decompression, steamed amount, upright stability, actual capacity verification! ● Generally, flat -bottom flasks are not suitable for reduced pressure because the bottom is applied to the bottom compared to the round bottom. This product has confirmed that it can withstand 190 PA 30 minutes. ● It has been confirmed that the amount of evaporation is within 10 % of the difference from the existing flask. (Evaptrator reduced pressure test, solvent: ethanol) ● The optimal bottom area is determined for each capacity in consideration of the impact and stability of the evaporation amount.