How does high heat affect the performance of cork (including synthetic) stoppers after bottling?Updated 21 days ago

Unusual exposure to heat can affect the performance of sealed bottles in two main ways:

1. Pressure build-up inside the bottle: High (non-standard) ambient heat levels will increase pressure within the bottle, potentially causing the stopper to lift, if not addressed in advance with correct bottle and stopper design. Of primary importance is that the fill level is correct and the head space (or ullage) in the bottle is appropriate. The less head space, the more likely there is to be an issue. If it is expected that the bottle will be exposed to abnormally high temperatures, the stopper can be designed in such a way that aids in mitigating the issue.

2. Cap adhesion issues due to melting glue: When wood or plastic caps are glued onto cork or synthetic stoppers, high heat exposure can melt the adhesive typically used, causing the caps to detach. This can occur when bottles are sealed (dipped) with extremely hot wax. To prevent this, an adhesive specifically designed for high-temperature resistance should be requested prior to stopper production.