Buy RS-50 Refrigerant (R442A) | R404A & R507 Replacement | 25 lb — Refrigerant Inc

RS-50 Refrigerant (R442A) — Low-GWP R404A & R507 Replacement for Low-Temperature Refrigeration

RS-50, officially designated R442A by ASHRAE, is a refrigerant blend developed by Comstar International as a lower-GWP replacement for R404A and R507 in low-temperature commercial refrigeration applications. With a GWP significantly below both R404A (3,922) and R507 (3,985), RS-50 helps commercial refrigeration operators reduce their environmental footprint while maintaining reliable low-temperature performance. Refrigerant Inc stocks genuine RS-50 in 25 lb cylinders with free shipping to all 48 continental states.

What Systems Use RS-50 (R442A)?

RS-50 is designed for low-temperature commercial refrigeration applications where R404A or R507 is currently in use:

• Supermarket frozen food systems — Low-temperature display cases, reach-in freezers, and multi-deck frozen food cases
• Walk-in freezers — Restaurant, grocery, and food distribution walk-in frozen storage
• Cold storage warehouses — Commercial and industrial frozen storage facilities
• Transport refrigeration — Reefer trailers and refrigerated containers originally running R404A or R507
• Blast freezers — Food processing and food service blast freezing equipment

RS-50 as an R404A / R507 Retrofit

RS-50 is designed to retrofit existing R404A and R507 systems. Key considerations before converting:

• POE oil required — RS-50 requires POE lubricant. Most R404A and R507 systems already use POE — verify before converting. If mineral oil is present, a full oil change is required.
• Recover existing refrigerant first — Fully recover all R404A or R507 before introducing RS-50. Do not mix refrigerants.
• TXV evaluation — Expansion valve adjustment may be needed depending on the system. Refer to Comstar's RS-50 retrofit documentation for guidance.
• Charge weight — RS-50 charge weight may differ slightly from the original R404A or R507 specification. Consult Comstar's retrofit guidelines for your specific application.
• Label the system — After retrofitting, update the equipment label with the new refrigerant type, charge weight, and conversion date.

RS-50 vs. Other R404A Replacements

• RS-50 (R442A) — Comstar's offering for R404A/R507 low-temp replacement; 25 lb cylinder
• R448A (Solstice N40) — Honeywell's leading low-GWP R404A replacement, strong low-temp performance
• R449A (XP40) — Chemours' leading R404A replacement, strong medium-temp performance

All three are solid R404A replacements. RS-50 may be the right choice if you're already working with Comstar products or if your supplier has specified it. Call us at 888-593-7366 if you need help choosing.

Why Buy RS-50 From Refrigerant Inc

• Genuine Comstar Product — Factory-sealed RS-50 by Comstar International.
• Free Shipping to All 48 States — No freight fees added at checkout.
• Same or Next-Day Processing — Orders placed before 2PM EST ship the same day.
• Contractor & Wholesale Pricing — Volume accounts available. Call 888-593-7366.

Shipping Information

RS-50 ships via ground freight to all 48 continental states. Alaska and Hawaii excluded. Most orders ship within 1 business day. Transit time is typically 2–5 business days depending on location.

Frequently Asked Questions

Is RS-50 the same as R442A?
Yes. R442A is the official ASHRAE designation. RS-50 is Comstar's brand name for R442A. They are the same refrigerant.

Can RS-50 replace both R404A and R507?
Yes. RS-50 is approved as a replacement for both R404A and R507 in low-temperature commercial refrigeration applications.

What's the difference between RS-50 and R448A?
Both are lower-GWP replacements for R404A and R507 in low-temperature refrigeration. R448A (Solstice N40) is a Honeywell product with an extensive track record in supermarket retrofits. RS-50 is Comstar's equivalent. Performance is comparable — choice often comes down to supplier preference or equipment manufacturer recommendations.