Custom manufacturing example · Custom durable square rubber seal/rubber silicone gasket

CUSTOM RUBBER & SILICONE MANUFACTURING

Custom durable square rubber seal/rubber silicone gasket

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 square rubber seal follows an angular contact path where a circular ring would not match the assembly. The custom outline can accommodate the opening and the available seating width, while the thickness is chosen around the closed joint. The corners are functional portions of the seal, not simply transitions between straight sides.

Fit the part without pulling the sides outward to make the corners reach. Stretching can narrow the cross section and create uneven contact when the cover is tightened. Corner radii should correspond to the receiving shape, leaving the seal supported rather than trapped against a sharp internal edge.

Before closing the assembly, confirm that all four sides lie flat and that any locating features are engaged. Tightening should bring the mating faces together evenly, especially where fasteners sit near the corners. Choose silicone or another suitable rubber compound for the actual environment. When inspecting a used seal, compare corner condition with the straight sections; a local fold or flattened turn can explain a problem that is not visible along the sides.

Material options: Silicone. Custom formulation and color for the intended contact conditions.
Hardness selection: Silicone: 20–80 Shore A. Before closing the assembly, confirm that all four sides lie flat and that any locating features are engaged.
Custom dimensions: The custom outline can accommodate the opening and the available seating width, while the thickness is chosen around the closed joint.
Fit & assembly: Corner radii should correspond to the receiving shape, leaving the seal supported rather than trapped against a sharp internal edge.
Use & inspection: When inspecting a used seal, compare corner condition with the straight sections; a local fold or flattened turn can explain a problem that is not visible along the sides.

Photos illustrate structure or material only. The custom outline can accommodate the opening and the available seating width, while the thickness is chosen around the closed 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.