Pure trinitrophenol is a solid substance in the form of plate-like colorless or yellowish crystals. It has density 1813 kg/m³, the melting point of 122.5 °C. The crystalline system is orthorhombic bipyramidal. Vapor pressure at 195 °C is 2 mm Hg; at 255 °C - 50 mm Hg. Art. The melt density at 124 °C is 1589 kg/m³, at 170 ° C - 1513 kg/m³. Gravimetric (bulk density) of the powder is 900-1000 kg/m³. The powder is well pressed, especially when heated. With a pressing pressure of 4,500 kg/cm², the density is 1740 kg/m³, but in practice, for safety reasons, it is compressed at pressures up to 2000 kg/cm², with a density not exceeding 1630 kg/m³. With a mild cooling of the melt, it is possible to obtain a solid with a density of 1580-1610 kg/m³.