CELMET improves propellant efficiency by, when the propellant is blasted, retaining the liquid propellant in CELMET pores in the tank, and only releasing the vaporized portion of the propellant.
CELMET retains liquid propellant, minimizing the sloshing (content motion caused by swinging of the liquid container) that affects the attitude of the spacecraft.
To achieve continuous blasting, all the propellant must be heated by the heater. CELMET, with its high thermal conductivity, transfers heat efficiently and facilitates propellant vaporization.
A rapid drop in tank pressure during propellant blasting may cause sudden boiling of the propellant. CELMET is effective in preventing this, since its structure is similar to that of boiling chips.