When inserting glass tubing into a rubber hose or stopper, which substance should be avoided for lubrication?

The use of lubrication when inserting glass tubing into a rubber hose or stopper is important for preventing damage and ensuring a smooth fit. Oil should be avoided as a lubricant because it can degrade rubber and create a potentially unsafe situation. When oil penetrates the rubber, it can lead to deterioration of the material, making it more prone to failure or breakage. This failure can be dangerous when handling glass, as it increases the risk of shattering.

In contrast, substances like water, alcohol, and vinegar tend to be safer choices for lubrication with rubber, as they do not typically degrade rubber materials and are less likely to cause adverse chemical reactions. Therefore, selecting the right lubricant is crucial for maintaining the integrity of the equipment and ensuring safety during usage.