Harp 134a is designed to meet the needs of many air conditioning and medium temperature refrigeration systems. Harp 134a is a single component refrigerant, rated A1 by ASHRAE (lowest levels of toxicity and flammability). Harp 134a has zero ozone depletion potential and a Global Warming Potential of 1430. DISCLAIMER Meets ARI 700 and SAE J2776 Purity Standards *Consult you Owner's Manual for Correct Viscosity Grade. HARP 134A ASHRAE Number : R134a CAS Number : 811-97-2 Chemical Name : 1,1,1,2-tetrafluoroethane Chemical Formula : CH2FCF3 Refrigerants SIZE : 12 OZ. Can