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2,4 -dinitrophenol is a solid organic substance, with yellow colour and sweetish odour. It can be manufacture as platelets, leaflets or crystals

(The Merk Index, 1989).

It has a density of 1.683 g/cm^3 , a vapour pressure of 1.49 x 10 ^-5 mmHg at 18°C (Mabey WR, Smith JH, Podoll RT, et al., 1981), and it is soluble in water (5600 mg/L at 18°C and 2790 at 20°C from Schwarzernbach, RP., et al, 1988).

It shows solubility on different types of solvent (g/100 g solvent): 15.55 in ethyl acetate; 35.90 in acetone, 5.39 in chloroform; 20.05 in pyridine; 0.423 in carbon tetrachloride; 6.36 in toluene; it is soluble in alcohol and benzene (The Merk Index, 1989).

Its melting point is defined in the range of 112 -114°C and the boiling point cannot be defined because it sublimes when carefully heated (The Merk Index, 1989).

The substance in its pasty form, which is the only one marketed, with a water content > 15% is considered not explosive, but as a solid desensitised explosive. For this reason this wetted form permits to suppress its explosive properties (solid desensitised explosive)

2,4 -dinitrophenol has a dissociation constant of 4.09 (temperature not specified) and appear to be stable in acid solution (Pearce PJ, Simkins RJJ., 1968).

Its octanol-water partition coefficient Log Kow is 1.54, that suggest that 2,4 -dinitrophenol has a low ability to bioaccumulation in aquatic organisms.