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Thiourea is a colourless/white and odourless organic solid. According to Ullmann's Encyclopedia thiourea has no sharp melting point, as it rearranges relatively rapidly to NH4SCN from 135°C on. The substance has a relative density of 1.405 g/cm³ at 20 °C. It decomposes before boiling. The substance as manufactured has a median particle size of 482.96 µm, with approximately 90 % of the mass smaller than 808.65 µm. The vapour pressure of thiourea is negligibly low (9.975E-08 hPa at 20 °C). Thiourea is a hydrophilic compound (log Kow -0.92) and is very soluble in water (137 g/L at 20 °C); as such, the solubility in organic solvents/fat is not considered a relevant property of this substance as it will essentially be insoluble in non-polar solvents. Thiourea has a surface tension of 65.4 mN/m at 20 °C. Thiourea is not highly flammable.