Table 4.

Permeation properties of the Matrimid HFs treated with Protocol #1. Temperature (T) = 25 °C.

Membrane	Permeance (GPU)						Selectivity
	H2	He	CO2	O2	CH4	N2	CO2/N2	H2/N2
M1	40.0	33.5	13.3	3.35	0.44	0.53	25.1	75.5
M2	47.0	40.0	21.9	4.0	0.54	0.63	34.8	74.6
M3	41.6	37.0	17.0	3.6	0.52	0.58	29.3	71.7

GPU: Gas Permeance Unit. 1 GPU = 10⁻⁶ cm³·cm⁻²·s⁻¹·cmHg⁻¹