High-temperature-resistant glass jar with rubber seal gasket

Rubber seals for glass jars work between each closure and its receiving rim. Each gasket profile must match the jar's sealing arrangement so the lid applies contact where intended. An approximate ring can make the closure feel tight while leaving uneven contact around the opening.

Select the gasket material for the intended contents and cleaning conditions. High-temperature suitability must be established for the complete jar, lid and gasket arrangement, rather than inferred from one rubber component. The gasket does not independently make an ordinary glass jar suitable for a particular heating or preservation process.

Inspect the rim and lid seat for residue before closing the container. Keep the gasket in its intended channel without a twist or folded section. Follow the finished container's care requirements when removing and cleaning the seal. If the ring becomes stretched, torn or difficult to seat, use a compatible replacement instead of forcing the lid closed against a gasket that no longer follows the original profile.

Material options

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

Hardness selection

Rubber: 30–90 Shore A. Select ring compliance with the container rim and lid paired together, comparing compression around the complete opening rather than closure feel alone.

Custom dimensions

An approximate ring can make the closure feel tight while leaving uneven contact around the opening.

Fit & assembly

A rubber seal gasket for a glass jar works between the closure and its receiving rim.

Use & inspection

Inspect the rim and lid seat for residue before closing the container.

Photos illustrate structure or material only. An approximate ring can make the closure feel tight while leaving uneven contact around the opening. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.