Custom manufacturing example · Compress molding square silicone rubber gasket/rubber seal

CUSTOM RUBBER & SILICONE MANUFACTURING

Compress molding square silicone rubber gasket/rubber seal

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 silicone rubber gasket follows a joint with four sides and defined corner transitions. Its outline can place sealing material around a square opening without filling the central space. Corner shape deserves particular attention because the mating surfaces may have different radii even when their straight side dimensions appear to agree.

Choose thickness and section around the available closing gap. Fasteners positioned near the corners can apply force differently from fasteners spaced along the sides, making even closure an important part of the joint design. Leave adequate sealing width around any bolt holes so positioning errors do not expose a narrow or unsupported strip.

Lay the gasket onto the mating face without pulling the corners outward. Bring the opposite face down squarely and check that the perimeter remains located as the fasteners engage. Silicone selection should match the medium and working temperature; the geometry alone cannot establish suitability. On disassembly, look for corner tears or uneven flattening that may indicate alignment or compression needs to be corrected before the next installation.

Material options: Silicone. Custom formulation and color for the intended contact conditions.
Hardness selection: Silicone: 20–80 Shore A. Fasteners positioned near the corners can apply force differently from fasteners spaced along the sides, making even closure an important part of the joint design.
Custom dimensions: Corner shape deserves particular attention because the mating surfaces may have different radii even when their straight side dimensions appear to agree.
Fit & assembly: On disassembly, look for corner tears or uneven flattening that may indicate alignment or compression needs to be corrected before the next installation.
Use & inspection: Leave adequate sealing width around any bolt holes so positioning errors do not expose a narrow or unsupported strip.

Photos illustrate structure or material only. Fasteners positioned near the corners can apply force differently from fasteners spaced along the sides, making even closure an important part of the joint design. 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.