Montreal Protocol – Annex B: Controlled substances Annex B: Controlled substances Group Substance Ozone-Depleting Potential Group I CF3Cl (CFC‑13) 1.0 C2FCl5 (CFC‑111) 1.0 C2F2Cl4 (CFC‑112) 1.0 C3FCl7 (CFC‑211) 1.0 C3F2Cl6 (CFC‑212) 1.0 C3F3Cl5 (CFC‑213) 1.0 C3F4Cl4 (CFC‑214) 1.0 C3F5Cl3 (CFC‑215) 1.0 C3F6Cl2 (CFC‑216) 1.0 C3F7Cl (CFC‑217) 1.0 Group II CCl4 carbon tetrachloride 1.1 Group III C2H3Cl3* 1,1,1-trichloroethane* (methyl chloroform) 0.1 * This formula does not refer to 1,1,2-trichloroethane.