Table 3.

Pure gas permeability on neat Pebax^® 1657 and Pebax^® 1657/Polysorbate dense membranes.

Membrane	Additive (wt %)	Permeability (Barrer)
		H2	He	O2	N2	CH4	CO2
Neat Pebax	0	6.46	3.92	2.85	1.15	3.41	66.5
T20	15	8.28	5.21	3.92	1.55	5.50	86.7
	35	12.2	8.50	5.67	2.27	7.71	123
	50	16.7	10.3	8.18	2.84	10.2	144
T80	15	8.94	6.12	4.18	1.59	5.60	90.2
	35	14.6	9.24	7.95	3.13	10.0	149
	50	17.4	10.4	8.76	3.49	12.1	167

1 Barrer = 10⁻¹⁰ cm³ (STP) cm cm⁻² cmHg⁻¹ s^−1.