Mixed refrigerant R404a is a colorless gas under ordinary temperatures,it's a long-term substitute for R502

 mixed refrigerant R404a,

Characteristics&purposes: R404a is a colorless gas under ordinary temperatures, and a colorless&transparent liquid under the pressure of itself, mix by HFC-125, HFC-134a and HFC-143. And it's a long-term substitute for R502, mainly used in refrigerating systems of low & moderate temperature.