The results which were obtained for temperatures ranging from 213 to 713C, and differential H pressures of 0.3 to 180torr, could be represented by:

P (cm mm/h atm½) = 5.45 x 102exp [-15040/RT]

Hydrogen Permeability of Haynes Alloy-188. E.H.Van Deventer: Journal of Nuclear Materials, 1977, 66[3], 325-8