A method for capturing halocarbon from a gas, the method comprising processing gas containing halocarbon with material which is undamaged by exposure to supercritical fluid. A method for reclaiming halocarbon from a material, the method comprising exposing the material to a supercritical fluid.A module for processing a gas containing halocarbon, the module comprising material for capturing halocarbon from a gas, wherein the module is arranged to withstand supercritical fluid.