R-410A is a blend of two refrigerants. R-410A is a composition
made of 50 HFC 125 and 50 HFC 32. Although the
refrigerant is a blend, it is considered to be a near azeolropic
type refrigerant. Near azeotropic refrigerants behave very similar
to a refrigerant such as R-22. A near azeotropic refrigerant
does not fractionate 'significantly when a small leak occurs.
Because the blend is near azeotropic, subcooling glide is
insignificant. These characteristics make R-410 a very stable
refrigerant to work with.