Saturated Salt Solutions - Controlling Air Humidity

Saturated salt/water solutions can be used to maintain particular values of relative humidities inside sealed containers. This tool provides reference data for various saturated salt solutions and their relative humidity values at different temperatures, useful for calibrating humidity sensors.

Saturated Salt Solution	Temperature (°C): 5	Temperature (°C): 10	Temperature (°C): 15	Temperature (°C): 20	Temperature (°C): 25	Temperature (°C): 30	Temperature (°C): 35	Temperature (°C): 40	Temperature (°C): 50	Temperature (°C): 60
Ammonium nitrate (NH4NO3)
Relative Humidity (%)	75	70	67	64	60	53
Ammonium sulphate ((NH4)2SO4)
Relative Humidity (%)	82	82	82	82	81	81	81	80	80	79
Lithium chloride (LiCl)
Relative Humidity (%)		11.31	11.35	11.28	11.25	11.21	11.10	10.95
Magnesium chloride (MgCl2)
Relative Humidity (%)	34	34	33	33	33	33	32	32	32	31
Magnesium nitrate (Mg(NO3)2)
Relative Humidity (%)	60	59	57	56	54	53	51	50	48	45
Sodium Chloride (NaCl)
Relative Humidity (%)	75.51	75.65	75.67	75.61	75.47	75.29	75.09	74.87
Potassium sulphate (K2SO4)
Relative Humidity (%)	99	98	98	98	98	97	97	97	96	96
Potassium nitrate (KNO3)
Relative Humidity (%)	96	96	96	95	95	94	92	91	89	85
Potassium chloride (KCl)
Relative Humidity (%)	89	88	87	86	85	84	84	83	82	81
Potassium acetate (CH3CO2K)
Relative Humidity (%)		23	23	23	23	22
Potassium hydroxide (KOH)
Relative Humidity (%)		14	12	11	9	8	7	7	6	6
Sodium chloride (NaCl)
Relative Humidity (%)	76	76	76	76	75	75	75	75	75	74
Sodium nitrite (NaNO2)
Relative Humidity (%)		65	64	63	62	61
Sodium dichromate (Na2Cr2O7)
Relative Humidity (%)	61	59	57	57	55	54	53	51	50	49