The adsorption isotherms for halogenated hydrocarbons such as methylene chloride and Freon-12 on five kinds of adsorbents(two activated carbons, two molecular sieves, and SiO₂)were measured with the BET adsorp-tion and the pressurized adsorption apparatus. The BET multilayer model is shown to fit well the experimental adsorp-tion isotherms. The adsorption capacity is in the order of S-AC>K-AC>MS-13X>SiO₂>MS-5A at the smae equilibrium adsorption pressure. Enthalpy of adsorption which is estimated from the constant C of BET multilayer model semms to be related to the reversibility of adsorption and the strength of adsorption. Activated carbons used seems to be the best adsorbent among the other ones, comparing with the terms of the adsorption capacity and the adsorption strength.