16.12 Glass Under Vacuum

Reduced pressure

Some general guidelines for glass under vacuum include:

Inspect glassware that will be used for reduced pressure to make sure there are no defects such as chips or cracks that may compromise its integrity.
Only glassware that is approved for low pressure should be used. Never use a flat bottom flask (unless it is a heavy walled filter flask) or other thin walled flask that are not appropriate to handle low pressure.
Use a shield between the user and any glass under vacuum or wrap the glass with tape to contain any glass in the event of an implosion.

Cold traps should be used to prevent pump oil from being contaminated which can create a hazardous waste.
Pump exhaust should be vented into a hood when possible.
Ensure all belts and other moving parts are properly guarded.
Whenever working on or servicing vacuum pumps, be sure to follow appropriate lock-out procedures.