Flexible flat rubber seal silicone gasket for jar lids

A rubber gasket seal for jar lids can be molded in silicone and should stay in position while the lid is placed or turned into closure. The ring's flexibility can help it follow the seat, but excessive stretch or a loose retaining arrangement may let it shift. The lid and jar rim should be considered together.

Custom dimensions, hardness and color allow the flat seal to match the closure. Define the supported width and section thickness using the actual sealing land. Select the silicone formulation for the contents, temperature and cleaning conditions.

During fitting, work the gasket evenly around the seat and inspect for a rolled edge before closing the lid. Check that the ring has not projected unevenly from the perimeter afterward. Evaluate the finished closure for its intended storage orientation and operating conditions. During cleaning, inspect both flat faces and remove residue from the lid recess. If the gasket repeatedly slips out of place, review the retaining fit and closing movement rather than using greater lid force to hold a displaced ring.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. If the gasket repeatedly slips out of place, review the retaining fit and closing movement rather than using greater lid force to hold a displaced ring.

Custom dimensions

Define the supported width and section thickness using the actual sealing land.

Fit & assembly

A silicone gasket for jar lids should stay in its intended position while the lid is placed or turned into closure.

Use & inspection

During cleaning, inspect both flat faces and remove residue from the lid recess.

Photos illustrate structure or material only. The ring's flexibility can help it follow the seat, but excessive stretch or a loose retaining arrangement may let it shift. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.