Why is there a hole in the bottom of high borosilicate double wall glass？
The small hole at the bottom of a double-walled glass made of high borosilicate glass serves a specific and vital purpose. These glasses typically consist of two glass layers with a small space in between, which is used to provide thermal insulation, as air is a poor conductor of heat, thus slowing down the transfer of heat.
However, this double-layer structure introduces a potential issue, which is related to changes in air pressure. At different temperatures, the gas between the inner and outer layers can expand or contract, leading to minor pressure differentials. Without proper management, these pressure differentials can result in problems such as the two glass layers sticking together or even cause deformation of the glass.
To address this concern, manufacturers usually incorporate a small hole in the bottom of the glass. The purpose of this hole is to allow for the equalization of air pressure between the interior and exterior of the glass. Specifically, when pressure differentials occur, the hole enables the gas to flow, thus maintaining equilibrium in air pressure between the inner and outer layers. This not only prevents issues like sticking and deformation but also ensures the glass’s performance and durability.
Therefore, the small hole in a double-walled high borosilicate glass plays a crucial role in ensuring the equilibrium of air pressure between the interior and exterior layers, reducing potential problems, and preserving the glass’s performance and appearance. This is done to make your glass more durable and to ensure it functions as intended during use.