Freon™ MO99™ (R-438A) — Wholesale HFC Refrigerant

HFC refrigerant blend designed for retrofitting R-22 systems. Non-ozone depleting with excellent thermodynamic properties.

Freon™ MO99™ (R‑438A) – Advanced HFC Retrofit Refrigerant

Delivering a seamless, high-performance drop-in solution, Freon™ MO99™ (R‑438A) is engineered to replace R‑22 systems while maintaining efficiency and requiring no oil change.

🌱 Key Benefits & Features

Zeotropic HFC Blend; Zero Ozone Impact

Composed of R‑32, R‑125, R‑134a, R‑600, and R‑601a, Freon™ MO99™ is a non-ozone-depleting alternative with similar thermodynamics to R-22

True Drop-In Compatibility

Designed for direct expansion (DX) systems—Rooftops, chillers, split units, and more—without needing expansion valve or line-set modifications

Oil-Change-Free Retrofit

Fully compatible with mineral oil (MO), polyester (POE), and alkylbenzene (AB), and typically does not require lubricant conversion

Lower Discharge Temperatures

Extends compressor life and enhances performance thanks to cooler operation

42% Lower GWP vs. R‑404A

Offers strong environmental performance compared to other HFC options

Top-Up Capable Post-Retrofit

Allows easy charging after minor leaks without full system recovery

Freon

Docslib

🔧 Technical Specifications

Property Value

Blend Composition R‑32 (8.5%), R‑125 (45%), R‑134a (44.2%), R‑600 (1.7%), R‑601a (0.6%)

Boiling Point –42.3 °C

Temperature Glide ~6.25 K (≈11 °F)

Critical Temp / Pressure ≈83.7 °C / 42.16 bar

Saturated Liquid Density ~1180 kg/m³ at 25 °C

Safety Classification ASHRAE A1 – non-toxic, non-flammable

FSW

GWP (IPCC AR4) 2,265

National Refrigerants Ltd

🎯 Ideal Applications

Residential & Commercial A/C: Rooftops, chillers, split systems

DX Refrigeration: Supermarkets, walk-in coolers, condensing units

Non-Flooded Systems, Not for Flooded Centrifugal Units

✅ Why Choose MO99?

Direct R‑22 Replacement – identical controls, similar cooling capacity, lower discharge temps

Zero Ozone Depletion – ideal for regulatory compliance and eco-conscious operations

In-depth Refrigerators Reviews

Cost & Time Savings – no oil or expansion device changes; easy top-off

Widely Approved & Supported – long-standing Chemours innovation, global retrofit leader