Custom manufacturing example · Heat-resistant square rubber washer/rubber seal/gasket

CUSTOM RUBBER & SILICONE MANUFACTURING

Heat-resistant square rubber washer/rubber seal/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 washer can resist turning within a correspondingly shaped seat, but its corners must fit that seat's actual radii. A square opening in metal or molded plastic may have rounded internal turns that differ from the washer's visible outline. The corners should engage without becoming the only areas carrying contact.

Compare the straight sides and curved transitions separately. A washer that is stopped by its corners may appear located while its face remains above the intended seat. Conversely, excessive corner clearance can permit more movement than the design expects. Custom shaping should resolve these relationships before the part is clamped.

For warm service, choose the compound around the actual heat and contacted medium, without assigning a temperature limit from shape alone. Inspect corner contact after the assembly reaches its intended position. During maintenance, look for a folded tip or localized mark at a turn and compare it with the recess beneath. Reproduce the developed corner geometry in replacements rather than rounding off an incompatible washer by hand to make it drop into the opening.

Material options: Rubber. Custom formulation and color for the intended contact conditions.
Hardness selection: Rubber: 30–90 Shore A. Conversely, excessive corner clearance can permit more movement than the design expects.
Custom dimensions: A square rubber washer can resist turning within a correspondingly shaped seat, but its corners must fit that seat's actual radii.
Fit & assembly: Inspect corner contact after the assembly reaches its intended position.
Use & inspection: For warm service, choose the compound around the actual heat and contacted medium, without assigning a temperature limit from shape alone.

Photos illustrate structure or material only. A square opening in metal or molded plastic may have rounded internal turns that differ from the washer's visible outline. 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.