Also Called: Dichlorofluoromethane; Dichlorofluoromethane (FC-21); Dichlorofluoromethane [FC-21];Dichlorofluoromethane (Hcfc-21);Methane, dichlorofluoro-;HCFC-21;(HCFC‑21);Dichloromonofluoromethane-Methane, dichlorofluoro-;CHFCL2 (HCFC-21);DICHLOR-FLUOR-METHAN;FLUOROCARBON 21 (SEE DICHLOROFLUOROMETHANE);DICHLOROMONOFLUOROMETHANE;เอชซีเอฟซี-21;DICHLOROMONOFLUOROMETHANE (FC 21);FREON 21;ジクロロフルオロメタン【HCFC-21】;dichlórfluórmetán;二氯一氟甲烷;DICLOROFLUOROMETANO;FLUOROCARBON 21