Respuesta :
The moment to apply grease to the joints while dealing with many ground glass joints in a setup is when the reaction is claimed to be at a heated point that is over 150° C, or when the joints are still spun if in use.
Ground glass joints are not fully airtight, despite being engineered to fit together rather well. In some situations, each joint has to have grease added to it in order to provide a tight seal (such as when employing lower pressure inside equipment).
It should be noted that ground or frosted glass is widely employed in ambient lighting as a heat- and weather-resistant light diffuser, notably on the glass covers or enclosures for lamp fixtures and on incandescent bulbs on occasion.
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