The eutectic Na₂CO₃–NaCl salt has different thermal stability properties under various operation environments. The salt shows more thermal and chemical stability without weight loss in a CO₂ atmosphere up to 700 °C as compared with a N₂ atmosphere where there was 0.15% weight loss.

The Na₂CO₃–NaCl salt shows good thermal properties and stability after 50 and 100 thermal cycles. Thus the salt is promising as a high temperature PCM for CSP application, if used in a CO₂ environment or it is encapsulated.