High quality square rubber washer and gasket for sealing

A square rubber washer needs adequate support along its sides as well as through the corners. The custom gasket outline should follow the mating faces, with the inner opening and outer boundary defining the working width. Thickness should suit the designed closing gap.

Check for local recesses or fastener features that interrupt the supporting surface. A broad-looking washer may have less useful contact if part of it bridges a gap. The ring should settle naturally in its seat without being pulled into place at one corner.

Select the material for the actual temperature and substances. Install on clean surfaces and inspect all four sides before closure. Use the assembly's intended sequence so that one region is not displaced while another is already held. During maintenance, remove deposits from the seat and examine the washer for cuts or uneven permanent compression. Replace with the matching outline and section rather than adding width or thickness without checking the underlying contact geometry.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. Coordinate rubber compliance with the working width between the inner opening and outer boundary; evaluate compression across that supported strip.

Custom dimensions

Use the assembly's intended sequence so that one region is not displaced while another is already held.

Fit & assembly

Check for local recesses or fastener features that interrupt the supporting surface.

Use & inspection

During maintenance, remove deposits from the seat and examine the washer for cuts or uneven permanent compression.

Photos illustrate structure or material only. The custom gasket outline should follow the mating faces, with the inner opening and outer boundary defining the working width. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.