Euro Refrigerant R‑507 (HFC‑125 / HFC‑143a Azeotrope)

Description

Euro R‑507 is formulated as a stable, azeotropic pair of R‑125 and R‑143a (50/50 by weight). It offers consistent, predictable performance even after minor leaks because its composition does not change with phase transitions. It’s designed to replace R‑502 in display cases, blast freezers, and cold storage.

Key Features:

• Zero ozone depletion potential (ODP = 0)

• ASHRAE safety class A1: nonflammable and low toxicity

• Azeotropic behavior ensures no temperature glide during evaporation or condensation

• Maintains performance through multiple charge/recharge cycles 

Specifications:

• Composition: 50% R‑125 / 50% R‑143a

• GWP (100‑yr): ≈ 3,900–3,922 

• Boiling point: –46.7 °C 

• Critical temperature: ≈ 70.9 °C; critical pressure: ≈ 37.9 bar (550 psia) 

• Recommended lubricant: POE oil only (incompatible with mineral oil/AB) 

Applications:

• Supermarket display cases, ice cream freezers

• Blast freezing, transport refrigeration

• Walk-in units

• Flooded evaporator systems

Usage:

• Must always be charged in liquid form to preserve azeotrope integrity

• Replace mineral or alkylbenzene oils with POE before retrofit from R‑502

• Follow recovery protocols, ensure ventilation, and prevent over-pressurization

 FAQs:

1. Can R‑507 replace R‑502 in existing systems?
   Yes—requires lubricant swap to POE and proper charge, but minimal hardware modifications are typically needed

2. Why doesn’t it exhibit glide?
   Because it’s an azeotropic blend, meaning its phase change occurs at a single uniform temperature, unlike zeotropic blends 

3. Is it eco-friendly?
   It has zero ozone depletion potential but a high GWP (~3,900), so strict leak control is advised.