Details

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R134a is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC refrigerant. With the discovery of the damaging effect of CFCs and HCFCs refrigerants to the ozone layer, the HFC family of refrigerant has been widely used as their replacement.

It is now being used as a replacement for R-12 CFC refrigerant in the area of centrifugal, rotary screw, scroll and reciprocating compresssors. It is safe for normal handling as it is non-toxic, non-flammable and non-corrosive and primarily use as a "high-temperature" refrigerant for domestic refrigeration and automobile air conditioners. 
 

Properties
Chemical formula	C2H2F4
Molar mass	102.032 g·mol−1
Appearance	Colorless gas
Density	0.00425 g/cm3, gas
Melting point	−103.3 °C (−153.9 °F; 169.8 K)
Boiling point	−26.3 °C (−15.3 °F; 246.8 K)
Solubility in water	0.15 wt%
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Asphyxiant
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H280
Precautionary statements	P410+P403
NFPA 704 (fire diamond)
Flash point	250 °C (482 °F; 523 K)
Related compounds
Related refrigerants	Difluoromethane Pentafluoroethane
Related compounds	1-Chloro-1,2,2,2-tetrafluoroethane 1,1,1-Trichloroethane

Sources;
https://en.wikipedia.org/wiki/1,1,1,2-Tetrafluoroethane
https://www.airconditioning-systems.com/R134a.html