White microcrystalline solid or light brown solid. Starts to darken in color (decompose) at approximately 437° F; continues to darken until the melting point (525° F) at which temperature 2-methylbenzene-1,3-diamine dihydrochloride is a very dark brown liquid .
2-methylbenzene-1,3-diamine dihydrochloride behaves as a weak organic acid. Materials in this group are generally soluble in water. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible.
ACUTE/CHRONIC HAZARDS: When heated to decomposition 2-methylbenzene-1,3-diamine dihydrochloride emits very toxic fumes of NOx and hydrogen chloride.
Flash point data for 2-methylbenzene-1,3-diamine dihydrochloride are not available; however, 2-methylbenzene-1,3-diamine dihydrochloride is probably combustible.
