Air bag arrangement with gas filtration

An air bag arrangement for use with composite propellant, comprising:

• a gas generator to which is connected an air bag, said gas generator having a combustion chamber for composite propellant, wherein wall means of said combustion chamber are provided with discharge openings;
• first filter means disposed in a housing of said gas generator for receiving via said discharge openings gas generated in said combustion chamber;
• and
• second filter means disposed beyond said housing of said gas generator and surrounding same at a distance therefrom to thereby provide an empty space between said housing of said gas generator and said second filter means to form a cooling and pressure reduction zone for a gas stream from said first filter means, wherein said second filter means serves to separate out gaseous and liquid impurities resulting in said gas stream during combustion of said propellant in said combustion chamber, wherein said reduction zone serves, by reducing the temperature level of said gas stream, and by reducing the pressure level of said gas stream to within the range of atmospheric pressure, to effect a phase change of said gaseous and liquid impurities, whereby liquid and solid impurities are filtered out in said second filter means and wherein said gas stream enters said air bag from said second filter means.