High quality heat-resistant silicone O-ring/washer for bottles

A silicone O-ring or washer for bottles should fit the sealing feature of the selected bottle and closure. A round-section ring and a flat washer require different seating geometry, so the intended profile must be defined before the dimensions are chosen. The custom component is developed around that complete closure.

Review where sealing contact occurs as the cap or other closure reaches its intended position. The rubber should remain supported and correctly located rather than roll out of a groove or bunch beneath the closing surface. The inner opening must also leave the required bottle passage clear. Evaluate repeated opening and closing with the actual mating parts.

Material selection should reflect the contents, contact duration, and any cleaning or heat treatment used with the bottle. Silicone alone does not establish suitability for every content or processing method. The finished closure needs assessment under those conditions.

Keep the seal and its seat free of residue before reassembly. If a removable ring is taken out for cleaning, return it without twist or a trapped edge. Replace a cut or permanently distorted part with the specified profile. Substituting a flat washer for a ring, or changing thickness to tighten a loose cap, can alter the intended sealing arrangement.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. The rubber should remain supported and correctly located rather than roll out of a groove or bunch beneath the closing surface.

Custom dimensions

A round-section ring and a flat washer require different seating geometry, so the intended profile must be defined before the dimensions are chosen.

Fit & assembly

A silicone O-ring or washer for bottles should fit the sealing feature of the selected bottle and closure.

Use & inspection

If a removable ring is taken out for cleaning, return it without twist or a trapped edge.

Photos illustrate structure or material only. A round-section ring and a flat washer require different seating geometry, so the intended profile must be defined before the dimensions are chosen. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.