HP has eliminated all manufacturing process uses of chlorofluorocarbons (CFCs), HBFCs, halons, 1,1,1 trichloroethane (TCA), carbon tetrachloride and methyl bromide. We require suppliers to avoid using these chemicals in manufacturing processes. Some ozone-depleting substances (ODS) are used in air-conditioning systems and halon fire extinguishers, but HP is in the process of replacing these chemicals with safer substitutes.