Refer to chlorine room in the bottom left of base.
The average gas pressure in the room is 1862g of chlorine gas, and no off-gassing of slime occurs in normal gameplay (cycle 501 > 507).
However, a reload of my save file causes the slime to off-gas immediately upon unpausing.
Cycle 501 is before chlorine room is filled with slime to verify gas pressure, cycle 507 is where the off-gassing was found (although slime off-gassing was also found on reload of the saves of the cycles in between).
The Breathless Moonbase Cycle 501.sav
The Breathless Moonbase Cycle 507.sav