Essentially RS-52 is similar to R507 in its performance, has similar pressures & is near azeotropic with a glide of <1oC. RS-52 has been designed as a replacement for R502 and the interim ozone depleting blends (eg R402A, R408A, R403B etc), but is also an excellent replacement for R22 at low temperatures where the system is designed to withstand R502 pressures. Also replaces R402A (HP80), R402B (HP81), R403B (69L), R408A (FX10) & R411B.
"RS" Series Of Drop-In Zero Odp Refrigerants The "RS" series of refrigerants are non ozone depleting and can be used both with traditional (excluding RS-50, see below) lubricants (eg mineral and alkyl benzene oils) and the new synthetic lubricants such as polyol esters. They provide a simple and low cost method of switching away from CFCs and HCFCs including the interim ozone depleting blends. RS-50 is a new low GWP alternative to R404A and R507.