... such as high free volume, low pressure drop, low mass-transfer unit height, high flooding point, uniform gas-liquid contact, small ... specific gravity, high mass transfer efficiency and so on, and the application temperature in media ... m²/m³)Free volume (%)Dg5050*5080006510193Dg7676*763420565594Dg100100*1001850487595Note: The above data are reference to material PP.