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Table 1 DRH of relevant salts at various temperatures

From: Saturated salt solutions in showcases: humidity control and pollutant absorption

Chemical name Formula 15 °C 20 °C 25 °C
Calcium chloride hexahydrate CaCl2‧6H2O 28.1% 30.9% 34.1%
Magnesium chloride hexahydrate MgCl2‧6H2O 33.3% 33.1% 32.8%
Potassium carbonate K2CO3 43.2% 43.2% 43.2%
Magnesium nitrate hexahydrate Mg(NO3)2‧6H2O 55.9% 54.4% 52.9%
Calcium nitrate tetrahydrate Ca(NO3)2‧4H2O 56.9% 53.7% 50.7%
  1. Data taken from Greenspan [14], for the calcium salts calculated from Wexler [15]