Custom manufacturing example · Silicone rubber sealing washer/ flat rubber seal rings

CUSTOM RUBBER & SILICONE MANUFACTURING

Silicone rubber sealing washer/ flat rubber seal rings

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 silicone rubber sealing washer places a flat contact band around an opening in a mating joint. The band needs enough supported width to remain positioned as the faces close, while the central opening stays clear of the intended passage. Choosing the washer by outer diameter alone can overlook both of those requirements.

Check the inner diameter, thickness, and shape of the supporting faces. A recess or shoulder beneath part of the washer can create uneven compression across its width. Select the silicone formulation around the contacting medium, operating temperature, and expected opening cycle.

Center the washer before tightening and keep it from being dragged by rotating hardware. Inspect the exposed edge for spreading outside the intended seat. Where the part performs a sealing duty, evaluate the complete joint under its actual conditions. During service, examine the old contact band for a cut or flattened region that corresponds to the surrounding hardware, and correct that surface condition before fitting a replacement of the intended size.

Material options: Silicone. Custom formulation and color for the intended contact conditions.
Hardness selection: Silicone: 20–80 Shore A. A recess or shoulder beneath part of the washer can create uneven compression across its width.
Custom dimensions: The band needs enough supported width to remain positioned as the faces close, while the central opening stays clear of the intended passage.
Fit & assembly: Check the inner diameter, thickness, and shape of the supporting faces.
Use & inspection: During service, examine the old contact band for a cut or flattened region that corresponds to the surrounding hardware, and correct that surface condition before fitting a replacement of the intended size.

Photos illustrate structure or material only. A Silicone rubber sealing washer places a flat contact band around an opening in a mating joint. 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.