Very low temperature refrigeration systems typically operate in two or more stages (cascade type systems). It would be nearly impossible to achieve low temperatures in a single stage with an inexpensive compressor. The traditional cascade system has a low temperature stage which uses the lower boiling point gas, such as R-13 or R-503, and a high stage which typically uses R-12, R-22, or R-502. The high stage evaporator provides the correct condensation temperature for the low stage so that compressors in both stages can run at "normal" pressures.

Part NumberDescription
5R5035 LB. CYLINDER
9R5039 LB. RETURNABLE CYL.
20R50320 LB. RETURNABLE CYL.
80R50380 LB. RETURNABLE CYL.

 

Download SDS for R-503.

Download the R-503 product information
from the NRI Refrigerant Reference Guide