Custom manufacturing example · Custom NBR Neoprene EPDM silicone rubber stopper plug

CUSTOM RUBBER & SILICONE MANUFACTURING

Custom NBR Neoprene EPDM silicone rubber stopper plug

A custom component for your assembly.

Define the mating surfaces, dimensions and working conditions. ETOL manufactures the part to the agreed design and material.

Factory direct
Made to order
Drawing & sample support

Share the part, its application and your estimated quantity.

Customize the fit, material and finish

Vulcanization workshop illustration with green molding presses and blue collection bins

Material & hardness

Selected for the contact, temperature and movement

Color & finish

Define the visible surfaces and intended color

Shape & dimensions

Develop holes, lips and walls around the mating parts

Mounting & fit

Match the attachment and installation method

Product Overview

A stopper plug can be molded in different rubber formulations, with NBR, neoprene, EPDM, and silicone representing distinct options for the application. The same outside shape does not make those materials equivalent under every fluid, temperature, or cleaning exposure. Material choice should follow the conditions at the actual closure.

Define the mating geometry separately: opening size, wall thickness, insertion depth, and removal access all influence the fitted profile. If a head or shoulder locates the plug, check that nearby components do not prevent it reaching its intended position. Avoid using the visible top diameter as the only selection dimension.

Evaluate the chosen configuration in the complete joint for its required sealing and retention behavior. During reuse, inspect for swelling, cuts, or a lasting change in shape, then consider whether exposure or mechanical fit is responsible. A replacement selected only by color or general rubber name may not preserve the original formulation. Conversely, changing material will not correct a burr or an incompatible retaining groove in the opening.

Material options: Custom silicone or EPDM / NBR / neoprene formulation; select the compound alongside the mating geometry.
Hardness selection: Silicone: 20–80 Shore A; solid rubber: 30–90 Shore A. Define the mating geometry separately: opening size, wall thickness, insertion depth, and removal access all influence the fitted profile.
Custom geometry: Avoid using the visible top diameter as the only selection dimension.
Fit evaluation: Evaluate the chosen configuration in the complete joint for its required sealing and retention behavior.
Color & OEM: Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. changing material will not correct a burr or an incompatible retaining groove in the opening. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.

Choosing a material or hardness? Explore the selection guide →

From part requirements to production

Define the part

Identify key dimensions, mating surfaces and quantity

Review material & tooling

Agree the compound and manufacturing approach

Evaluate the sample

Review the fit and agreed requirements in the assembly

Produce & inspect

Manufacture and check against the approved requirements

Review the intended assembly

Working conditions

Identify temperature, contact fluids and repeated movement.

Material and structure

Consider hardness together with wall thickness and support.

Installation

Check access, mating dimensions and the fitting sequence.

Ordering this custom component

Can the shape be adjusted to my mating parts?

Yes. Show the receiving opening, contact surfaces and clearance limits. We can review the dimensions and retaining features around the intended fit.

Which details should be agreed before tooling?

Agree the critical dimensions, material, hardness, visible surfaces and sample requirements. Explain how the part is installed and which interfaces control its function.

Can a sample help define the replacement?

A sample can help explain the structure. Compare it with the assembly because wear, swelling or compression may have changed its original dimensions.

How is the quotation for this part determined?

The material, part geometry, tooling, quantity and finishing affect the quotation. Include the intended batch size and delivery destination when describing your requirements.

DISCUSS THIS COMPONENT

Describe the part you need.

Share the fit, operating conditions and quantity with our manufacturing team.