Custom square rubber seal washers/soft silicone seal gasket

Custom square rubber seal washers follow a sealing area with straight sides and corners. The soft silicone configuration should match the mating profile and the available compression space. Corner geometry deserves the same attention as side length, because the gasket must sit naturally around the entire sealing path.

Check the inner and outer corners against the actual seat. A tight radius can stretch the rubber locally, while an oversized corner can bunch up when the joint closes. The washer should lie flat without being pulled into shape by the fasteners. Review the secured assembly for continuous support and clearance from adjacent openings.

Choose the compound around the contact medium and operating conditions. Softness alone does not establish a sealing capability or compensate for a mismatched joint. Before fitting, remove residue from the seat and protect the corners from sharp tools. During service, inspect any region that shows repeated pinching or displacement, since the underlying seat may need attention before a new gasket is installed.

Material options

Silicone. Custom formulation and color for the intended contact conditions.

Hardness selection

Silicone: 20–80 Shore A. The soft silicone configuration should match the mating profile and the available compression space.

Custom dimensions

Review the secured assembly for continuous support and clearance from adjacent openings.

Fit & assembly

Check the inner and outer corners against the actual seat.

Use & inspection

During service, inspect any region that shows repeated pinching or displacement, since the underlying seat may need attention before a new gasket is installed.

Photos illustrate structure or material only. A tight radius can stretch the rubber locally, while an oversized corner can bunch up when the joint closes. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.