English to French Tech/Engineering Patents in a patent

gas from the operating chamber (1) is being vacuumed until gas pressure in the operating chamber (1) is not higher than 10~5 Pa,

in the first step a pressure of the press (11) corresponding to pressure on the powder (5) within the range of 2 MPa
to 15 MPa is applied, while the values of pulse current, pulse duty cycle and repetition frequency are chosen such that the temperature of the powder was constantly in the range of 0.05 to 0.3 of melting temperature of the powder, while gas is constantly vacuumed and gas pressure is constantly measured,

is being vacuumed = est aspiré/est en train d'etre aspiré?