The gas-transport properties of one of a family of well-known adhesives, Loctite 350(R), were studied. Permeability, solubility, and diffusivity coefficients, together with the activation energies of diffusion and permeation and the solution enthalpy, were determined from 20 to 40 degreesC for oxygen, nitrogen, carbon dioxide, and methane. Loctite 350(R) showed relatively high permselectivity and permeability for the gas pairs O-2/N-2 and CO2/CH4, especially for the former. The possibility of preparing very thin layers on various kinds of supports from these photocurable polymers makes them promising materials for gas-separation devices. (C) 2001 John Wiley & Sons, Inc.