Out of the above substances, hydrofluorocarbons (HFCs) are used in the making of:  1. Aerosols HFCs were historically used as propellants in aerosol cans, but their use is being phased out due to environmental concerns. 2. Foam agents Some types of fire-fighting foam agents use HFCs. 3. Fire retardant HFCs can be a component in some fire retardant formulations. 4. Lubricants typically do not contain HFCs. They use different chemical formulations to achieve lubricating properties.