Purity Size Appearance Humidity Arsenic Copper Lead Mercury Insolubility in water Total hardness Hardness of Calcium Hardness of Magnesium Total iron Alkaline Sulfate PH Additives Storing TABLET SALT SPECIFICATIONS %m/m NaCl 99.5 Inch / (cm) 1”x1” / (2.5cm x 2.5cm) Fine white , crystalline struture % m/m 0.02 – 0.025 mgAs/kg 0-­‐0.1 mgCu/kg <0-­‐2 mgPb/kg <0-­‐2 mgHg/kg <0-­‐0.1<0-­‐0.1 %m/m 0.02-­‐0.1 d°H 0.5-­‐0.1,2 d°H 0.3-­‐0.7 d°H 0.2-­‐0.5 mgFe/kg mgCaCO3/kg mgSO4/kg %20 m/v Dehumidifying material Should be kept in dry place 0-­‐0.3 0-­‐5 25-­‐100 5.5±1.0