose materials that are chemically inert to the substances they will contact and ensure the material meets any necessary certifications. Consider if the stopper needs to be solid or include a pre-drilled hole for tubes or sensors.Rubber Stopper Manufacturing Methods
- Compression Molding
- Injection Molding
- Overmolding
Material
Our custom rubber blocker stoppers are available in a variety of high-performance elastomers:
- Silicone (MVQ)
- Butyl Rubber (IIR)
- Ethylene Propylene Diene Monomer (EPDM)
- Nitrile (NBR)
- Fluoroelastomer (FKM)
Benefit
- Create reliable, leak-proof seals in bottles, vials, and industrial ports.
- Available in tapered or stepped designs for optimum sealing retention.
- Resistant to chemicals, solvents, and temperature extremes.
- Materials available for high-purity (e.g., medical/food grade) applications.
- Can be supplied solid or pre-drilled for tubes, wires, or venting.
- Durable and suitable for use under vacuum or light pressure.
Application
Rubber stoppers and plugs are widely used across multiple industries:
- Laboratories and Research: Sealing flasks, test tubes, and glassware.
- Pharmaceutical and Medical: Sealing vials and fluid containers (septum stoppers).
- Chemical Industry: Protecting ports and containers from contamination.
- Industrial Manufacturing: Temporary or permanent sealing of hydraulic or pneumatic lines.
- Food and Beverage: Sealing specialized tanks or equipment.
Related FAQs of Rubber Stoppers
What is the best material for laboratory stoppers?
We supply various elastomers such as silicone, EPDM, or butyl. Material selection depends on your application—temperature, chemicals, or vacuum requirements.
Can custom rubber stoppers be produced in different hardness or colors?
Silicone (MVQ) and FKM resist high temperatures and maintain flexibility. We can supply washers in these materials.
Do you offer stoppers with integrated metal inserts or threaded features?
Yes. We can produce custom rubber stoppers with metal inserts, threaded features, or other special requirements as per your drawings.
Are custom stoppers easy to install and remove without damaging the equipment?
Yes. Our stoppers are precision molded to ensure proper fit, making installation and removal safe and easy without harming your equipment.
What measures prevent deformation during transport or storage?
We recommend storing stoppers in a cool, dry place away from direct sunlight and ozone. Our production ensures consistent shape and hardness for minimal deformation.
What Our Customers Say
Check what our customers say about us, why they like to work with us!
Flexiparts pays attention to detail. We’re happy with their plastic and rubber molds. Communication is fast and efficient, and their support is great.
Edward
France
Working with Flexiparts has been great. The injection-molded parts are always top quality. We really appreciate your professionalism with delivery and project management
Bella
US