For vacuum distillation, a specific type of vacuum grease that can withstand high temperatures and maintain its properties in a vacuum environment should be used. Commonly recommended types include:
1. **Silicone Grease**: This is often used due to its stability and versatility. It can handle a range of temperatures and has good insulating properties.
2. **PTFE (Teflon) Grease**: Provides excellent chemical resistance and can withstand both