Chemistry informtion about Chlorotetrafluoroethane (CAS NO.63938-10-3) is:
IUPAC Name: 2-Chloro-1,1,1,2-Tetrafluoroethane
Synonyms: Chlorotetrafluoroethane ; Monochlorotetrafiuoroethane ; Monochlorotetrafluoroethane ; EINECS 264-567-8 ; Hydrochlorofluorocarbon-124 (HCFC-124, R-124)
MF: C₂HClF₄
MW: 136.4759528
EINECS: 264-567-8 
Density: 1.434 g/cm3
Enthalpy of Vaporization: 22.98 kJ/mol
Vapour Pressure: 2640 mmHg at 25°C
Following is the molecular structure of Chlorotetrafluoroethane (CAS NO.63938-10-3) is:

 

 Chlorotetrafluoroethane (CAS NO.63938-10-3) is a hydrochlorofluorocarbon used as a refrigerant.

Probably acts as a simple asphyxiant. See also CHLORINATED HYDROCARBONS, ALIPHATIC; and FLUORIDES. When heated to decomposition it emits highly toxic fumes of F⁻ and Cl⁻.

 Chlorotetrafluoroethane (CAS NO.63938-10-3) is a colorless odorless gas. It is shipped as a liquefied gas under its own vapor pressure. It can asphyxiate by the displacement of air. Contact with the liquid can cause frostbite. Exposure of the container to prolonged heat or fire can cause it to rupture violently and rocket. It is chemically inert in many situations, but can react violently with strong reducing agents such as the very active metals and the active metals. Can react with strong oxidizing agents or weaker oxidizing agents under extremes of temperature. About health jazard, Displaces air such that oxygen content may become too low to support life. Prolonged exposure can cause narcotic effect or rapid suffocation. Contact with liquid may cause frostbite.
Fire Hazard Some may burn but none ignite readily. Containers may explode when heated. Ruptured cylinders may rocket.