Custom manufacturing example · Round flat rubber gasket EPDM NBR SBR seals

CUSTOM RUBBER & SILICONE MANUFACTURING

Round flat rubber gasket EPDM NBR SBR seals

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 Round flat rubber gasket creates an annular contact between matching planar surfaces. The flat section should be chosen around the supported sealing area and available closed height. A circular outside shape alone does not mean the part can replace a different ring section in a shaped groove.

EPDM, NBR and SBR are distinct compound families. Select the particular material according to the joint's medium, temperature and cleaning conditions, then develop the inner diameter, outer diameter and thickness around the assembly. The contacting faces should support the rubber without leaving a narrow edge suspended over the opening.

Place the gasket centrally before the joint is secured. Inspect for a shifted bore or a fold at the edge rather than relying only on the visible outer circle. During replacement, compare the intended thickness with the used part, which may remain compressed after removal. Correct damaged or contaminated faces before fitting another gasket so the replacement begins with the contact conditions required by the design.

Material options: EPDM / NBR / SBR. Custom formulation and color for the intended contact conditions.
Hardness selection: Rubber: 30–90 Shore A. Compare EPDM, NBR or SBR grades with the flat ring centered; check compression at the bore as well as the visible outer edge.
Custom dimensions: The flat section should be chosen around the supported sealing area and available closed height.
Fit & assembly: Select the particular material according to the joint's medium, temperature and cleaning conditions, then develop the inner diameter, outer diameter and thickness around the assembly.
Use & inspection: Correct damaged or contaminated faces before fitting another gasket so the replacement begins with the contact conditions required by the design.

Photos illustrate structure or material only. The contacting faces should support the rubber without leaving a narrow edge suspended over 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.