R-508B — Trifluoromethane/Hexafluoroethane azeotrope

Azeotropic blend (R23/R116) for ultra-low-temperature cascade systems — the standard for -80°C medical freezers. The engine resolves it live in a verified window around -50/-10 °C; CoolProp's mixture model does not converge at the coldest -80 °C states, so use R-1150 (the modern replacement) for those.

COP (η=0.7)

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Capacity (0.1 kg/s)

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Discharge temp

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GWP

13396

Physical properties

Critical temperature14.0°C

Critical pressure3.9 MPa

Normal boiling point-87.4°C

Safety classA1

ODP0

CoolProp supportlimited

Typical applications

Ultra-Low Temperature

Cascade Low-Temperature Stage

Auto-Cascade

Medical Freezers (-80°C)

Run this fluid at your own operating conditions — the standard cycle loads it in one click.