OEM round flat food grade silicone gasket rubber rings for jars

Flat rubber rings for jars provide a contact layer between the jar and its closure. Their width should suit the available sealing land without projecting unnecessarily into the opening or beyond the lid. The ring's relaxed dimensions are the useful reference when developing a custom size.

For this silicone design, consider how the lid moves during closing. A turning or clamping action can drag the ring if it is not adequately located, leaving a folded section that is difficult to see afterward. Evaluate the jar and lid together using the intended closure method.

Choose the silicone formulation for the food or liquid involved and the expected cleaning conditions. Before fitting, remove residue from the jar rim and the ring's two flat faces. After closure, check the visible perimeter for an uneven projection that could indicate displacement. A jar used in a different storage orientation or process should have its sealing performance assessed for that condition. Replace rings with cuts or lasting distortion rather than trying to hide a damaged area deeper beneath the lid.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. For this silicone design, consider how the lid moves during closing.

Custom dimensions

The ring's relaxed dimensions are the useful reference when developing a custom size.

Fit & assembly

After closure, check the visible perimeter for an uneven projection that could indicate displacement.

Use & inspection

Replace rings with cuts or lasting distortion rather than trying to hide a damaged area deeper beneath the lid.

Photos illustrate structure or material only. A turning or clamping action can drag the ring if it is not adequately located, leaving a folded section that is difficult to see afterward. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.